Cerebral palsy

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Cerebral palsy (CP) is a group of permanent disorders of movement and posture caused by a non-progressive injury or disturbance to the developing brain. The brain injury does not worsen over time, but its functional effects can change as a child grows. CP may also affect speech, swallowing, vision, learning, sensation, and cause epilepsy.

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Definition, causes, and risk factors
Types: spastic, dyskinetic, ataxic, and mixed CP
Clinical features and developmental warning signs
Diagnosis and investigations
Functional classification, including GMFCS
Treatment: physiotherapy, occupational therapy, speech therapy, medicines, orthoses, botulinum toxin, and surgery
Management of associated problems: epilepsy, feeding difficulty, pain, hip displacement, vision/hearing, and learning
Prognosis, prevention, and family support

High-level overview: Spastic CP is the most frequent type and may predominantly affect one side (hemiplegia), both legs more than arms (diplegia), or all four limbs (quadriplegia). Diagnosis is clinical, based on delayed or atypical motor development, abnormal tone and reflexes, and persistent movement patterns. MRI is often used to identify an underlying brain abnormality or exclude an alternative diagnosis.

Care is multidisciplinary and aims to maximize function, participation, comfort, communication, nutrition, and independence. Early rehabilitation and regular surveillance for musculoskeletal complications are central.

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A full cerebral palsy note is best covered one section at a time. Here is the complete map:

Definition and epidemiology
Etiology and risk factors: prenatal, perinatal, and postnatal causes
Classification: spastic, dyskinetic, ataxic, mixed; hemiplegic, diplegic, quadriplegic; GMFCS
Clinical features and developmental red flags
Diagnosis and differential diagnosis
Investigations, including the role of MRI and genetic/metabolic testing
Associated conditions: epilepsy, intellectual disability, speech and feeding problems, vision/hearing issues, pain, hip displacement, scoliosis
Management and rehabilitation: physiotherapy, occupational therapy, speech and feeding support, orthoses, medications, botulinum toxin, selective dorsal rhizotomy, and orthopedic surgery
Prognosis, prevention, and transition to adult care
Exam revision: short notes, tables, and MCQs

Cerebral palsy is lifelong and non-progressive in its underlying brain disturbance, but functional needs and musculoskeletal complications evolve with growth. Current guidance emphasizes coordinated multidisciplinary care that targets both mobility/posture and associated developmental or medical conditions. The NICE under-25 guidance was last reviewed in September 2024.

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Complete exam-ready notes would cover these distinct areas:

Definition and epidemiology
Etiology and risk factors
Classification and GMFCS
Clinical features and developmental red flags
Diagnosis, neuroimaging, and differential diagnosis
Associated comorbidities
Rehabilitation and spasticity management
Orthopedic, neurosurgical, feeding, and medical interventions
Prognosis, prevention, and long-term follow-up
High-yield tables, viva points, and MCQs

Overview: Cerebral palsy is a permanent disorder of movement and posture due to a non-progressive disturbance of the developing fetal or infant brain. The child’s impairments can change with growth, and complications such as contractures, hip displacement, pain, feeding difficulty, epilepsy, and communication or learning problems require periodic assessment. Management is individualized and multidisciplinary.

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Topic map

Definition, causes, and risk factors
Types: spastic, dyskinetic, ataxic, and mixed CP
Clinical features and developmental warning signs
Diagnosis and investigations
Functional classification, including GMFCS
Treatment: physiotherapy, occupational therapy, speech therapy, medicines, orthoses, botulinum toxin, and surgery
Management of associated problems: epilepsy, feeding difficulty, pain, hip displacement, vision/hearing, and learning
Prognosis, prevention, and family support

Which topic would you like in detail: types, clinical features and diagnosis, management, or exam-style notes?A full cerebral palsy note is best covered one section at a time. Here is the complete map:

Definition and epidemiology
Etiology and risk factors: prenatal, perinatal, and postnatal causes
Classification: spastic, dyskinetic, ataxic, mixed; hemiplegic, diplegic, quadriplegic; GMFCS
Clinical features and developmental red flags
Diagnosis and differential diagnosis
Investigations, including the role of MRI and genetic/metabolic testing
Associated conditions: epilepsy, intellectual disability, speech and feeding problems, vision/hearing issues, pain, hip displacement, scoliosis
Management and rehabilitation: physiotherapy, occupational therapy, speech and feeding support, orthoses, medications, botulinum toxin, selective dorsal rhizotomy, and orthopedic surgery
Prognosis, prevention, and transition to adult care
Exam revision: short notes, tables, and MCQs

Choose one number to start with, and I will provide detailed exam-ready notes for that section.Complete exam-ready notes would cover these distinct areas:

Definition and epidemiology
Etiology and risk factors
Classification and GMFCS
Clinical features and developmental red flags
Diagnosis, neuroimaging, and differential diagnosis
Associated comorbidities
Rehabilitation and spasticity management
Orthopedic, neurosurgical, feeding, and medical interventions
Prognosis, prevention, and long-term follow-up
High-yield tables, viva points, and MCQs

Reply with a section number, for example “7” for management, and I will give detailed, exam-ready notes for that section.

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Cerebral Palsy: Exam-Ready Notes

1. Definition and Epidemiology

2. Etiology and Risk Factors

3. Classification and GMFCS

1. Definition and Epidemiology

Definition

Cerebral palsy (CP) is a group of permanent disorders of development of movement and posture, causing activity limitation, that are attributed to non-progressive disturbances occurring in the developing fetal or infant brain.

Key elements of the definition

Permanent: the underlying neurological impairment persists throughout life.
Non-progressive brain lesion: the original brain injury does not progressively worsen.
Clinical manifestations may change: tone, contractures, deformity, gait, pain, and functional limitations can evolve as the child grows.
Causes impairment of:
- Voluntary movement
- Posture and balance
- Motor coordination
- Functional activity

CP commonly coexists with disturbances of:

Sensation and perception
Cognition and learning
Communication and speech
Behavior
Epilepsy
Vision and hearing
Musculoskeletal development
Feeding, swallowing, and nutrition

Important distinction: CP is a clinical description of motor impairment, not a single disease or aetiological diagnosis.

Epidemiology

CP is the most common motor disability of childhood.
Its prevalence is generally about 2 to 3 per 1,000 live births, with variation by region, definition, and survival of preterm infants.
Prevalence is substantially higher in:
- Preterm infants
- Very-low-birth-weight infants
- Multiple pregnancies
- Infants with major neonatal complications
Improved neonatal survival has increased the number of children surviving with neurodevelopmental impairment, though rates of severe CP in some high-income settings have declined with better perinatal care.

Basic epidemiological facts for exams

Spastic CP is the commonest type, accounting for approximately 80% of cases.
CP is more common among boys than girls in many cohorts.
Most cases arise from antenatal or perinatal factors. A relatively smaller proportion is acquired after the neonatal period.

2. Etiology and Risk Factors

Pathogenesis

CP results from abnormal brain development or injury to the immature brain. The timing and location of the brain insult influence the clinical phenotype.

Injury to periventricular white matter in premature infants commonly produces spastic diplegia.
Injury to basal ganglia and thalamus may produce dyskinetic CP.
Injury to the cerebellum may cause ataxic features.
Large hemispheric lesions, such as perinatal arterial stroke, may cause spastic hemiplegia.

Etiological classification by timing

Timing	Examples
Prenatal	Congenital brain malformations, genetic disorders, intrauterine infection, placental dysfunction, fetal stroke
Perinatal/neonatal	Prematurity, periventricular leukomalacia, hypoxic-ischemic encephalopathy, intracranial hemorrhage, neonatal infection, severe jaundice
Postnatal	CNS infection, traumatic brain injury, stroke, severe hypoxia, untreated hypoglycemia or hyperbilirubinemia

A. Prenatal causes and risk factors

1. Prematurity

Prematurity is one of the strongest risk factors.

Mechanisms:

Immature cerebral vasculature
Vulnerable periventricular white matter
Fluctuating cerebral perfusion
Infection/inflammation
Respiratory instability and hypoxia

Periventricular leukomalacia (PVL) is an ischemic injury of white matter around the lateral ventricles. It is especially associated with:

Preterm birth
Spastic diplegic CP
Lower-limb involvement greater than upper-limb involvement

2. Intrauterine infection and inflammation

Examples:

Chorioamnionitis
TORCH infections:
- Toxoplasmosis
- Rubella
- Cytomegalovirus
- Herpes simplex
- Syphilis and other infections

These may cause inflammation, brain malformation, white matter injury, or fetal brain injury.

3. Placental and fetal factors

Placental insufficiency
Fetal growth restriction
Multiple gestation
Placental abruption
Maternal vascular disease
Maternal thrombophilia in selected cases
Fetal stroke

4. Congenital brain abnormalities

Cortical malformations
Schizencephaly
Porencephaly
Hydrocephalus
Genetic and chromosomal disorders

5. Maternal factors

Maternal infection
Severe pre-eclampsia
Diabetes mellitus
Thyroid disease
Exposure to toxins or certain drugs
Severe malnutrition
Trauma
Maternal intellectual disability or epilepsy may be associated with increased risk, depending on underlying cause and exposures.

B. Perinatal and neonatal causes

1. Hypoxic-ischemic encephalopathy (HIE)

Can follow severe interruption of oxygen delivery or cerebral perfusion around birth.

Possible causes:

Placental abruption
Umbilical cord prolapse or compression
Uterine rupture
Severe fetal bradycardia
Severe maternal hemorrhage
Prolonged difficult delivery

Exam point: Birth asphyxia is an important cause but accounts for only a minority of all CP cases. Do not assume that CP is always caused by intrapartum events.

2. Intracranial hemorrhage

Especially in premature infants:

Intraventricular hemorrhage
Periventricular hemorrhagic infarction

May lead to white matter injury, hydrocephalus, and later motor impairment.

3. Neonatal sepsis and meningitis

Bacterial meningitis
Encephalitis
Severe neonatal sepsis

These can cause direct brain injury, infarction, abscess, or diffuse encephalopathy.

4. Severe neonatal hyperbilirubinemia

Unconjugated bilirubin toxicity can cause kernicterus, typically affecting basal ganglia.

Clinical result:

Dyskinetic CP
Dystonia
Choreoathetosis
Sensorineural hearing loss
Upgaze abnormality

5. Metabolic derangements

Severe hypoglycemia
Severe hypernatremia or hyponatremia
Severe hypocalcemia
Severe metabolic acidosis

C. Postnatal causes

Postnatal or acquired CP occurs after the neonatal period, usually from injury to the immature brain.

Causes include:

Meningitis or encephalitis
Traumatic brain injury, including abusive head trauma
Near drowning and severe hypoxic events
Cerebrovascular accident
Severe untreated neonatal or infant hypoglycemia
Severe hyperbilirubinemia
Intracranial tumor or hydrocephalus, if resulting in permanent motor impairment
Severe malnutrition in resource-limited settings

High-yield risk factors

Remember: “Prematurity, infection, ischemia, hemorrhage, malformation, jaundice, and postnatal brain injury.”

Prematurity and low birth weight
Multiple pregnancy
Intrauterine growth restriction
Maternal/fetal infection
Chorioamnionitis
Placental dysfunction
Congenital anomalies
Perinatal stroke
HIE
Neonatal seizures
Intracranial hemorrhage
Neonatal meningitis/sepsis
Severe jaundice
Head injury and CNS infection after birth

3. Classification of Cerebral Palsy

CP is described along three axes:

Predominant motor abnormality
Topographic distribution of limb involvement
Functional severity, commonly using the Gross Motor Function Classification System (GMFCS)

A. Classification by predominant motor type

Type	Main feature	Typical lesion/site	Key clinical features
Spastic CP	Increased tone and velocity-dependent hypertonia	Corticospinal tract/upper motor neuron pathways	Stiffness, hyperreflexia, clonus, contractures
Dyskinetic CP	Involuntary movements and fluctuating tone	Basal ganglia/thalamus	Dystonia, chorea, athetosis, impaired posture
Ataxic CP	Incoordination and balance difficulty	Cerebellar pathways	Broad-based gait, tremor, dysmetria
Mixed CP	Features of more than one type	Diffuse/multifocal injury	Most often spasticity with dystonia

1. Spastic cerebral palsy

Spastic CP is the most common type.

Clinical features

Increased muscle tone
Hyperreflexia
Clonus
Weakness
Reduced selective motor control
Scissoring posture in lower limbs
Equinus or toe-walking
Progressive muscle contractures and bony deformities if untreated

Distribution

a. Spastic hemiplegia or unilateral CP

One side of the body is involved.
Arm is often more affected than leg.
Common cause: perinatal arterial ischemic stroke or unilateral cerebral injury.
Child may show:
- Early hand preference before 12 months
- Fisted hand on affected side
- Circumduction gait
- Equinovarus foot
- Reduced use of affected hand

b. Spastic diplegia or bilateral CP with lower-limb predominance

Both lower limbs affected more than upper limbs.
Classically associated with prematurity and PVL.
Findings:
- Scissoring gait
- Toe-walking
- Hip adductor tightness
- Hamstring and gastrocnemius contracture
- Upper limbs relatively less affected

c. Spastic quadriplegia or bilateral CP with all limbs affected

All four limbs involved, often upper limbs as severely as or more severely than lower limbs.
Usually due to more severe/diffuse brain injury.
Associated with:
- Severe intellectual disability
- Epilepsy
- Feeding and swallowing difficulties
- Visual impairment
- Severe scoliosis and hip displacement
- Dependence for mobility and activities of daily living

2. Dyskinetic cerebral palsy

Characterized by abnormal involuntary movement and variable tone.

Forms

Dystonia: sustained or intermittent muscle contractions causing twisting movements or abnormal postures.
Chorea: rapid, irregular, unpredictable movements.
Athetosis: slow, writhing movements, particularly affecting distal limbs.
Choreoathetosis: mixed choreic and athetoid movements.

Clinical features

Fluctuating muscle tone
Difficulty maintaining posture
Involuntary facial, tongue, trunk, and limb movements
Difficulty with speech and feeding due to oromotor involvement
Hearing impairment may coexist, especially after kernicterus
Cognition may be better than suggested by severe motor and communication disability

3. Ataxic cerebral palsy

Least common isolated type.

Clinical features

Hypotonia in infancy, which may later evolve
Poor balance
Broad-based gait
Incoordination
Dysmetria
Intention tremor
Difficulty with fine motor tasks
Speech may be dysarthric or scanning

4. Mixed cerebral palsy

More than one motor pattern is present.
Commonly spasticity plus dystonia.
Often seen in extensive brain injury.

B. Classification by anatomical distribution

Term	Distribution
Monoplegia	One limb affected, uncommon
Hemiplegia	Arm and leg on one side affected
Diplegia	All four limbs affected, legs more than arms
Quadriplegia/tetraplegia	All four limbs substantially affected
Triplegia	Three limbs affected, uncommon
Double hemiplegia	All limbs involved, upper limbs may be more severely affected

Modern terminology: It is often preferable to state whether CP is unilateral or bilateral, followed by the motor type and GMFCS level.

Example:
“Bilateral spastic cerebral palsy with lower-limb predominance, GMFCS level III.”

Gross Motor Function Classification System (GMFCS)

GMFCS classifies usual gross motor function in CP from Level I to Level V. It is based on self-initiated movement, especially sitting, transfers, and mobility. It is age-related and helps guide therapy, equipment, prognosis, and planning.

GMFCS level	Functional description
I	Walks without limitations. Can run and jump, but speed, balance, and coordination may be reduced.
II	Walks with limitations. Difficulty with uneven ground, long distances, crowds, running, and jumping. May use handrail on stairs.
III	Walks using a hand-held mobility device, such as crutches or walker. May use wheeled mobility for longer distances.
IV	Self-mobility is limited. Usually uses powered mobility or requires physical assistance/wheelchair for community mobility.
V	Transported in a manual wheelchair. Severe limitation of head and trunk control; dependent for mobility.

GMFCS exam points

Level I-II: ambulant, though limitations occur at Level II.
Level III: ambulant with a walking aid.
Level IV-V: wheelchair-dependent for most mobility.
GMFCS assesses gross motor function, not intelligence, language, hand function, or quality of life.
Higher GMFCS levels carry greater risks of:
- Hip displacement
- Scoliosis
- Pain
- Feeding and respiratory difficulties
- Dependence for care

One-Minute Revision Summary

CP is a permanent motor and postural disorder caused by a non-progressive injury to the developing brain.
The brain lesion is static, but disability and musculoskeletal complications can change with age.
Major causes: prematurity/PVL, congenital abnormalities, infection, stroke, HIE, hemorrhage, severe jaundice, and postnatal CNS injury.
Spastic CP is the commonest subtype.
Spastic diplegia is classically linked to prematurity and PVL.
Dyskinetic CP is linked to basal ganglia injury and may follow kernicterus.
Classify CP by:
1. Motor type
2. Distribution
3. Functional severity using GMFCS I-V.

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Cerebral Palsy: Diagnosis and Differential Diagnosis

1. Principles of Diagnosis

Cerebral palsy (CP) is a clinical diagnosis.
It is based on:
1. History
2. Developmental trajectory
3. Neurological and musculoskeletal examination
4. Neuroimaging, usually MRI, where indicated
5. Exclusion of progressive, genetic, metabolic, neuromuscular, and spinal disorders

There is no single confirmatory blood test for CP.

The diagnosis requires a permanent motor disorder due to a non-progressive disturbance of the developing brain. The child may acquire secondary contractures, hip displacement, or worsening gait with growth, but there should not be progressive loss of acquired neurological function.

Bradley and Daroff's Neurology in Clinical Practice, p. 2881.

2. When to Suspect Cerebral Palsy

A. Developmental red flags

Consider CP in a child with delayed or abnormal gross-motor development, especially with known risk factors such as prematurity, neonatal encephalopathy, neonatal seizures, stroke, or CNS infection.

Important motor red flags

Age	Concerning finding
Before 6 months	Poor head control, persistent primitive reflexes, marked hypotonia or stiffness, poor spontaneous movement
4-8 months	Persistent fisting, asymmetrical movements, poor trunk control, inability to roll appropriately
8 months	Not sitting independently, corrected for gestational age
Before 12 months	Persistent hand preference or asymmetric hand use
12-18 months	Delayed standing or walking, toe walking, scissoring, frequent falls
18 months	Not walking independently, corrected for gestational age

The NICE CP guideline identifies delayed sitting by 8 months, delayed walking by 18 months, and hand asymmetry before 1 year as important milestones requiring assessment.

B. Typical clinical manifestations

In an infant

Delayed motor milestones
Abnormal muscle tone:
- Early hypotonia may later become spasticity
- Persistent stiffness or extensor posturing
Feeding difficulty
Poor head and trunk control
Persistence of primitive reflexes
Delayed development of protective reactions
Asymmetric use of limbs

In an older child

Spastic gait, toe walking, scissoring, crouched gait, or circumduction gait
Hyperreflexia, clonus, extensor plantar response
Contractures
Limited selective voluntary motor control
Dystonia, choreoathetosis, ataxia, or tremor
Speech, feeding, visual, hearing, cognitive, or seizure comorbidity

3. Diagnostic Approach

Step 1: History

A detailed history establishes whether there was a plausible injury or abnormality affecting the developing brain.

A. Antenatal history

Ask about:

Maternal infection, fever, chorioamnionitis
Hypertension, pre-eclampsia, diabetes, thyroid disease
Reduced fetal movements
Drug, alcohol, tobacco, or toxin exposure
Multiple gestation
Fetal growth restriction
Congenital malformations identified antenatally
Family history of developmental delay, progressive spasticity, dystonia, ataxia, neuropathy, or metabolic disease

B. Perinatal and neonatal history

Ask about:

Gestational age and birth weight
Prematurity and NICU admission
Resuscitation, low Apgar score, neonatal encephalopathy
Hypoxic-ischemic event
Placental abruption, cord prolapse, emergency cesarean delivery
Neonatal seizures
Intracranial hemorrhage or stroke
Sepsis or meningitis
Severe neonatal jaundice
Hypoglycemia and other metabolic instability
Respiratory failure or prolonged ventilation

C. Postnatal history

Ask about:

Head trauma, including non-accidental injury
Meningitis or encephalitis
Stroke
Near drowning or severe hypoxic event
Seizures
Developmental progression versus regression
Feeding, choking, aspiration, constipation, sleep, pain, and functional abilities

D. Developmental history

Document each domain:

Gross motor
Fine motor and hand use
Language and communication
Cognition/problem-solving
Vision and hearing
Social development

Key question: Has the child lost previously acquired skills?

Loss of milestones suggests a progressive neurological or metabolic disorder, not uncomplicated CP.

Bradley and Daroff's Neurology in Clinical Practice, p. 2881.

Step 2: Examination

A. General examination

Assess:

Growth parameters, including head circumference
Dysmorphic features
Neurocutaneous markers
Organomegaly
Skeletal abnormalities
Evidence of malnutrition or feeding dysfunction

These may point to a genetic, metabolic, or syndromic diagnosis.

B. Neurological examination

Tone

Spasticity: velocity-dependent increase in resistance to passive movement
Dystonia: sustained or intermittent abnormal postures caused by involuntary contractions
Hypotonia: reduced resistance to passive movement
Rigidity: less common, may suggest extrapyramidal disease

Reflexes

Look for:

Hyperreflexia
Sustained clonus
Extensor plantar response
Persistent primitive reflexes
Delayed protective responses

Persistence of primitive reflexes and failure of mature motor patterns support significant motor pathway dysfunction. Campbell's Operative Orthopaedics, p. 1553.

Motor and posture assessment

Assess:

Symmetry of spontaneous movements
Head and trunk control
Selective voluntary motor control
Sitting, standing, transfers, gait, and balance
Hand function
Joint range of motion and contractures
Hip abduction and spinal alignment
GMFCS level

C. Associated impairments to screen for

Epilepsy
Visual impairment, including strabismus and cortical visual impairment
Hearing loss
Intellectual disability and learning difficulty
Autism spectrum disorder or behavioral difficulty
Speech and language impairment
Dysphagia, aspiration, poor nutrition
Drooling
Sleep problems
Pain
Bladder/bowel dysfunction

4. Investigations

A. Brain MRI

Role

MRI is the preferred neuroimaging study when the cause is uncertain, atypical features are present, or prior imaging has not clarified the likely brain disturbance.

MRI may demonstrate:

Periventricular leukomalacia
Periventricular hemorrhagic infarction
Old ischemic stroke
Cerebral malformations
Basal ganglia injury after severe hypoxia or kernicterus
Cortical or white-matter injury
Hydrocephalus or other structural disorders

MRI patterns and likely phenotype

MRI finding	Typical association
Periventricular white-matter injury/PVL	Spastic diplegia, particularly in preterm infants
Unilateral arterial infarct	Spastic hemiplegia
Basal ganglia-thalamic injury	Dyskinetic CP, especially dystonia
Diffuse cortical/subcortical injury	Severe bilateral spastic CP
Cortical malformation	Consider genetic or developmental cause

Important points

A normal MRI does not exclude CP.
MRI may be deferred if there is an already well-established cause and imaging would not alter management.
Sedation or general anesthesia may be needed in young children.
Repeat MRI may be appropriate if early imaging was immature, technically limited, or clinical features evolve. This is consistent with NICE assessment guidance.

B. Electroencephalography

EEG is not required to diagnose CP.

Request EEG when:

Seizures are suspected
Episodes of altered awareness occur
There are recurrent unexplained events
Epileptic encephalopathy is a consideration

C. Vision and hearing assessment

Arrange formal testing when there is:

Delayed language
Suspected hearing loss
Poor visual tracking
Strabismus
Possible cortical visual impairment
History of prematurity, severe jaundice, CNS infection, or hypoxic injury

D. Genetic testing

Consider chromosomal microarray, targeted gene panel, or exome/genome sequencing when:

No clear perinatal or acquired cause exists
MRI is normal, non-specific, or shows a malformation
There is a family history of a neurological condition
The phenotype is atypical
There are dysmorphic features, congenital anomalies, or unexplained intellectual disability
There is progressive spasticity, dystonia, or ataxia
There are features suggesting hereditary spastic paraplegia or a leukodystrophy

A growing proportion of apparent CP may have an underlying genetic diagnosis. The textbook notes clinically relevant copy-number variants and monogenic disorders in subsets of children previously labelled as CP. Bradley and Daroff's Neurology in Clinical Practice, p. 2881.

E. Metabolic tests

Order selectively when there are red flags for a metabolic disorder, such as:

Regression
Episodic deterioration
Fasting intolerance
Recurrent vomiting or encephalopathy
Movement disorder with fluctuation
Organomegaly
Unexplained seizures
Consanguinity or affected siblings
Unusual MRI pattern

Possible tests, guided by a pediatric neurologist or metabolic specialist:

Blood glucose, lactate, ammonia
Plasma amino acids
Acylcarnitine profile
Urine organic acids
Creatine kinase when muscular disease is suspected
Very-long-chain fatty acids when a peroxisomal disorder is suspected
Disease-specific testing where clinically indicated

5. Early Diagnosis in High-Risk Infants

In high-risk infants, CP can often be identified before the usual age of confident clinical diagnosis using a combination of:

General Movements Assessment, especially absent fidgety movements at 3-5 months corrected age
Hammersmith Infant Neurological Examination (HINE)
Brain MRI, when appropriate

These approaches identify high-risk infants early so therapy and surveillance can begin promptly. Recent systematic reviews address implementation and early screening, including PMID 41474840 and PMID 37021615. They support early structured assessment but do not replace individualized clinical evaluation.

6. Differential Diagnosis

The principal diagnostic task is to differentiate CP from disorders that are:

Progressive
Genetic
Metabolic
Neuromuscular
Spinal
Orthopedic
Transient developmental variants

A. Differential diagnosis by category

Category	Examples	Clues against CP
Progressive neurodegenerative disorders	Leukodystrophies, mitochondrial disease, neuronal ceroid lipofuscinosis	Regression, progressive deterioration, new neurological signs
Genetic spasticity disorders	Hereditary spastic paraplegia, genetic dystonia	Family history, progressive lower-limb spasticity, normal/atypical MRI
Neuromuscular disease	Duchenne muscular dystrophy, spinal muscular atrophy, congenital myopathy, peripheral neuropathy	Weakness, reduced/absent reflexes, fasciculations, elevated CK, no UMN signs
Metabolic disorders	Dopa-responsive dystonia, glutaric acidemia type I, mitochondrial diseases, amino/organic acidemias	Fluctuation, episodic decompensation, diurnal variation, regression
Spinal disorders	Tethered cord, spinal tumor, syringomyelia, cervical myelopathy	Sensory level, bladder dysfunction, back pain, progressive/asymmetric signs
Brain malformation/genetic syndrome	Lissencephaly, schizencephaly, tuberous sclerosis-related disorders	Dysmorphism, congenital anomalies, unusual MRI pattern
Primary orthopedic conditions	Developmental dysplasia of hip, clubfoot, limb-length discrepancy	Normal neurological examination
Developmental variants	Benign hypotonia, transient dystonia of prematurity, idiopathic toe walking	Improving course, normal reflexes and motor progression

B. High-yield differential diagnoses

1. Hereditary spastic paraplegia (HSP)

Often mistaken for spastic diplegic CP.

Suggestive features

Family history of similar gait disorder
Slowly progressive lower-limb spasticity
Normal early development followed by progressive gait impairment
No clear perinatal insult
Normal or non-specific brain MRI
Complicated forms may include neuropathy, ataxia, optic atrophy, cognitive impairment, or seizures

Distinguishing point: CP is non-progressive; HSP is often progressive.

2. Dopa-responsive dystonia

May mimic spastic diplegia or dystonic CP.

Suggestive features

Diurnal fluctuation: worse later in the day, better after sleep
Progressive dystonia
No clear perinatal risk factors
Dramatic response to levodopa

This diagnosis matters because it is treatable.

3. Duchenne muscular dystrophy

Can be mistaken for diplegic CP in a boy with delayed walking.

Features favoring DMD

Proximal muscle weakness rather than spasticity
Gowers sign
Calf pseudohypertrophy
Waddling gait
Reduced or normal reflexes early, rather than hyperreflexia
Markedly elevated creatine kinase

4. Spinal muscular atrophy

Features:

Hypotonia
Weakness
Tongue fasciculations
Reduced or absent reflexes
No spasticity or extensor plantar response

5. Leukodystrophy

Features:

Initially normal development followed by regression
Progressive spasticity or ataxia
Declining cognition or vision
Progressive white-matter changes on MRI

6. Brain tumor or hydrocephalus

Features:

Progressive headache, vomiting, papilledema
Increasing head circumference
New focal deficits
Deteriorating gait or consciousness

7. Tethered cord/spinal pathology

Features:

Progressive gait change
Back pain
Scoliosis
Bladder or bowel dysfunction
Sensory changes
Sacral dimple, hairy patch, or other cutaneous spinal stigmata

8. Autism or global developmental delay without CP

Motor delay can occur, but CP requires a persistent abnormality of movement/posture attributable to a brain disturbance. Tone, reflexes, gait, and motor-pattern abnormalities should be carefully assessed.

7. Red Flags Against Cerebral Palsy

Reconsider the diagnosis and refer to pediatric neurology if any of the following occur:

Loss of acquired developmental, cognitive, or motor skills
Progressive weakness, spasticity, dystonia, ataxia, or loss of ambulation
No identifiable risk factor and an atypical clinical pattern
Strong family history of progressive neurological disorder
Unexplained episodic deterioration
Marked day-to-day or diurnal fluctuation in dystonia
Peripheral signs: muscle wasting, fasciculations, absent reflexes, sensory loss
New focal neurological signs
Severe or unusual headaches, vomiting, papilledema
Disproportionate pain, bladder dysfunction, or sensory level
Normal MRI plus atypical phenotype
Dysmorphic features, congenital anomalies, organomegaly, or unusual skin findings

NICE specifically highlights absent known risk factors, family history of progressive disease, developmental regression, and unexpected focal signs as reasons to review a CP diagnosis. NICE recommendations.

8. Exam Answer Framework: “How Will You Diagnose CP?”

Write the following:

Clinical diagnosis based on a persistent motor/postural abnormality from early life and a non-progressive developmental course.
History: antenatal, perinatal, neonatal, postnatal events; developmental progress; family history; regression.
Examination: tone, reflexes, posture, gait, primitive reflexes, contractures, selective motor control, associated sensory and cognitive impairments.
Classify by motor type, distribution, and GMFCS.
MRI brain to identify structural injury, malformation, stroke, or white-matter injury when etiology is uncertain or presentation is atypical.
Screen for comorbidities: epilepsy, vision, hearing, feeding, speech, cognition, sleep, and pain.
Exclude mimics, especially HSP, neuromuscular disease, metabolic/genetic disorders, leukodystrophy, and spinal disease.
Investigate genetically/metabolically if there is regression, family history, no risk factor, atypical phenotype, malformation, normal MRI, or progressive course.

One-line conclusion

Cerebral palsy is diagnosed clinically by identifying a persistent, non-progressive motor disorder from early development, establishing the likely brain disturbance with history and MRI where appropriate, and actively excluding progressive genetic, metabolic, neuromuscular, and spinal mimics.

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