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Leukodystrophyies it’s presentation clinical features imaging and differential diagnosis

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leukodystrophy MRI brain white matter changes

**Imaging Modality:** Magnetic Resonance Imaging (MRI), T2-weighted axial section.

**Imaging Modality:** Magnetic Resonance Imaging (MRI), T2-weighted axial section.

**Imaging Modality:** Axial Magnetic Resonance Imaging (MRI), T1-weighted sequence.

**Imaging Modality:** Axial Magnetic Resonance Imaging (MRI), T1-weighted sequence.

This composite brain MRI displays diagnostic images from two siblings with 4H leukodystrophy (Hypomyelination, Hypodontia, and Hypogonadotropic Hypogonadism). Panels A and B are sagittal T2-weighted images showing prominent cerebellar atrophy, characterized by enlarged sulci and reduced folial volume (white arrows, right). Both siblings also exhibit hypophysis (pituitary) dysplasia, with an abnormally small or flattened pituitary gland visible in the sella turcica (white arrows, left). Panels C and D are axial FLAIR MRI sequences evaluating white matter integrity. Panel C (brother) shows relatively normal signal intensity. Panel D (sister) reveals a focal hyperintense lesion (white arrow) indicating local demyelination or hypomyelination within the subcortical white matter. These imaging findings are classic neuroradiological hallmarks of POLR3B-related leukodystrophy, illustrating the characteristic combination of neurodegenerative changes (cerebellar atrophy) and developmental defects (pituitary dysplasia and myelin deficiency).

This composite brain MRI displays diagnostic images from two siblings with 4H leukodystrophy (Hypomyelination, Hypodontia, and Hypogonadotropic Hypogonadism). Panels A and B are sagittal T2-weighted images showing prominent cerebellar atrophy, characterized by enlarged sulci and reduced folial volume (white arrows, right). Both siblings also exhibit hypophysis (pituitary) dysplasia, with an abnormally small or flattened pituitary gland visible in the sella turcica (white arrows, left). Panels C and D are axial FLAIR MRI sequences evaluating white matter integrity. Panel C (brother) shows relatively normal signal intensity. Panel D (sister) reveals a focal hyperintense lesion (white arrow) indicating local demyelination or hypomyelination within the subcortical white matter. These imaging findings are classic neuroradiological hallmarks of POLR3B-related leukodystrophy, illustrating the characteristic combination of neurodegenerative changes (cerebellar atrophy) and developmental defects (pituitary dysplasia and myelin deficiency).

Diagnostic axial MRI sections of the brain in a 1.5-year-old child demonstrating classic features of hypomyelination and cerebral atrophy. Panels (a-c) show T2-weighted turbo spin-echo (TSE) images, while panels (d-f) show corresponding T1-weighted inversion recovery (IR) images. There is diffuse, symmetric signal alteration throughout the cerebral white matter, manifesting as hyperintensity on T2WI and hypointensity on T1WI. These changes specifically involve the internal and external capsules, the corpus callosum, frontal deep white matter, and the pre-aqueductal region. In addition to the white matter signal changes, there is notable diffuse prominence of the cerebral sulci and enlargement of the subarachnoid spaces, indicative of generalized cerebral atrophy. Clinically, this pattern of hypomyelination combined with hypodontia and hypogonadotropic hypogonadism (suggested by the '4H syndrome' context) is characteristic of RNA polymerase III-related leukodystrophy (POLR3A mutation). The images serve as an educational example of leukodystrophy classification based on signal intensity on standard MRI sequences.

Diagnostic axial MRI sections of the brain in a 1.5-year-old child demonstrating classic features of hypomyelination and cerebral atrophy. Panels (a-c) show T2-weighted turbo spin-echo (TSE) images, while panels (d-f) show corresponding T1-weighted inversion recovery (IR) images. There is diffuse, symmetric signal alteration throughout the cerebral white matter, manifesting as hyperintensity on T2WI and hypointensity on T1WI. These changes specifically involve the internal and external capsules, the corpus callosum, frontal deep white matter, and the pre-aqueductal region. In addition to the white matter signal changes, there is notable diffuse prominence of the cerebral sulci and enlargement of the subarachnoid spaces, indicative of generalized cerebral atrophy. Clinically, this pattern of hypomyelination combined with hypodontia and hypogonadotropic hypogonadism (suggested by the '4H syndrome' context) is characteristic of RNA polymerase III-related leukodystrophy (POLR3A mutation). The images serve as an educational example of leukodystrophy classification based on signal intensity on standard MRI sequences.

**Imaging Modality:** Magnetic Resonance Imaging (MRI), Axial T2-weighted sequence.

**Imaging Modality:** Magnetic Resonance Imaging (MRI), Axial T2-weighted sequence.

A comparison chart of T2-weighted axial MRI brain slices from eight pairs of siblings diagnosed with Metachromatic Leukodystrophy (MLD). The image demonstrates the distribution and intensity of white matter signal changes during the early stages of the disease. In each sibling pair, there is a striking visual similarity in the pattern of leukodystrophy. The affected white matter exhibits symmetric T2-hyperintensity (bright signal) compared to the relatively darker gray matter, indicating demyelination and increased water content. Spatial patterns vary between pairs, ranging from diffuse white matter involvement (e.g., pairs 3.1/3.2 and 11.1/11.2) to more regional predominance in the frontal and parietal-occipital areas (e.g., pairs 4.1/4.2 and 12.1/12.2). Below each scan, numerical MRI scores are provided, highlighting the closely matched disease severity within each sibling pair. This clinical imaging set serves as an educational tool for recognizing the characteristic 'butterfly' or confluent hyperintense patterns of pediatric leukodystrophies and the high phenotypic concordance in familial cases.

A comparison chart of T2-weighted axial MRI brain slices from eight pairs of siblings diagnosed with Metachromatic Leukodystrophy (MLD). The image demonstrates the distribution and intensity of white matter signal changes during the early stages of the disease. In each sibling pair, there is a striking visual similarity in the pattern of leukodystrophy. The affected white matter exhibits symmetric T2-hyperintensity (bright signal) compared to the relatively darker gray matter, indicating demyelination and increased water content. Spatial patterns vary between pairs, ranging from diffuse white matter involvement (e.g., pairs 3.1/3.2 and 11.1/11.2) to more regional predominance in the frontal and parietal-occipital areas (e.g., pairs 4.1/4.2 and 12.1/12.2). Below each scan, numerical MRI scores are provided, highlighting the closely matched disease severity within each sibling pair. This clinical imaging set serves as an educational tool for recognizing the characteristic 'butterfly' or confluent hyperintense patterns of pediatric leukodystrophies and the high phenotypic concordance in familial cases.

Leukodystrophies are a large group of inherited disorders affecting white matter (myelin) formation, maintenance, or turnover. A full account of presentation, clinical features, imaging, and differential diagnosis for all of them would run many pages, so here is the map first.

Topic Breakdown

  1. Metachromatic Leukodystrophy (MLD) - arylsulfatase A deficiency; late-infantile, juvenile, adult forms
  2. Krabbe Disease (Globoid Cell Leukodystrophy) - galactocerebrosidase deficiency
  3. X-linked Adrenoleukodystrophy / Adrenomyeloneuropathy (X-ALD/AMN) - peroxisomal, VLCFA accumulation
  4. Pelizaeus-Merzbacher Disease - PLP1 mutation, hypomyelinating
  5. Vanishing White Matter Disease (VWM) - EIF2B mutations, stress-triggered deterioration
  6. Alexander Disease - GFAP mutation, frontal-predominant
  7. Canavan Disease - aspartoacylase deficiency, macrocephaly
  8. 4H Leukodystrophy / POLR3-related - hypomyelination, hypodontia, hypogonadotropic hypogonadism
  9. Approach to imaging patterns (which white matter distribution points to which disease) and overall differential diagnosis (leukodystrophy vs leukoencephalopathy vs acquired demyelination like MS/ADEM vs toxic-metabolic)

Brief Overview

Leukodystrophies typically present with progressive motor regression (spasticity, ataxia), cognitive decline, and sometimes seizures or peripheral neuropathy, with onset patterns ranging from infantile to adult depending on the specific disease and residual enzyme activity. Common shared clinical clues include loss of previously acquired milestones, pyramidal signs out of proportion to cognitive findings (or vice versa), optic atrophy, and in some (Krabbe, MLD, X-ALD) peripheral nerve involvement causing hyporeflexia despite spasticity.
MRI is the primary diagnostic tool. Key imaging principles:
  • Distribution (periventricular vs subcortical, frontal vs parieto-occipital, symmetric vs asymmetric) is often disease-specific - e.g., MLD and X-ALD classically start in parieto-occipital/periventricular white matter with a "butterfly" pattern, while Alexander disease is frontal-predominant.
  • Signal characteristics: confluent T2/FLAIR hyperintensity with T1 hypointensity indicates demyelination; diffuse mild T2 hyperintensity without significant atrophy suggests hypomyelination (Pelizaeus-Merzbacher, 4H).
  • Contrast enhancement at the leading edge (X-ALD) suggests active inflammatory demyelination.
  • Associated structural findings - cerebellar atrophy (POLR3-related), macrocephaly (Canavan, Alexander), calcifications, basal ganglia/thalamic involvement (Krabbe) - help narrow the differential.
Differential diagnosis broadly separates genetic leukodystrophies from acquired white matter disease (MS, ADEM, PML, vasculitis, toxic/metabolic leukoencephalopathy, HIV encephalopathy) and from mitochondrial or other genetic leukoencephalopathies that mimic classic leukodystrophies.
Since going deep on all of these with full clinical/imaging/DDx detail in one response would be unwieldy, which one would you like me to cover in depth?
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Which leukodystrophy (or aspect) would you like me to go into detail on?

Leukodystrophies are a large group of inherited disorders affecting white matter (myelin) formation, maintenance, or turnover. A full account of presentation, clinical features, imaging, and differential diagnosis for all of them would run many pages, so here is the map first.

Topic Breakdown

  1. Metachromatic Leukodystrophy (MLD) - arylsulfatase A deficiency; late-infantile, juvenile, adult forms
  2. Krabbe Disease (Globoid Cell Leukodystrophy) - galactocerebrosidase deficiency
  3. X-linked Adrenoleukodystrophy / Adrenomyeloneuropathy (X-ALD/AMN) - peroxisomal, VLCFA accumulation
  4. Pelizaeus-Merzbacher Disease - PLP1 mutation, hypomyelinating
  5. Vanishing White Matter Disease (VWM) - EIF2B mutations, stress-triggered deterioration
  6. Alexander Disease - GFAP mutation, frontal-predominant
  7. Canavan Disease - aspartoacylase deficiency, macrocephaly
  8. 4H Leukodystrophy / POLR3-related - hypomyelination, hypodontia, hypogonadotropic hypogonadism
  9. Approach to imaging patterns (which white matter distribution points to which disease) and overall differential diagnosis (leukodystrophy vs leukoencephalopathy vs acquired demyelination like MS/ADEM vs toxic-metabolic)

Brief Overview

Leukodystrophies typically present with progressive motor regression (spasticity, ataxia), cognitive decline, and sometimes seizures or peripheral neuropathy, with onset patterns ranging from infantile to adult depending on the specific disease and residual enzyme activity. Common shared clinical clues include loss of previously acquired milestones, pyramidal signs out of proportion to cognitive findings (or vice versa), optic atrophy, and in some (Krabbe, MLD, X-ALD) peripheral nerve involvement causing hyporeflexia despite spasticity.
MRI is the primary diagnostic tool. Key imaging principles:
  • Distribution (periventricular vs subcortical, frontal vs parieto-occipital, symmetric vs asymmetric) is often disease-specific - e.g., MLD and X-ALD classically start in parieto-occipital/periventricular white matter with a "butterfly" pattern, while Alexander disease is frontal-predominant.
  • Signal characteristics: confluent T2/FLAIR hyperintensity with T1 hypointensity indicates demyelination; diffuse mild T2 hyperintensity without significant atrophy suggests hypomyelination (Pelizaeus-Merzbacher, 4H).
  • Contrast enhancement at the leading edge (X-ALD) suggests active inflammatory demyelination.
  • Associated structural findings - cerebellar atrophy (POLR3-related), macrocephaly (Canavan, Alexander), calcifications, basal ganglia/thalamic involvement (Krabbe) - help narrow the differential.
Differential diagnosis broadly separates genetic leukodystrophies from acquired white matter disease (MS, ADEM, PML, vasculitis, toxic/metabolic leukoencephalopathy, HIV encephalopathy) and from mitochondrial or other genetic leukoencephalopathies that mimic classic leukodystrophies.
Since going deep on all of these with full clinical/imaging/DDx detail in one response would be unwieldy, which one would you like me to cover in depth?
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leukodystrophy diagnosis MRI pattern

Leukodystrophies: Presentation, Clinical Features, Imaging, and Differential Diagnosis

Leukodystrophies are a heterogeneous group of genetic disorders that primarily affect the formation, maintenance, or turnover of CNS myelin (and sometimes peripheral myelin). They are classified as either demyelinating (myelin is formed then breaks down, e.g., MLD, Krabbe, X-ALD) or hypomyelinating (myelin never forms properly, e.g., Pelizaeus-Merzbacher disease, 4H/POLR3-related). Below is a disease-by-disease summary followed by a general differential-diagnosis framework.

1. Metachromatic Leukodystrophy (MLD)

Cause: Arylsulfatase A deficiency (or prosaposin deficiency) causing sulfatide accumulation.
Presentation/Clinical features:
  • Late-infantile (most common, onset 1-2 yrs): gait regression, hypotonia progressing to spasticity, loss of speech, optic atrophy, peripheral neuropathy (hyporeflexia despite pyramidal signs is a classic clue)
  • Juvenile (4-16 yrs): behavioral/cognitive decline preceding motor signs, school failure, clumsiness
  • Adult: psychiatric presentation (psychosis, personality change) mimicking primary psychiatric illness, followed by dementia and spasticity
Imaging: Symmetric, confluent periventricular white matter changes (hyperintense T2/FLAIR, hypointense T1) with a "tigroid" or "leopard skin" pattern (radiating stripes of spared perivascular white matter within demyelinated regions), sparing subcortical U-fibers early. Corpus callosum thinning.
Differential diagnosis: Krabbe disease (late-onset), childhood Gaucher/Niemann-Pick disease, neuroaxonal dystrophy, early-onset hereditary polyneuropathy (given peripheral nerve involvement), and adult presentations must be distinguished from primary psychiatric disorders.

2. Krabbe Disease (Globoid Cell Leukodystrophy)

Cause: Galactocerebrosidase (GALC) deficiency.
Presentation/Clinical features:
  • Infantile (most severe): irritability, hyperesthesia, feeding difficulty, hypertonia progressing to opisthotonic posturing, blindness, seizures, rapid deterioration
  • Late-onset/adult forms: spastic paraparesis, peripheral neuropathy, vision loss, slower progression
Imaging: Early involvement of corticospinal tracts, corona radiata, and cerebellar white matter; T2 hyperintensity in periventricular white matter, thalami may show increased density/signal change. Optic nerve enlargement.
Differential diagnosis: MLD, Leigh disease, Gaucher disease, other causes of infantile hypertonia with irritability; peripheral neuropathy component overlaps with hereditary motor-sensory neuropathies.

3. X-linked Adrenoleukodystrophy / Adrenomyeloneuropathy (X-ALD/AMN)

Cause: ABCD1 mutation, defective peroxisomal beta-oxidation, very-long-chain fatty acid (VLCFA) accumulation.
Presentation/Clinical features:
  • Childhood cerebral form (boys, 4-8 yrs): behavioral change, declining school performance, visual/auditory processing deficits, rapidly progressive to vegetative state
  • Adrenomyeloneuropathy (adult men): progressive spastic paraparesis, sensory ataxia, sphincter dysfunction, peripheral neuropathy
  • Addison's disease (primary adrenal insufficiency) may precede, accompany, or follow neurologic symptoms - fatigue, hyperpigmentation, hypotension
  • Heterozygous female carriers may develop a milder myelopathy in later life
Imaging: Classic pattern is symmetric parieto-occipital and splenium of corpus callosum white matter demyelination with a characteristic enhancing leading edge on gadolinium (representing active inflammatory demyelination) - considered relatively pathognomonic.
Differential diagnosis: MLD, other peroxisomal disorders, MS (in adults with spinal cord-predominant AMN), hereditary spastic paraplegia, vitamin B12 deficiency (subacute combined degeneration).

4. Pelizaeus-Merzbacher Disease (PMD)

Cause: PLP1 gene mutation/duplication (X-linked), a hypomyelinating disorder.
Presentation/Clinical features: Infantile nystagmus and pendular eye movements, head titubation, hypotonia progressing to spasticity, ataxia, developmental delay; slow progression compared to demyelinating leukodystrophies.
Imaging: Diffuse, relatively unchanging (non-progressive over time) T2 hyperintensity throughout white matter without significant volume loss early - consistent with a failure of myelin formation rather than breakdown. Cerebellar atrophy in some.
Differential diagnosis: Other PLP1-related disorders (SPG2/hereditary spastic paraplegia), other hypomyelinating leukodystrophies (4H, Cockayne syndrome), congenital nystagmus syndromes.

5. Vanishing White Matter Disease (VWM)

Cause: EIF2B1-5 mutations affecting translation initiation, stress-sensitive.
Presentation/Clinical features: Episodic neurological deterioration triggered by febrile illness, minor head trauma, or stress, with baseline slowly progressive ataxia and spasticity between episodes; can present in infancy through adulthood (including a milder ovarian failure-associated adult form in women).
Imaging: Diffuse white matter signal change with progressive cystic degeneration - vacuolated, "vanishing" white matter that becomes nearly CSF-like in signal on later scans; radiologically distinctive.
Differential diagnosis: Other stress/illness-triggered encephalopathies, mitochondrial disease (Leigh syndrome), other EIF2B-unrelated leukoencephalopathies with cystic change (megalencephalic leukoencephalopathy with subcortical cysts).

6. Alexander Disease

Cause: GFAP gene mutation (astrocyte intermediate filament protein).
Presentation/Clinical features: Infantile form - macrocephaly, seizures, developmental delay, spasticity; juvenile/adult forms present with bulbar symptoms, ataxia, and spasticity with less macrocephaly.
Imaging: Frontal-predominant white matter changes, periventricular rim enhancement, and characteristic involvement of the medulla/upper cervical spinal cord in adult-onset forms.
Differential diagnosis: Canavan disease and other macrocephaly-associated leukodystrophies, tumors (given enhancement pattern can raise mass concern), other bulbar-onset degenerative diseases in adult-onset cases.

7. Canavan Disease

Cause: Aspartoacylase deficiency, N-acetylaspartate (NAA) accumulation.
Presentation/Clinical features: Infantile macrocephaly, severe hypotonia progressing to spasticity, poor head control, seizures, blindness; more common in Ashkenazi Jewish population.
Imaging: Diffuse white matter T2 hyperintensity with predominant involvement of subcortical U-fibers (unusual, since most leukodystrophies spare U-fibers early), plus globus pallidus and thalamic involvement. MR spectroscopy shows markedly elevated NAA peak - a key distinguishing diagnostic feature.
Differential diagnosis: Alexander disease, glutaric aciduria type I, other macrocephalic leukoencephalopathies (megalencephalic leukoencephalopathy with subcortical cysts).

8. 4H Leukodystrophy / POLR3-related Disorders

Cause: POLR3A/POLR3B mutations (RNA polymerase III).
Presentation/Clinical features: Hypomyelination, Hypodontia (delayed/missing teeth), Hypogonadotropic Hypogonadism; ataxia, tremor, cognitive decline, and cerebellar signs.
Imaging: Diffuse hypomyelination with disproportionate cerebellar atrophy and pituitary dysplasia/hypoplasia - the combination of these features with hypomyelination is a strong diagnostic clue.
4H leukodystrophy MRI showing cerebellar atrophy and pituitary dysplasia
Differential diagnosis: Other hypomyelinating disorders (PMD), ataxia syndromes, other causes of delayed puberty with neurologic disease.

General Approach to Differential Diagnosis

When white matter disease is found on MRI, the key branch point is genetic leukodystrophy vs. acquired white matter disease:
CategoryExamplesDistinguishing clues
Acquired inflammatory/demyelinatingMultiple sclerosis, ADEM, neuromyelitis optica spectrum disorderAsymmetric, ovoid periventricular lesions, Dawson fingers, oligoclonal bands, relapsing-remitting course, later age of onset
InfectiousPML, HIV encephalopathy, subacute sclerosing panencephalitisImmunocompromised state, specific serologies
Toxic-metabolicB12 deficiency, chemotherapy (methotrexate), radiation, CO poisoningHistory of exposure, symmetric but non-genetic pattern
VascularCADASIL, small vessel ischemic diseaseAnterior temporal pole and external capsule involvement (CADASIL), migraine history, vascular risk factors
MitochondrialLeigh syndrome, MELASLactate elevation, basal ganglia/brainstem involvement, stroke-like episodes
Genetic leukodystrophyAs aboveSymmetric distribution, family history, specific enzyme/genetic confirmation, characteristic MRI pattern per disease
Practical imaging-pattern approach (used by radiologists per Grainger & Allison's Diagnostic Radiology and Bradley and Daroff's Neurology):
  • Predominant posterior (parieto-occipital) involvement -> X-ALD, MLD
  • Predominant frontal involvement -> Alexander disease
  • Diffuse with subcortical U-fiber involvement -> Canavan disease
  • Cystic/vanishing appearance -> VWM disease
  • Non-progressive, diffuse, mild signal change -> hypomyelinating disorders (PMD, 4H)
  • Cerebellar atrophy + pituitary dysplasia -> POLR3-related 4H leukodystrophy
  • Basal ganglia/thalamic signal change with peripheral neuropathy -> Krabbe disease
Comparison of MRI patterns across metachromatic leukodystrophy siblings showing symmetric periventricular white matter hyperintensity
Confirmatory diagnosis for most of these disorders ultimately relies on enzyme assays (arylsulfatase A, galactocerebrosidase), VLCFA levels, or targeted/next-generation genetic sequencing once the imaging pattern narrows the differential.
Sources: Adams and Victor's Principles of Neurology, 12th Ed.; Bradley and Daroff's Neurology in Clinical Practice; Goldman-Cecil Medicine International Edition; Grainger & Allison's Diagnostic Radiology.
Note on recent literature: A 2025 systematic review (PMID: 41214738, Orphanet J Rare Dis) on cognitive/intellectual functioning in leukodystrophy patients and 2024 systematic reviews on MLD natural history and prevalence (PMID: 38494502, 38383398) are consistent with the textbook descriptions above and don't contradict them - they add updated epidemiologic and cognitive-outcome data rather than changing the core clinical/imaging framework.
Let me know if you'd like me to go deeper into any single disorder (e.g., treatment options like hematopoietic stem cell transplantation or newer enzyme replacement/gene therapies for MLD and Krabbe disease).

Create a visual comparison poster of MRI patterns across leukodystrophies

Generating Image

A medical education poster comparing brain MRI white matter patterns across major leukodystrophies. Include labeled panels for: Metachromatic Leukodystrophy (symmetric periventricular white matter changes with tigroid/leopard-skin pattern), Krabbe Disease (corticospinal tract and periventricular involvement with thalamic changes), X-linked Adrenoleukodystrophy (symmetric parieto-occipital and splenium of corpus callosum demyelination with contrast-enhancing leading edge), Alexander Disease (frontal-predominant white matter changes with periventricular rim), Canavan Disease (diffuse white matter changes involving subcortical U-fibers with macrocephaly), Pelizaeus-Merzbacher Disease (diffuse mild hypomyelination without atrophy), Vanishing White Matter Disease (cystic degeneration of white matter), and 4H/POLR3-related Leukodystrophy (hypomyelination with cerebellar atrophy and pituitary dysplasia). Each panel should show a stylized axial brain MRI illustration with the affected white matter regions highlighted in a different color, with a small label and short caption underneath describing the key imaging feature and underlying disease name. Layout as a grid comparison chart suitable for medical teaching.

Here's the visual comparison poster of MRI patterns across the major leukodystrophies:
Leukodystrophy MRI Pattern Comparison Poster
The poster illustrates the eight key entities covered earlier, each with its characteristic imaging signature:
  • MLD - symmetric periventricular changes with tigroid/leopard-skin pattern
  • Krabbe disease - corticospinal tract and thalamic involvement
  • X-ALD - parieto-occipital/splenial demyelination with enhancing leading edge
  • Alexander disease - frontal-predominant white matter change
  • Canavan disease - diffuse change involving subcortical U-fibers, with macrocephaly
  • Pelizaeus-Merzbacher disease - diffuse, non-progressive hypomyelination
  • Vanishing white matter disease - cystic degeneration
  • 4H/POLR3-related leukodystrophy - hypomyelination with cerebellar atrophy and pituitary dysplasia
Note: this is an AI-generated illustrative schematic for teaching purposes, not an actual radiologic image. If you need real patient MRI examples for a specific entity to cross-check against, I can pull those from the medical image library - just let me know which one(s).
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