Q: Use this history and provide me neurological summary and all symptoms possible localization and justification of it and points favoring and against all localization and all possible Differential causes and diagnosis A: Neurological summary, localization and differential diagnosis Some handwriting was hard to read. I flag my assumptions where they matter. The age and sex of the patient are not given. I have assumed a male adult, because the notes say "his". There is no examination in the notes, so everything below comes from history alone. 1. Case summary Presentation: a man with a slowly progressive, asymmetric, lower-limb-onset weakness and wasting over about 10 years. Late features are distal sensory loss in the legs and proximal arm wasting with fasciculations. He now uses a wheelchair. Timeline Time Event ------ About 2016 10 yr ago Insidious difficulty rising from squatting Indian toilet, needing wall or support to pull up. Left leg worse than right. Within about 1 yr Needs railing on stairs. Left leg weak, so he puts more weight on the right. 2018-19 2 yr in Left foot drop: toe dragging, difficulty clearing the floor, slipping of footwear. Over 6-8 months he began walking on his heels. 2018 onwards Treated at Max and AIIMS Delhi with riluzole and edaravone suggests an MND label and had no benefit. 2023 Acute coronary syndrome, with two further stents. Right leg weakness began proximal first, then foot drop 6-8 months later, then bilateral foot drop. Knee buckling led to falls and a stick. About 2 yr ago Walker. About 1 yr ago Wheelchair, fully dependent for walking. 2024 Rituximab, 7 doses. 2025 IVIG 2 g/kg over 5 days. Feb 2025 Mycophenolate MMF for 6 months, plus prednisolone Omnacortil, 30 mg tapered over 6 months. Motor - Thigh muscle wasting for 5-6 years, left first, then right. - Wasting of both shoulders and arms for 2-3 years, though he reports no functional arm weakness. - Occasional twitching fasciculations at thigh and shoulder for 1-2 years. - Unintentional weight loss of 25-30 kg over the illness. Sensory - For 1.5-2 years: reduced appreciation of the floor and a "walking on cotton wool" feeling. - Numbness began in both soles and over a year rose to both knees. - He says touch, pain and hot/cold are preserved all over. - No cramps, paraesthesia, burning or pins and needles. - "Painless burns" is written in the notes. I read this as a history of burns he did not feel, which would conflict with intact pain sensation. - Hair loss and coldness of both legs below the knee, worse in winter, for 2-3 years. - Low back ache for 1-2.5 years, continuous and localized, with no root pain and no worsening on bending. Pertinent negatives - No arm weakness. He can comb his hair, do overhead tasks, hold and write normally, with no dropping of objects. - Head lift, bed turning, neck and shoulder shrug are normal. - No bulbar symptoms: normal chewing, swallowing, voice, no nasal regurgitation and no drooling or similar. - No cranial nerve symptoms: normal smell, vision no diplopia, no colour change, no gaze restriction, facial sensation, facial symmetry and hearing. - No sensory ataxia no imbalance in the dark. - No bladder or bowel disturbance, no sensory level, no memory problem. - No fever, joint pain, rash, ulcers, photosensitivity or Raynaud phenomenon. Family history: no consanguinity. The pedigree shows no marked affected relatives. 2. Symptom-by-symptom localization Symptom Localization Justification --------- Difficulty rising from squat, stairs, knee buckling Quadriceps/hip girdle: myopathy, anterior horn cell L2-L4, femoral nerve/lumbar plexus Proximal lower limb weakness. Quadriceps weakness causes knee buckling. Foot drop, toe dragging, heel walking, slipping footwear L4-L5 myotomes, peroneal nerve/sciatic, distal nerve, anterior horn cell, or tibialis anterior myopathy Dorsiflexion weakness. Heel walking is a compensation for it. Asymmetric onset LR with later spread to the other side Anterior horn cell, multifocal neuropathy, or asymmetric myopathy Asymmetry is unusual in length-dependent symmetric neuropathy or hereditary disease. Thigh wasting, shoulder and arm wasting Lower motor neuron or muscle Wasting without sensory cause. Fasciculations thigh, shoulder Anterior horn cell, root or axon, i.e. lower motor neuron Spontaneous motor unit discharge. Distal sensory loss up to the knees "cotton wool" Peripheral nerve, large fibre sensory Length-dependent, stocking-type, with preserved pain and temperature by report. Hair loss, coldness Autonomic/small fibre nerve, or peripheral vascular Trophic change. Peripheral arterial disease is plausible given his coronary disease. Low back ache Lumbar spine/root Mechanical, and not clearly related to the weakness. No bulbar, cranial nerve, cognitive or sphincter features Argues against brainstem, cortex, conus/cauda equina and cord Lesions at these levels are unlikely, but exam is needed. Weight loss Systemic or neuromuscular catabolic state Seen with MND, malignancy, amyloid, paraprotein, POEMS or diabetes. Overall localization: a lower motor neuron and/or sensorimotor neuromuscular disorder. The pattern is proximal and distal, asymmetric, in a lower-then-upper limb sequence. The sensory component points to nerve, while the pure-motor, fasciculating, asymmetric wasting points to anterior horn cell or muscle. No upper motor neuron, cerebral, brainstem or sphincter pathway is implicated by history. 3. Candidate localizations: points for and against A. Anterior horn cell motor neuron disease, lower motor neuron predominant For - Asymmetric focal onset in one leg, with slow spread to the other leg and then the arms. - Fasciculations and wasting in thigh and shoulder. - Weight loss. - Prior MND treatment riluzole, edaravone suggests a specialist considered this. - Weakness without prominent pain or cramps. - Absent bulbar involvement for 10 years fits slow variants such as flail leg or PMA. Against - Duration is 10 years, far longer than typical ALS median about 3 years. Flail leg and SMA variants are the slow exceptions. - Distal sensory symptoms are atypical. Sensory loss in an MND-like picture should prompt a search for mimics. Neuroanatomy through Clinical Cases/textbooks/9781605359625/9781605359625block2.md notes MND produces deficits "usually without sensory abnormalities". - No cramps, no upper motor neuron features reported. Sub-variants: - Flail leg pseudopolyneuritic ALS. - Progressive muscular atrophy. - Adult-onset SMA type 4 or distal SMA. - Kennedy disease X-linked bulbospinal muscular atrophy. This gives proximal limb weakness, fasciculations and mild sensory neuropathy, usually with bulbar signs and gynaecomastia. The sensory loss and proximal onset fit, and a family history may be absent. B. Peripheral nerve / polyradiculoneuropathy For - Distal sensory loss in a stocking distribution, rising to the knees. - Trophic changes and "painless burns" suggest axonal sensory loss or small fibre involvement. - Foot drop. - Asymmetric motor onset fits a multifocal pattern such as MADSAM/Lewis-Sumner CIDP. - Harrison's/textbooks/9781265977061/9781265977061block51.md notes that symmetric proximal and distal weakness is the hallmark of CIDP. Against - Fasciculations and prominent wasting without early areflexia history are less typical. Reflexes are not documented. - No response to IVIG, rituximab, MMF and steroids. Treatment began very late about year 8, so axon loss could explain non-response, but non-response weakens an inflammatory diagnosis. - Proximal-before-distal, quadriceps-predominant onset is uncommon in length-dependent neuropathy. - Large-fibre loss is noted without sensory ataxia or pain. Sub-types: - Motor-predominant or asymmetric CIDP MADSAM, possibly with nodal/paranodal antibodies anti-NF155/CNTN1, which respond poorly to IVIG. - Multifocal motor neuropathy. This is pure motor and conduction block, usually arm-predominant, so the sensory loss and leg onset are against it. - Paraproteinaemic neuropathy anti-MAG IgM and POEMS. - Hereditary neuropathy see D below. C. Muscle myopathy For - Quadriceps-first weakness with knee buckling and falls, which Bradley and Daroff's Neurology in Clinical Practice/textbooks/9780323642613/9780323642613block5.md lists as a feature of inclusion body myositis IBM and of progressive muscular atrophy. - Thigh wasting and shoulder-girdle wasting. - Foot drop, as in scapuloperoneal or distal myopathies. - Asymmetry, slow progression over a decade, and no benefit from immunosuppression all fit IBM. - No sensory involvement would be expected, which is consistent with part of the picture. Against - Sensory symptoms stocking numbness, trophic changes are unexplained by myopathy alone. - Fasciculations are unusual they occur in some myopathies but are not typical. - IBM usually involves finger flexors and dysphagia. He reports normal grip and writing. Sub-types: - Inclusion body myositis. - Scapuloperoneal/FSHD. - Limb girdle dystrophy, e.g. dysferlinopathy. - Distal myopathy GNE, Miyoshi-type. - Late-onset Pompe disease proximal weakness, weight loss, later respiratory. - Myofibrillar/desmin myopathy, which can have cardiac involvement and neuropathy. - Myotonic dystrophy type 1/2. - Late-onset FSHD and Emery-Dreifuss-like phenotypes cardiac. D. Hereditary motor-sensory neuropathy / neuronopathy For - A 10-year course, asymmetry that is unusual but described, distal sensory loss, trophic changes and foot drop. - Specific forms: HSMN-proximal type TFG mutation causes proximal weakness, fasciculations, cramps and sensory loss in adulthood. Distal HMN, CMT2 and Charcot-Marie-Tooth with proximal involvement also fit. Against - No family history and no consanguinity. - No pes cavus or high arches documented. - Typical CMT starts distally and is symmetrical. - Onset in later adulthood is unusual. E. Cauda equina / lumbosacral root / cord For - Low back ache, bilateral leg weakness, wasting, and sensory loss. - Multilevel lumbar canal stenosis or radiculopathy can cause bilateral foot drop and knee weakness L3-L5. - Cervical spondylotic amyotrophy could explain proximal arm wasting. Combined cervical and lumbar disease is possible. - Syringomyelia could explain painless burns and arm wasting. Against - No root pain. - No bladder or bowel dysfunction. - No back pain with bending, no neurogenic claudication. - Arm wasting with legs implies multilevel disease. - Ten-year course with fasciculations is not typical. - Imaging should resolve this quickly. F. Plexus lumbosacral radiculoplexus neuropathy, diabetic amyotrophy For - Asymmetric thigh wasting, weight loss and proximal onset are classic. Diabetes status is not documented, and it is likely relevant given his coronary disease. Against - The course is normally subacute and painful, not a 10-year steady progression, and arm involvement is not expected. G. Central brain, brainstem, upper motor neuron Not supported. No cognitive, cranial nerve, bulbar or sphincter symptoms, and no spasticity or sensory level are described. Examination for hyperreflexia and Babinski signs is still needed to exclude ALS-plus. 4. Differential diagnosis Ranked by my judgement of fit with the history. This ranking is provisional until examination, nerve conduction and EMG are available. 1. Motor neuron disease, slow lower-motor-neuron variant flail leg syndrome or PMA, or adult SMA/Kennedy disease. Sensory loss would then be a mimic or comorbid neuropathy. 2. Inclusion body myositis or another asymmetric myopathy. Immunotherapy non-response and quadriceps-first weakness fit. 3. Immune-mediated neuropathy CIDP variants, MADSAM, nodal/paranodal antibody neuropathy, made less likely by non-response to IVIG, rituximab and steroids, though late treatment can leave only axonal loss. 4. Hereditary motor sensory neuropathy CMT2, HSMN-P, distal HMN. 5. Amyloid neuropathy hATTR or AL. The weight loss, painless burns, trophic changes and cardiac history justify a screen for it. 6. Paraproteinaemic neuropathy or POEMS. 7. Diabetic or metabolic neuropathy/amyotrophy. 8. Leprosy pure neuritic. Painless burns and asymmetric motor and sensory loss in an Indian patient make this worth excluding. 9. Structural: multilevel cervical and lumbar spondylotic radiculomyelopathy, syringomyelia. 10. Peripheral arterial disease not a cause of weakness, but it can explain the coldness and hair loss. 11. Malignancy-related disease. This includes paraneoplastic neuropathy or neuronopathy, and statin or drug-related causes amiodarone and other drugs should be reviewed. Statin myopathy cannot explain symptoms that began before the 2023 ACS. 12. Infectious or toxic: HIV, hepatitis, syphilis, lead and other heavy metals, and B12/copper/vitamin deficiency. 5. Next steps I would suggest - Examination to confirm: tone, power by myotome including finger flexors, reflexes, fasciculations, tongue, Babinski, sensation by modality vibration, proprioception, pinprick, Romberg, palpable nerves, pes cavus, scapular winging, pulses, orthostatic BP. - Neurophysiology: NCS axonal or demyelinating, conduction block and needle EMG across three regions, including paraspinals and the tongue. This is the single most useful test. - Bloods: CBC, glucose and HbA1c, TSH, B12, copper, ESR/CRP, CK, serum protein electrophoresis with immunofixation and free light chains, anti-MAG, HIV, hepatitis B/C, VDRL, ANA/ENA, ANCA, nodal/paranodal antibodies, anti-ganglioside antibodies, anti-cN1A for IBM. - Imaging: MRI whole spine, and muscle MRI or ultrasound pattern recognition, e.g. quadriceps and flexor digitorum profundus in IBM. - CSF: protein and cells. - Genetics: neuropathy and motor neuron panel, including AR CAG repeat Kennedy, TTR, SMN1, TFG, FSHD D4Z4, and a myopathy panel. - Biopsy: muscle or nerve if the above are unrevealing. - Cardiac assessment: echocardiogram and cardiac MRI or scintigraphy if amyloid or cardiomyopathy-associated myopathy is a concern. - Skin snip or slit smear and nerve USG if leprosy is suspected. 6. Literature check My PubMed search of the last 2 years systematic reviews and meta-analyses found nothing that contradicts or changes the textbook reasoning above. It returned imaging and cytokine reviews of CIDP, for example imaging in CIDPhttps://pubmed.ncbi.nlm.nih.gov/40452261/ PMID 40452261, which supports nerve ultrasound and MRI as adjuncts. I did not review the evidence for individual treatments in depth. 7. Where I am uncertain - Age, sex, reflexes, power grades and investigations are not in the notes. - I could not confirm whether the "painless burns" entry is a positive history, or what "No Excessive ..." refers to. - The ranking of motor neuron disease against myopathy against neuropathy cannot be settled without NCS/EMG and examination. Q: All lmn structure and points favoring and against it A: Lower motor neuron LMN structures: points for and against in this patient The LMN is the motor unit, running from the cell body to the muscle fibre. I have taken each level in turn, from proximal to distal. Everything below is from history alone. The notes give no reflexes, tone, power grades, EMG or NCS. Findings every level has to explain - Asymmetric onset, left leg before right, then slow spread over about 10 years. - Proximal leg weakness first squatting, stairs, knee buckling, then bilateral foot drop. - Thigh wasting, then shoulder and arm wasting with no functional arm weakness. - Fasciculations in the thigh and shoulder. - Weight loss of 25-30 kg. - Distal sensory loss up to the knees, with reported "painless burns" and hair loss and coldness below the knee. - No bulbar, cranial nerve or sphincter involvement. - No benefit from riluzole or edaravone. Later immunotherapy rituximab, IVIG, MMF, steroids also failed, but it was started late. --- 1. Anterior horn cell spinal motor neuron For Against ------ Fasciculations with wasting. Distal sensory loss stocking pattern. Asymmetric, focal onset in one leg with slow spread to the other leg, then the arms. Sensory symptoms should make you look for a mimic. Neuroanatomy through Clinical Cases/textbooks/9781605359625/9781605359625block2.md describes MND as producing motor deficits "usually without sensory abnormalities". Pure weakness without root pain or paraesthesia. A 10-year course is far longer than typical ALS. Flail leg and progressive muscular atrophy PMA variants are the slow exceptions. Proximal and distal involvement together, with arm wasting that is clinically silent. No cramps, bulbar signs or upper motor neuron features reported. Weight loss. Painless burns and trophic change are not explained. The patient was treated for MND earlier, so a specialist had considered it. Subtypes - Flail leg syndrome. Asymmetric distal leg onset, slow, and it can stay confined to the legs for years. The Frameworks for Internal Medicine/textbooks/9781496359308/9781496359308block4.md weakness chapter lists it among anterior horn cell causes. - PMA. Pure LMN involvement, seen in about 5-10% of ALS Goldman-Cecil/textbooks/9780323930345/9780323930345block56.md. - Adult SMA type 4 and distal SMA. Proximal-first weakness over many years fits. Fasciculations and sensory loss are less typical. - Kennedy disease X-linked bulbospinal neuronopathy. Fasciculations and proximal limb weakness fit, and sensory neuropathy is recognized in it. Against it are the absent bulbar signs, no documented gynaecomastia or tremor, and no family history. The Bradley and Daroff/textbooks/9780323642613/9780323642613block23.md text notes that sensory involvement is now part of the picture. - Post-polio syndrome or old polio. The history does not mention a childhood paralytic illness. Asymmetric wasting and fasciculations would fit. - Others. HIV-associated, monomelic amyotrophy benign, usually young, arm-predominant, self-limiting, and paraneoplastic motor neuronopathy. --- 2. Ventral nerve root and dorsal root radiculopathy / polyradiculopathy For Against ------ Low back ache for 1-2.5 years. No root pain, and the ache does not change with bending. Multilevel L2-L5 involvement can give quadriceps weakness, knee buckling and foot drop together. No bladder or bowel disturbance, no neurogenic claudication, no saddle symptoms. Asymmetric, with stocking-like sensory loss possible from multilevel dorsal root involvement. Arm and shoulder wasting would need separate cervical disease. Fasciculations occur with chronic root compression. A 10-year course with steady progression and no bladder involvement is unusual for stenosis. Polyradiculopathy options include CIDP, diabetic or infiltrative radiculopathy and arachnoiditis. Practical point: MRI whole spine is the quickest way to settle this level. --- 3. Plexus lumbosacral, brachial For Against ------ Asymmetric thigh wasting with weight loss is the classic picture of diabetic lumbosacral radiculoplexus neuropathy diabetic amyotrophy. Diabetes status is not documented. That condition is usually subacute and painful, and it evolves over months, not a decade. Proximal onset with later bilateral spread. Pain is absent here. Shoulder and arm wasting could be a brachial plexopathy or neuralgic amyotrophy. Both arms would not normally be affected so slowly and silently. Hereditary or immune plexopathies are possible. Nothing in the history suggests a plexus-specific event trauma, radiation, tumour, post-viral. Overall, the plexus level fits poorly because the course is too slow and painless. --- 4. Peripheral nerve polyneuropathy, mononeuropathy multiplex For Against ------ Stocking sensory loss rising to the knees over about a year. Fasciculations and prominent wasting are less typical. Foot drop and toe dragging. Proximal-first leg weakness quadriceps is uncommon in length-dependent neuropathy. Trophic change hair loss, coldness and painless burns point to axonal sensory or small fibre or autonomic involvement. Sensory symptoms came late, years after the weakness. Asymmetry fits a multifocal pattern MADSAM, mononeuritis multiplex such as leprosy or vasculitis. No response to IVIG, rituximab or steroids, though treatment began in about year 8. Harrison's/textbooks/9781265977061/9781265977061block51.md notes symmetric proximal and distal weakness is the hallmark of CIDP. No sensory ataxia reported. Subtypes to consider - CIDP and variants MADSAM, motor-predominant, including nodal/paranodal antibody neuropathies. Anti-NF155 and CNTN1 neuropathies respond poorly to IVIG. - Multifocal motor neuropathy. Motor-only and conduction block; usually arm-predominant, so sensory loss and leg onset argue against it. - Hereditary neuropathy CMT2, distal HMN, HSMN-P. No family history; asymmetry and proximal onset are unusual. - Amyloid hATTR, AL. Weight loss, painless burns, trophic change and cardiac disease justify a screen. Autonomic features are absent so far. - Paraproteinaemic neuropathy, POEMS. - Leprosy pure neuritic. Painless burns and asymmetric deficit; pain and temperature are reported as intact, so this needs examination of the skin and nerves. - Diabetic, toxic, nutritional B12, copper and infective HIV, hepatitis neuropathy. --- 5. Neuromuscular junction For Against ------ Proximal weakness. No fatigability, ptosis, diplopia or bulbar weakness. Wasting, fasciculations, sensory symptoms and a 10-year progressive course are not explained. This level is unlikely. Repetitive nerve stimulation is a simple check if other tests are unrevealing. --- 6. Muscle the end of the motor unit; often grouped with the LMN For Against ------ Quadriceps-first weakness with knee buckling and falls. Bradley and Daroff/textbooks/9780323642613/9780323642613block5.md lists inclusion body myositis IBM and PMA as causes of focal quadriceps weakness. Stocking sensory loss and trophic change are not explained. Asymmetric, slow, 10-year progression with no response to immunosuppression, typical of IBM. Fasciculations are not typical. Thigh wasting, shoulder girdle wasting and foot drop fit scapuloperoneal and distal myopathy patterns. IBM usually affects finger flexors and swallowing; grip and swallowing are normal here. No pain, no sensory involvement in the primary muscle disease. Subtypes: IBM, FSHD and other scapuloperoneal syndromes, LGMD e.g. dysferlinopathy, distal myopathy GNE, Miyoshi, late-onset Pompe, myofibrillar myopathy cardiac and neuropathic features, myotonic dystrophy, and Emery-Dreifuss-like phenotypes. His cardiac history makes the cardiac-associated ones worth keeping in mind. --- Summary ranking provisional Level Fit with this history ------ Anterior horn cell slow LMN-predominant MND, SMA, Kennedy High on motor features asymmetry, fasciculations, silent arm wasting. Sensory loss is the main problem. Muscle IBM, scapuloperoneal or distal myopathy Moderate to high on the weakness pattern. Poor on sensory loss and fasciculations. Peripheral nerve CIDP variants, hereditary, amyloid, leprosy Good on sensory and trophic features. Poor on pattern and treatment non-response. Root multilevel lumbar and cervical Moderate for legs. Poor for the arms and the 10-year course. Plexus Low, because of the slow and painless course. Neuromuscular junction Very low. A combined picture is also possible: a motor neuron disorder with a coexisting neuropathy for example diabetic, or Kennedy disease, or a neuromyopathy. What would discriminate the levels - EMG/NCS decisive. - Anterior horn cell: normal sensory nerve potentials, widespread chronic denervation, fasciculations in three regions. - Nerve: reduced sensory potentials, slow velocities or conduction block. - Muscle: short, small polyphasic units with early recruitment, and irritability in IBM. - Examination. Reflexes brisk with wasting suggests ALS; absent suggests neuropathy, finger flexor weakness, scapular winging, palpable nerves, skin patches, upper motor neuron signs. - MRI of the whole spine and of thigh and calf muscles. - Blood tests. CK mildly high in MND, higher in IBM, HbA1c, SPEP with immunofixation, anti-MAG, nodal antibodies, anti-cN1A, HIV and hepatitis, B12. - Genetics. CAG repeat in the androgen receptor gene, SMN1, a neuropathy and myopathy panel. - Biopsy of muscle or nerve if investigations conflict. Limits of this analysis: the sensory symptoms, the "painless burns" entry and the absence of examination findings are the main uncertainties. The ranking could change once reflexes and EMG are known. Q: Differentials in form of mnemonic vitamins all the causes possible A: Your credits are exhausted. You can purchase a top-up or subscribe to a plan to continue using Orris. If you're already subscribed, your daily credits will reset tomorrow.
