A 31-year-old woman with established relapsing multiple sclerosis presents with new left-leg weakness and sensory disturbance lasting 48 hours. She has no fever, urinary symptoms, or other evidence of infection. MRI demonstrates a new enhancing demyelinating lesion corresponding to her symptoms. She is significantly impaired in walking. Which treatment is most appropriate for the acute relapse?

A 45-year-old man presents with progressive tingling and weakness in both feet. Over ten days, his weakness ascends to involve the thighs and hands. Examination reveals generalized areflexia and predominantly distal weakness. Nerve conduction studies support acute inflammatory demyelinating polyradiculoneuropathy. During observation, he develops a weak cough, difficulty counting beyond eight on a single breath, and declining forced vital capacity. Which complication is the most immediate priority?

A 74-year-old man taking anticoagulation for atrial fibrillation presents with increasing confusion, headache, and progressive right-sided weakness. His family recalls a minor fall three weeks earlier. CT brain reveals a crescent-shaped hypodense extra-axial collection over the left cerebral hemisphere with associated mass effect. Which diagnosis is most likely?

A 67-year-old man recovering from an ischemic stroke is reviewed before discharge. He has persistent mild right-hand weakness. Investigations reveal nonvalvular atrial fibrillation, preserved renal function, and no contraindication to anticoagulation. Brain imaging demonstrates a small infarct without hemorrhagic transformation. He has hypertension and diabetes mellitus. Which long-term strategy provides the most appropriate prevention of recurrent cardioembolic stroke?

A 16-year-old boy is evaluated for frequent ankle sprains, difficulty running, and progressive foot deformity. His father and paternal grandmother experienced similar problems. Examination reveals bilateral pes cavus, distal calf muscle wasting, weakness of ankle dorsiflexion, reduced ankle reflexes, and impaired distal vibration sensation. Nerve conduction studies reveal markedly slowed conduction velocities. Which diagnosis best explains the findings?

A 30-year-old woman recently diagnosed with multiple sclerosis reports that her neurological symptoms become temporarily worse after exposure to high environmental temperatures. She notices increased fatigue and leg weakness after taking a hot bath, with improvement after cooling. There are no new symptoms lasting more than 24 hours and no evidence of infection. Which explanation best accounts for this phenomenon?

A 59-year-old man with longstanding poorly controlled diabetes presents with gradually progressive burning sensations in both feet, worse at night. He reports difficulty sensing the ground while walking. Examination reveals reduced pinprick and vibration sensation in a stocking distribution, absent ankle reflexes, and preserved proximal muscle power. Nerve conduction studies demonstrate a length-dependent axonal sensorimotor polyneuropathy. Which diagnosis is most likely?

A 29-year-old woman presents with recurrent intrusive thoughts that her hands are contaminated despite repeatedly washing them. She spends approximately three hours daily performing elaborate washing rituals, recognizes that these behaviors are excessive, and experiences severe anxiety when attempting to resist them. Her occupational performance has deteriorated. There is no evidence of psychosis, substance misuse, or neurological disease. Which intervention is the most appropriate first-line psychological treatment?

A 72-year-old man with moderate Alzheimer's disease has become increasingly dependent on his daughter for medication administration, financial decisions, and household activities. He occasionally wanders outside and forgets to turn off the stove. His daughter reports severe caregiver exhaustion and asks whether medication alone can resolve these problems. Which management plan is most appropriate?

A 55-year-old man develops progressive gait instability, slurred speech, and difficulty performing coordinated movements. Examination demonstrates a broad-based gait, horizontal gaze-evoked nystagmus, intention tremor, dysdiadochokinesia, and overshooting during finger-to-nose testing. Muscle strength and primary sensation are preserved. Which anatomical region is most likely responsible for the predominant neurological deficits?

A 43-year-old man develops progressive symmetrical weakness of both legs five days after recovering from a diarrheal illness. Weakness rapidly progresses to the upper limbs. Examination reveals flaccid weakness, absent deep tendon reflexes, and mild distal paresthesias. His respiratory rate is 24/min, and he is beginning to have difficulty coughing effectively. CSF demonstrates elevated protein with only two leukocytes/µL. Which treatment is most appropriate?

A 39-year-old woman develops progressive numbness and weakness of the feet over ten weeks, followed by difficulty climbing stairs and gripping objects. Examination demonstrates symmetrical proximal and distal weakness, generalized areflexia, and impaired vibration sensation. Nerve conduction studies show markedly prolonged distal motor latencies, reduced conduction velocities, and conduction block, consistent with acquired demyelination. Which diagnosis is most likely?

A newborn is diagnosed with an open lumbosacral myelomeningocele shortly after delivery. The infant has reduced lower-limb movements but is breathing spontaneously and has stable vital signs. The exposed neural placode is vulnerable to trauma, drying, and contamination. A pediatric neurosurgical team is being contacted. Which immediate management measure is most appropriate?

A 49-year-old woman develops a sudden explosive headache while exercising, describing it as the worst headache of her life. She vomits twice and briefly loses consciousness. Examination demonstrates neck stiffness without focal weakness. Noncontrast CT performed 18 hours after symptom onset is negative. Clinical suspicion for subarachnoid hemorrhage remains high. Which investigation is most appropriate to further evaluate suspected subarachnoid hemorrhage in this context?

A 27-year-old woman experiences recurrent unilateral throbbing headaches lasting approximately 12 hours, accompanied by nausea, photophobia, and worsening pain during routine activity. She reports similar attacks five times monthly. Neurological examination is normal between episodes. She has no cardiovascular disease, is not pregnant, and has no red-flag symptoms. Simple analgesics have provided inadequate relief. Which medication is most appropriate for acute treatment of a moderate-to-severe migraine attack?

A 56-year-old man presents with three weeks of headache, intermittent fever, and progressive left-sided weakness. He has a history of untreated dental infection. MRI brain reveals a right frontal ring-enhancing lesion with surrounding vasogenic edema and restricted diffusion within the lesion cavity. Laboratory investigations demonstrate leukocytosis and elevated inflammatory markers. Which diagnosis is most likely?

A 23-year-old woman with epilepsy attends a preconception consultation. She has been seizure-free for two years while taking sodium valproate for generalized tonic-clonic seizures. She plans pregnancy within the next six months and asks whether she should stop medication immediately. There is no history of status epilepticus. Which recommendation is most appropriate?

A 35-year-old emergency worker survived a major road traffic collision four months ago. Since the event, he experiences recurrent distressing dreams, intrusive memories, exaggerated startle responses, emotional withdrawal, and avoidance of driving. He feels persistently threatened despite being physically safe. His symptoms interfere with work and family relationships. There is no current substance misuse or psychosis. Which diagnosis best explains this presentation?

A 17-year-old girl is referred because of progressive shoulder asymmetry and abnormal posture. On posterior inspection, the right shoulder is elevated, and the waist triangles are unequal. Adam's forward bend test demonstrates a prominent right thoracic rib hump. Standing spinal radiographs confirm a structural right thoracic scoliosis with a Cobb angle of 38°. Skeletal maturity assessment indicates substantial growth remaining. Which management option is most appropriate?

A 26-year-old man with known epilepsy is brought to the emergency department after continuous generalized tonic-clonic activity for approximately eight minutes. His relatives report that he missed antiseizure medication for three days. On arrival, he remains convulsing, oxygen saturation is 89%, and intravenous access has been established. Bedside blood glucose is normal. Which pharmacological intervention is the most appropriate immediate treatment?

A 69-year-old retired businessman is brought for evaluation of progressive cognitive decline. Over the preceding year, he has experienced marked fluctuations in alertness, vivid visual hallucinations of unfamiliar people, and increasing difficulty performing daily activities. His wife reports that he frequently acts out dreams during sleep. Examination demonstrates bradykinesia, mild rigidity, and reduced facial expression. The family reports that his confusion worsened considerably after receiving haloperidol during an earlier hospital admission. Which diagnosis most appropriately explains the overall presentation?

A 72-year-old retired teacher is brought by his daughter because of progressive forgetfulness over three years. He repeatedly asks the same questions, misplaces household objects, and recently became lost while walking to a familiar shop. His daughter has taken over his financial responsibilities. Examination reveals impaired delayed recall, poor orientation to time, and difficulty copying intersecting pentagons. Neurological examination is otherwise normal. His MMSE score is 19/30. Routine blood investigations and thyroid function are normal. Which diagnosis most appropriately explains the clinical presentation?

A 64-year-old hypertensive man arrives 90 minutes after developing sudden right-sided weakness and inability to speak. Examination shows right facial weakness, right arm power 1/5, right leg power 3/5, and nonfluent aphasia. Blood glucose is normal. His NIHSS score is 15. Noncontrast CT brain shows no hemorrhage, and CT angiography reveals no large-vessel occlusion. Blood pressure is 174/96 mmHg. There are no contraindications to intravenous thrombolysis. Which management is most appropriate?

A 28-year-old woman with suspected meningitis undergoes lumbar puncture. CSF examination reveals leukocytes 160/µL, predominantly lymphocytes, protein 58 mg/dL, and glucose 68 mg/dL with simultaneous blood glucose 105 mg/dL. Gram stain is negative. She has fever, headache, and photophobia, but remains alert without focal neurological deficits. Which diagnosis is most consistent with the CSF profile?

A 34-year-old man reports recurrent episodes beginning with an unusual rising epigastric sensation and intense fear, followed by behavioral arrest and repetitive lip-smacking movements. Each episode lasts approximately 90 seconds, followed by several minutes of confusion. MRI demonstrates subtle left hippocampal sclerosis. Which seizure classification best fits these episodes?

A 62-year-old hypertensive man presents with sudden right-sided weakness and speech difficulty. Examination demonstrates right facial weakness, right arm power 2/5, right leg power 3/5, and expressive aphasia. His eyes preferentially deviate toward the left. CT brain excludes hemorrhage, and subsequent imaging demonstrates an acute infarct involving the left lateral frontal and parietal regions. Which vascular territory is most likely involved?

A 2-day-old newborn is examined because of a midline swelling over the lumbosacral region. The swelling is covered by a thin membrane through which neural tissue is visible. Examination reveals reduced spontaneous movements of both lower limbs and bilateral foot deformities. The infant is otherwise hemodynamically stable. Which diagnosis is most likely?

A 68-year-old man presents with progressive gait difficulty, hand clumsiness, and repeated falls over eight months. Examination reveals brisk knee reflexes, bilateral extensor plantar responses, impaired fine finger movements, and a positive Hoffmann sign. He also has chronic neck stiffness. MRI demonstrates multilevel cervical spondylotic changes causing significant spinal cord compression. Which diagnosis is most likely?

A 32-year-old man presents with three weeks of low-grade fever, progressive headache, weight loss, and intermittent vomiting. Examination reveals mild confusion, neck stiffness, and a right sixth cranial nerve palsy. MRI demonstrates basal meningeal enhancement and early communicating hydrocephalus. CSF analysis shows lymphocytic pleocytosis, elevated protein, and markedly reduced glucose. Which diagnosis is most likely?

A 38-year-old man undergoes neurosurgical treatment for a traumatic intracranial hematoma. At discharge, he is alert, mobilizing with assistance, and has mild residual headache. His wife asks which symptoms should prompt urgent reassessment during recovery at home. Which advice is most appropriate?

A 44-year-old accountant develops progressive irritability, involuntary irregular movements of his upper limbs, difficulty concentrating, and deterioration in professional performance. His father experienced similar symptoms in his forties and died after developing severe cognitive impairment. Examination reveals choreiform movements, impaired executive function, and abnormal saccadic eye movements. Genetic analysis identifies an expanded CAG repeat in the HTT gene. Which neuropathological alteration is most characteristic of this condition?

A 58-year-old man with diabetes is discovered unconscious at home. He has no witnessed seizure activity or history of head injury. Examination shows a GCS of 7/15, pulse 108/min, and blood pressure 130/80 mmHg. His airway is being supported, and bedside capillary glucose is 32 mg/dL. What is the most appropriate immediate intervention?

A 5-year-old child presents with fever, headache, repeated vomiting, and reduced consciousness. Examination reveals a GCS of 10/15, right-sided weakness, and an abnormal pupillary response. The clinician suspects bacterial meningitis and considers lumbar puncture. Which approach is most appropriate?

A 30-year-old man is diagnosed with tuberculous meningitis after presenting with fever, headache, cranial nerve palsy, and CSF findings consistent with tuberculosis. Standard multidrug antituberculous therapy is initiated. His family asks why the treatment team has added corticosteroids despite the infection being bacterial. Which explanation best supports adjunctive corticosteroid therapy?

A 66-year-old man presents with progressive slowing of movements over two years. His wife notices reduced facial expression, smaller handwriting, difficulty turning while walking, and reduced right arm swing. Examination demonstrates an asymmetric resting tremor, cogwheel rigidity, and bradykinesia. There are no early falls, vertical gaze abnormalities, or severe autonomic symptoms. His activities of daily living are significantly affected. Which medication is most appropriate for initial symptomatic management?

A 48-year-old woman presents to a primary healthcare clinic with a new severe headache. She has no previous history of similar headaches. The pain began suddenly during physical exertion and reached maximum intensity within one minute. She has vomited twice and reports neck discomfort. Neurological examination is nonfocal, but she appears distressed. Which next step is most appropriate?

A 21-year-old university student develops high-grade fever, severe headache, vomiting, and neck stiffness over 12 hours. Examination reveals temperature 39.5°C, photophobia, and a positive Kernig sign. He is alert, has no focal neurological deficits, and has no papilledema. Lumbar puncture reveals an opening pressure of 28 cm H₂O, CSF leukocytes 2,400/µL predominantly neutrophils, elevated protein, and CSF glucose 22 mg/dL with simultaneous blood glucose 110 mg/dL. Which diagnosis is most consistent with these findings?

A 68-year-old man is evaluated for worsening memory and concentration over six months. His wife reports that he walks slowly, has become increasingly forgetful, and occasionally experiences urinary urgency with incontinence. Examination demonstrates a broad-based, magnetic gait with difficulty initiating steps. Brain MRI reveals disproportionate enlargement of the lateral ventricles without an obstructing mass. Which investigation would be most useful in predicting potential improvement following CSF diversion?

A 7-month-old infant is brought because of progressive enlargement of the head. The mother reports increasing irritability, poor feeding, and vomiting. Examination reveals head circumference crossing upward through major centile lines, a tense bulging anterior fontanelle, widened cranial sutures, and downward deviation of the eyes. Cranial ultrasound demonstrates ventricular enlargement. Which underlying process most appropriately explains these findings?

A 46-year-old man presents with gradually progressive morning headaches, repeated vomiting, and a first episode of generalized seizure. His wife reports subtle personality changes over the previous four months. Examination reveals mild left-sided weakness and bilateral papilledema. MRI brain demonstrates a right frontal intra-axial mass with surrounding vasogenic edema and mass effect. Which diagnostic step is most appropriate for establishing the definitive tumor type?

A 28-year-old woman develops progressive numbness and weakness of both lower limbs over four days. Eight months earlier, she experienced painful loss of vision in her right eye that improved over several weeks. Examination reveals bilateral pyramidal weakness, brisk knee reflexes, extensor plantar responses, and impaired vibration sensation. MRI brain demonstrates several ovoid periventricular lesions, while spinal MRI shows a short-segment cervical demyelinating lesion. CSF contains oligoclonal bands restricted to CSF. Which diagnosis is most likely?

A 23-year-old woman presents with sudden severe headache, fever, photophobia, and vomiting. Examination demonstrates marked neck stiffness. Her blood pressure is 110/70 mmHg, GCS is 15/15, and there are no focal neurological deficits or papilledema. The clinician suspects acute bacterial meningitis. Blood cultures have been obtained, but lumbar puncture will be delayed because of logistical difficulties. Which management decision is most appropriate?

A 35-year-old man reports progressive difficulty walking and loss of pain sensation over both shoulders and upper limbs. Examination reveals impaired pain and temperature sensation across the upper limbs in a cape-like distribution, with relative preservation of vibration and joint-position sense. There is wasting of small hand muscles and reduced upper-limb reflexes. MRI cervical spine demonstrates a fluid-filled cavity extending through the central spinal cord. Which mechanism best explains the sensory pattern?

A 76-year-old woman with established dementia is brought to the emergency department because of sudden confusion, agitation, and visual misperceptions over the preceding 24 hours. Her son reports that she was previously able to recognize family members and participate in simple conversations. Examination reveals fluctuating attention, disorientation, a temperature of 38.6°C, and suprapubic tenderness. Urinalysis shows pyuria and bacteriuria. Which explanation best accounts for her acute behavioral deterioration?

A 50-year-old man is brought after a fall from a height. On arrival, his GCS is 8/15, blood pressure 92/60 mmHg, pulse 118/min, and oxygen saturation 89% on room air. Examination reveals a scalp wound and a sluggishly reactive right pupil. Cervical spine injury has not been excluded. The trauma team prepares for urgent CT imaging. Which initial management approach is most appropriate to reduce secondary neurological injury?

A 71-year-old woman taking haloperidol for a psychiatric disorder develops progressive bilateral hand tremor, reduced facial expression, rigidity, and slow walking. Her symptoms began several weeks after the antipsychotic dose was increased. Examination reveals relatively symmetrical rigidity and bradykinesia without a prominent asymmetric resting tremor. Which management approach is most appropriate?

A 9-year-old girl is evaluated for frequent episodes of suddenly stopping her activities and staring blankly for approximately 10 seconds. During these episodes, she does not respond to her teacher, but resumes activity immediately afterward without confusion. Hyperventilation during examination reproduces an episode. EEG demonstrates generalized 3-Hz spike-and-wave discharges. Which medication is the most appropriate initial choice for isolated absence seizures?

A 7-year-old child is referred because of delayed social communication and repetitive behaviors. His parents report limited reciprocal conversation, poor understanding of social cues, intense interest in specific objects, and marked distress when daily routines change. These difficulties were evident during early childhood and affect school functioning. Hearing assessment is normal. Which additional finding would most strongly support autism spectrum disorder?

A 19-year-old man is brought following a motorcycle collision. He briefly lost consciousness, became alert and conversed with his relatives, but subsequently developed severe headache, vomiting, and rapidly worsening consciousness. Examination reveals a dilated left pupil and right-sided weakness. CT brain demonstrates a biconvex hyperdense extra-axial collection in the left temporoparietal region with midline shift. Which management is most appropriate?

A 42-year-old office worker presents with acute low back pain radiating down the posterior aspect of his right leg after lifting a heavy object. He describes new difficulty passing urine and numbness around the perineum. Examination demonstrates reduced anal tone, bilateral lower-limb weakness, and sensory loss in the saddle region. Which management approach is most appropriate?

A 42-year-old woman is brought with fever, confusion, personality changes, and a new focal seizure. Examination reveals impaired short-term memory and disorientation. MRI demonstrates increased T2/FLAIR signal in the medial temporal lobes. CSF shows lymphocytic pleocytosis, and the treating team suspects herpes simplex encephalitis. Which treatment should be initiated promptly while confirmatory investigations are pending?

A 52-year-old man develops progressive lower-limb weakness, stiffness, and difficulty walking over six weeks. Examination demonstrates bilateral lower-limb spasticity, increased knee and ankle reflexes, extensor plantar responses, and a sensory level around the umbilicus. He also reports new urinary urgency. Upper-limb neurological examination is normal. Which investigation is most appropriate to identify the underlying cause?

A 27-year-old woman presents with bilateral leg weakness after developing painful visual loss in one eye. MRI spinal cord reveals a longitudinally extensive inflammatory lesion spanning five vertebral segments. Serum testing is positive for aquaporin-4 IgG antibodies. Brain MRI does not demonstrate typical multiple sclerosis lesions. Which diagnosis is most strongly supported?

A 37-year-old woman attends a family medicine clinic with persistent sadness, reduced energy, insomnia, impaired concentration, and loss of interest in daily activities over three months. She has experienced two previous depressive episodes and responded well to medication. She denies current suicidal intent, has no manic history, and has no psychotic symptoms. Following shared decision-making, her physician considers antidepressant therapy. Which treatment approach is most appropriate?

A 24-year-old man with known epilepsy has recurrent generalized tonic-clonic seizures without regaining consciousness between episodes. Intravenous lorazepam has been administered twice at appropriate doses, but convulsions continue. Airway support, oxygenation, intravenous access, and glucose assessment have been completed. Approximately 15 minutes have elapsed since seizure onset. Which pharmacological step is most appropriate next?

A 61-year-old man is brought after suddenly collapsing at home. He opens his eyes only in response to painful stimulation. He produces incomprehensible sounds and withdraws his upper limb from a painful stimulus. Pupils are equal and reactive. What is his Glasgow Coma Scale score?

A 57-year-old woman with poorly controlled hypertension develops sudden headache, vomiting, and left-sided weakness. Blood pressure is 218/118 mmHg. CT brain reveals an acute right putaminal hemorrhage. Her GCS is 13/15, and repeat examination shows no immediate deterioration. She has no history of anticoagulant use. Which intervention is most appropriate during initial management?

A 46-year-old man with longstanding heavy alcohol consumption is admitted for acute pancreatitis. Approximately 48 hours after his last alcoholic drink, he develops severe agitation, disorientation, visual hallucinations, sweating, and generalized tremors. His pulse is 126/min, blood pressure 170/100 mmHg, and temperature 38.1°C. He is unable to maintain attention during examination. Which treatment approach is most appropriate?

A 32-year-old woman attends a primary healthcare clinic with persistent fatigue, reduced appetite, poor sleep, and loss of interest in previously enjoyable activities for nine weeks. She has stopped attending social gatherings and finds it difficult to care for her children. During consultation, she states, "Sometimes I feel my family would be better without me." Her physician suspects a depressive episode. What is the most appropriate immediate next step in her assessment?

A 33-year-old woman with known relapsing multiple sclerosis presents with three days of worsening leg weakness and urinary frequency. She reports no new visual disturbance or sensory symptoms. Examination demonstrates neurological findings similar to those documented at her previous clinic visit. She has a temperature of 38.3°C, and urinalysis reveals positive nitrites, leukocyte esterase, and significant pyuria. Which explanation and management approach are most appropriate?