Welcome to your 6. 🦠 CNS Infections: Meningitis & Encephalitis with Meningitis Clinical Long Case Arena — 40 Integrated MCQs
1.
A 30-year-old man treated for tuberculous meningitis returns for follow-up after several weeks. His headache has improved, but he reports persistent fatigue and has independently stopped taking his medications because he feels considerably better. Which counselling principle is most important?
2.
A 5-month-old infant presents with fever, irritability and reduced feeding. There is no obvious neck stiffness. The infant has become progressively less responsive during the preceding six hours. What is the most appropriate interpretation of the absent neck stiffness?
3.
A 42-year-old patient with suspected tuberculous meningitis undergoes contrast-enhanced MRI. Imaging shows basal meningeal enhancement and an area of restricted diffusion in the internal capsule. The patient has recently developed unilateral weakness. Which mechanism most likely explains the focal neurological deficit?
4.
A 44-year-old man with tuberculous meningitis has been receiving appropriate therapy. Despite treatment, he develops progressive drowsiness, vomiting and papilledema. Neuroimaging demonstrates enlargement of the lateral and third ventricles due to impaired CSF circulation. Which intervention may become necessary if clinically significant hydrocephalus persists?
5.
A 22-year-old man with acute meningitis undergoes lumbar puncture after appropriate clinical assessment. CSF is turbid, with 1,800 white cells/µL, 90% neutrophils, protein 180 mg/dL and glucose 25 mg/dL. Simultaneous blood glucose is 100 mg/dL. Which interpretation best integrates these findings?
6.
A 34-year-old woman presents with fever, headache, disorientation and recurrent focal seizures. Her CSF contains predominantly lymphocytes, and MRI reveals inflammatory changes in the medial temporal region. Which investigation would provide the most specific etiological confirmation?
7.
A 46-year-old man presents with high-grade fever, severe headache, neck stiffness and confusion for 18 hours. CSF examination reveals 1,800 cells/µL with 92% neutrophils, protein 240 mg/dL and glucose 18 mg/dL, while simultaneous blood glucose is 110 mg/dL. Which mechanism best explains the predominant CSF cellular response?
8.
A 51-year-old man presents with fever, progressive confusion, abnormal behavior and seizures. MRI suggests encephalitis. Intravenous antiviral treatment is started while awaiting confirmatory investigations. Which pharmacological mechanism explains the action of the medication used for suspected herpesvirus infection?
9.
A 64-year-old man with pneumococcal meningitis initially improves with treatment. On the third hospital day, he develops worsening consciousness and new-onset seizures. Repeat imaging demonstrates diffuse cerebral swelling. Which pathophysiological consequence is most likely responsible for his neurological deterioration?
10.
A 30-year-old man presents with three weeks of headache, low-grade fever, vomiting and progressive drowsiness. CSF shows predominantly lymphocytic pleocytosis, markedly elevated protein and reduced glucose. MRI demonstrates basal meningeal enhancement with hydrocephalus. Which interpretation best integrates these findings?
11.
A previously healthy 22-year-old man is admitted with suspected community-acquired bacterial meningitis. He has high fever, neck rigidity and impaired consciousness. There is no known immunodeficiency or specific risk factor for Listeria infection. Which antimicrobial approach is most appropriate initially?
12.
A 39-year-old man is receiving treatment for tuberculous meningitis. After several weeks, he develops nausea, loss of appetite, dark urine and jaundice. Liver enzymes are markedly elevated. Which clinical action is most appropriate?
13.
A 25-year-old man presents with sudden severe headache, vomiting and neck stiffness. The headache reached maximum intensity within seconds while he was exercising. He has no preceding febrile illness. His temperature is normal, but he appears distressed. Which alternative diagnosis must be urgently considered before attributing the symptoms to meningitis?
14.
A 21-year-old university student develops fever, headache, vomiting and a rapidly spreading non-blanching purpuric rash. He becomes hypotensive shortly after arriving at the emergency department. Which complication is most strongly suggested by this clinical deterioration?
15.
A 22-year-old hostel resident is diagnosed clinically with acute bacterial meningitis. CSF demonstrates neutrophilic pleocytosis, elevated protein and reduced glucose. Gram staining reveals Gram-negative diplococci. Which causative organism is most strongly suggested by this combination of findings?
16.
A 28-year-old man presents with headache, fever and vomiting for 18 days. He reports progressive weight loss, night sweats and increasing difficulty concentrating. His family notices intermittent double vision. Examination reveals neck stiffness and a right sixth cranial nerve palsy. Which diagnosis best explains this clinical pattern?
17.
A 3-year-old child is brought with fever, irritability and repeated vomiting. Examination reveals lethargy and neck discomfort. Bacterial meningitis is suspected, but the child develops a prolonged seizure during the initial assessment. Which management priority is most appropriate?
18.
A 60-year-old patient with bacterial meningitis receives intravenous antibiotics and supportive treatment. During monitoring, his blood pressure falls, urine output decreases and serum lactate rises. Which systemic complication should be suspected?
19.
A 21-year-old man presents with fever, headache and neck stiffness. Lumbar puncture reveals clear CSF with 180 white cells/µL, predominantly lymphocytes, mildly elevated protein and normal CSF glucose relative to blood glucose. He remains alert and hemodynamically stable. Which diagnosis is most consistent with this investigation pattern?
20.
A 23-year-old man presents with fever, severe headache and photophobia. Examination reveals resistance to passive neck flexion. When his hip is flexed, extension of the knee produces pain and resistance. Which interpretation of this examination finding is most appropriate?
21.
A 21-year-old man presents with fever, severe headache, vomiting and neck stiffness. He shares a university hostel room with three other students. The physician specifically asks about similar illnesses among his roommates and recent close contact with anyone diagnosed with meningitis. What is the main clinical significance of this information?
22.
A 22-year-old man with suspected meningitis is febrile and drowsy. He opens his eyes when spoken to, answers questions appropriately and obeys commands. There is no focal neurological deficit. Which Glasgow Coma Scale score most accurately represents his level of consciousness?
23.
A 22-year-old man with confirmed bacterial meningitis is receiving appropriate intravenous antibiotics. Twelve hours after admission, his GCS decreases from 14/15 to 10/15, and he develops a new focal neurological deficit. Which action is the most appropriate immediate response?
24.
A 22-year-old university student is diagnosed with meningococcal meningitis following CSF molecular testing. He shares a hostel room with two other students, and his family has been visiting him closely. Which additional management action is most appropriate?
25.
A 24-year-old man is admitted with suspected acute bacterial meningitis. Initially, he is alert with neck stiffness and fever. Several hours later, he becomes increasingly drowsy and develops unequal pupils and weakness of his left arm. Which clinical interpretation is most appropriate?
26.
A 37-year-old woman presents with three weeks of headache, low-grade fever, vomiting and progressive drowsiness. CSF analysis shows 180 cells/µL with lymphocyte predominance, elevated protein and a CSF-to-blood glucose ratio of 0.25. Contrast-enhanced MRI demonstrates basal meningeal enhancement. Which pathological process best explains these combined findings?
27.
A 23-year-old woman presents with fever, severe headache and neck discomfort. CSF examination demonstrates a lymphocytic predominance, mild protein elevation and preserved glucose concentration. She remains alert, has no focal neurological deficit and is hemodynamically stable. Once bacterial and other serious causes have been appropriately excluded, which management approach is most suitable?
28.
A 22-year-old university student living in a hostel presents with high-grade fever, severe diffuse headache and repeated vomiting for two days. His family reports increasing neck stiffness and drowsiness during the last six hours. Which additional historical feature would most strongly support an acute bacterial rather than tuberculous meningitis presentation?
29.
A 48-year-old man is diagnosed with tuberculous meningitis. Contrast MRI shows inflammatory exudates surrounding the basal cisterns. Two days later, he develops diplopia and examination reveals impaired lateral movement of the right eye. Which anatomical structure is most likely affected?
30.
A 32-year-old woman is admitted with suspected bacterial meningitis. CSF culture later identifies Streptococcus pneumoniae. The patient initially received empirical broad-spectrum antimicrobial therapy. What is the most appropriate subsequent treatment principle?
31.
A 22-year-old man presents with fever, severe headache, vomiting and neck stiffness. Acute bacterial meningitis is strongly suspected. He is drowsy, and the clinical team decides that lumbar puncture requires further safety assessment. Blood cultures have been obtained without delaying care. Which management decision is most appropriate?
32.
A 22-year-old university student has completed treatment for confirmed bacterial meningitis. His fever and neck stiffness have resolved, and he is neurologically stable. At discharge, he reports occasional difficulty hearing conversations that was not present before the illness. Which follow-up action is most appropriate?
33.
A 22-year-old hostel resident develops high-grade fever, severe headache, vomiting, photophobia and neck stiffness over two days. Examination reveals temperature 39.2°C, tachycardia, positive meningeal signs and GCS 14/15. There is no prolonged history of weight loss or night sweats. Which diagnosis is most likely at initial assessment?
34.
A 58-year-old man is admitted with suspected meningitis. He has fever, neck stiffness and a Glasgow Coma Scale score of 13. Blood cultures are collected, but lumbar puncture is delayed because of concern about an intracranial complication. Empirical treatment has already been initiated. Which additional diagnostic approach is most appropriate?
35.
A 24-year-old man presents with severe suspected bacterial meningitis. Intravenous antibiotics are being prepared. The treating physician considers adjunctive dexamethasone to reduce inflammatory complications. Which timing is most appropriate when dexamethasone is indicated?
36.
A 22-year-old man is being treated for meningococcal meningitis. He develops hypotension, cold extremities, worsening tachycardia and rapidly spreading purpuric lesions. Platelet count is falling, and coagulation studies are abnormal. Which complication best explains this deterioration?
37.
A 29-year-old man has persistent headache and low-grade fever for two weeks. CSF analysis shows predominantly lymphocytic pleocytosis and elevated protein. The laboratory reports a CSF glucose of 35 mg/dL, while simultaneous blood glucose is 100 mg/dL. Which additional interpretation is most appropriate?
38.
A 7-year-old child recovers from severe bacterial meningitis and is discharged following appropriate treatment. At a follow-up visit, the parents report that the child struggles to understand classroom instructions and has declining school performance. Which follow-up assessment is most appropriate?
39.
A 36-year-old patient is being evaluated for suspected CNS infection. The patient has fever, headache and confusion. Before lumbar puncture, laboratory tests reveal severe thrombocytopenia with a platelet count of 18,000/µL. Which is the most appropriate clinical decision?
40.
A 23-year-old man presents with fever, headache and altered behavior. His family reports progressive confusion, recent abnormal emotional outbursts and a generalized seizure. Neck stiffness is mild. Which diagnosis should be considered particularly strongly because of the prominent cerebral dysfunction?