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Neuro

Neuro 22

14 May, 2026

INTERESTING CASES ARE BEST VIEWED ON A DESKTOP DEVICE

Patient presents with upper limb weakness and headache. What's the diagnosis?

Asymmetric cerebellar tonsillar ectopia is noted, the left cerebellar tonsil exerting mass effect on the upper cord and suggestive of a Chiari 1-type malformation. The superior extent of a syrinx can be viewed at the upper cord on coronal images

Test Your Knowledge

1. A patient presents with upper limb weakness and headache. Which anatomic region is most likely involved?

Sample answer. Contralateral upper limb weakness localises to the motor strip in the frontoparietal cortex.

Sample answer. Cerebellar lesions typically present with ataxia rather than isolated limb weakness.

Sample answer. Occipital lesions usually present with visual symptoms.

Sample answer. Brainstem lesions usually involve cranial nerve findings alongside weakness.

2. Which imaging sequence is most sensitive for early ischaemic change?

Sample answer. T1 lacks early sensitivity for acute ischaemia.

Sample answer. DWI is the most sensitive sequence for detecting cytotoxic oedema within minutes of an ischaemic insult.

Sample answer. CT can miss early ischaemia in the first few hours.