Claude Syndrome: Clinical Signs
The defining clinical features presented are:
- Ipsilateral 3rd cranial nerve (CN III) palsy: Affects the eye on the same side as the lesion (e.g., ptosis, abnormal eye movements).
- Contralateral cerebellar signs: Impaired coordination or balance on the opposite side of the body.
This specific combination indicates a lesion in the upper brainstem (midbrain), affecting structures like the superior cerebellar peduncle and the oculomotor nerve (CN III) pathways.
Identifying Claude Syndrome
Claude syndrome is characterized by this exact set of signs: ipsilateral $CN III$ palsy and contralateral cerebellar ataxia. The lesion's location in the midbrain explains the involvement of both the $CN III$ nerve structures and the crossing cerebellar tracts or nuclei.
Distinguishing from other syndromes:
- Weber syndrome involves ipsilateral CN III palsy but contralateral hemiparesis (due to cerebral peduncle lesion).
- Wallenberg syndrome affects the lateral medulla with a different symptom cluster.
- Parinaud syndrome primarily involves vertical gaze palsy.
Therefore, the specific combination of ipsilateral $CN III$ palsy and contralateral cerebellar signs points directly to Claude syndrome.
Important Questions from Stroke
- Transient Monocular blindness may be due to small platelet emboli that occludes:
- The phenomenon of sparing of macular vision is due to collateral circulation between:
- The commonest cause for new-onset seizures in patients older than 65 years is:
- Incongruous contralateral homonymous hemianopia is due to lesion at:
A 56-year old man presented with acute onset aphasia. Speech output was markedly reduced with preserved comprehension of spoken language. The area of brain involved is:
