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[Brainstem ptosis (midbrain ptosis) associated with mesencephalic hemorrhage]
K Iwanaga1, I Kinoshita, N Ohe
1Department of Internal Medicine, Yahata-city Hospital.
Rinsho Shinkeigaku = Clinical Neurology
|July 1, 1990
Summary
This study reports a rare case of brainstem ptosis caused by a midbrain hemorrhage. The patient experienced sudden eyelid drooping and double vision, linked to a small hematoma in the midbrain.
Area of Science:
- Neurology
- Neuroscience
- Ophthalmology
Background:
- Brainstem ptosis, specifically midbrain ptosis, is a rare clinical manifestation.
- Oculomotor nerve (cranial nerve III) dysfunction can lead to ptosis and diplopia.
Observation:
- A 57-year-old woman presented with acute onset bilateral blepharoptosis and diplopia.
- Neuroimaging revealed a small hematoma in the left tegmentum of the midbrain.
- The patient had no history of hypertension or head trauma.
Findings:
- The mesencephalic hemorrhage was identified as the cause of the patient's symptoms.
- The location of the lesion, potentially involving the central caudal subnucleus of the IIIrd nerve nucleus, explains the bilateral ptosis.
- Cerebral angiography did not reveal further information regarding the cause of the hemorrhage.
Implications:
- This case highlights the importance of considering midbrain lesions in the differential diagnosis of sudden onset ptosis and diplopia.
- The findings support current models of oculomotor organization and the role of specific neural pathways in controlling eyelid position.
- Further research into the neurovascular anatomy of the midbrain may elucidate the mechanisms behind such hemorrhages.