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Levator-sparing oculomotor nerve palsy caused by a solitary midbrain metastasis
Abstract:
One month before death, a 63-year-old man with known lung carcinoma manifested a left third-nerve palsy and crossed ataxia. The oculomotor involvement began with a dilated left pupil and progressed to a complete left oculomotor nerve palsy, with the exception of nearly normal lid function. Pathologic examination revealed a solitary midbrain metastasis involving the left third-nerve nucleus and rootlets, with the exception of the caudal central oculomotor subnucleus and its outflow fibers.
Insights
A brain metastasis from lung carcinoma caused third-nerve palsy and crossed ataxia in a patient. The tumor selectively impacted the left oculomotor nerve nucleus and rootlets, sparing specific subnuclei.
Area of Science:
- Neurology
- Oncology
- Pathology
Background:
- Lung carcinoma is a common malignancy with potential for distant metastasis.
- Neurological complications can arise from metastatic disease, affecting cranial nerves and brain structures.
Observation:
- A 63-year-old male with known lung carcinoma presented with left third-nerve palsy and crossed ataxia.
- Oculomotor symptoms included a dilated left pupil progressing to complete palsy, with preserved lid function.
Findings:
- Autopsy revealed a solitary midbrain metastasis.
- The metastasis involved the left third-nerve nucleus and rootlets, sparing the caudal central oculomotor subnucleus and its efferent fibers.
Implications:
- This case highlights the selective vulnerability of specific neural structures to metastatic infiltration.
- Understanding precise metastatic patterns is crucial for diagnosing and managing neurological paraneoplastic syndromes.