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• Vol.60 No.8
• CLINICA NEUROL, 60: 527−532, 2020
• Vol.60 No.8 contents

Case Report

Unilateral ptosis induced by pure midbrain infarction: a case report

Yuki Nakamura, M.D.¹⁾, Yoshinori Kurauchi, M.D.¹⁾²⁾, Akio Takahashi, M.D.¹⁾, Rika Yamauchi, M.D., Ph.D.¹⁾ and Shun Shimohama, M.D., Ph.D.³⁾

¹⁾ Department of Neurology, Sunagawa City Medical Center
²⁾ Department of Neurology, Hakodate Shintoshi Hospital
³⁾ Department of Neurology, Sapporo Medical University School of Medicine

We describe herein a case with left-side ptosis induced by pure midbrain infarction in a 49-year-old woman. She also presented with diplopia and right-side cerebellar ataxia. MRI demonstrated new ischemic stroke of the left ventral paramedian midbrain. In this case, ischemia of the left oculomotor fascicles caused the left-side ptosis and diplopia, and ischemia of the left decussation of the superior cerebellar peduncle caused the right-side cerebellar ataxia. These symptoms resulted from inner superior medial mesencephalic branch infraction. This case offers an educational example that can be explained by models proposed in the past and requires knowledge of neuroanatomy and cerebrovasculature.
Full Text of this Article in Japanese PDF (3965K)

(CLINICA NEUROL, 60: 527−532, 2020)
key words: ptosis, decussation of the superior cerebellar peduncle, neuroanatomy, midbrain infarction, oculomotor fascicles

(Received: 27-Nov-19)