Asymptomatic Hypothalamic Hamartoma Associated with an Arachnoid Cyst —Case Report—

Toshihiko ISAKA; Susumu NAKATANI; Toshiki YOSHIMINE; Fumiharu AKAI; Mamoru TANEDA

doi:10.2176/nmc.36.725

Toshihiko ISAKA, Susumu NAKATANI, Toshiki YOSHIMINE, Fumiharu AKAI, Mamoru TANEDA

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Keywords: hypothalamic hamartoma, arachnoid cyst, heterotopic neuroglial tissue, magnetic resonance imaging

JOURNAL FREE ACCESS

1996 Volume 36 Issue 10 Pages 725-728

DOI https://doi.org/10.2176/nmc.36.725

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Abstract

A 42-year-old male presented with the complaint of mild left facial numbness. Magnetic resonance imaging demonstrated a solid tumor in the interpeduncular cistern and a huge arachnoid cyst in the left middle cranial fossa. The tumor appeared isointense to the surrounding cerebral gray matter on T₁-weighted images and hyperintense to that on T₂-weighted images. The tumor was partially resected. Histological findings were characteristic of hamartoma. The mild left facial numbness was probably due to compression of the left trigeminal nerve by the arachnoid cyst. Asymptomatic hypothalamic hamartomas may occur in adults with atypical clinical presentations.

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