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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 25:1538-1540, October 2004
© 2004 American Society of Neuroradiology

Case Report
BRAIN

Pineal Cystic Germinoma with Syncytiotrophoblastic Giant Cells Mimicking MR Imaging Findings of a Pineal Cyst

Yoshiko Hayashida^a, Toshinori Hirai^a, Yukunori Korogi^c, Masato Kochi^b, Noriko Maruyama^a, Masayuki Yamura^a and Yasuyuki Yamashita^a

^a Department of Radiology, Kumamoto University School of Medicine, Kumamoto, Japan
^b Department of Neurosurgery, Kumamoto University School of Medicine, Kumamoto, Japan
^c Department of Radiology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan

Address correspondence to Toshinori Hirai, MD, Department of Radiology, Kumamoto University School of Medicine, 1–1-one Honjo, Kumamoto 860-8556 Japan

Summary: We report a case of precocious puberty in a 4-year-old boy. Contrast-enhanced T1-weighted MR imaging suggested a pineal cyst with enhancement of the slightly thickened wall and focal wall irregularity. Three-dimensional constructive interference in a steady-state imaging revealed a focal lobulation and a nodule-like area in the lesion. The lesion mimicking a pineal cyst proved to be a germinoma with syncytiotrophoblastic giant cells, on the basis of biopsy and tumor marker results.

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