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Fluid‐fluid level in a giant epidermal cyst of the buttock
Author(s) -
TAKEMURA Noriko,
FUJII Norikazu,
SHIBATA Chikako,
KAWANO Akiko,
FUJIMOTO Noriki,
UENISHI Toshiaki,
TANAKA Toshihiro
Publication year - 2007
Publication title -
the journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 65
eISSN - 1346-8138
pISSN - 0385-2407
DOI - 10.1111/j.1346-8138.2007.00248.x
Subject(s) - epidermal cyst , magnetic resonance imaging , cyst , anatomy , medicine , tissue fluid , fistula , pathology , radiology
We describe a case of a giant epidermal cyst of the buttock that demonstrated a fluid‐fluid level on imaging. There have been no previously reported cases of epidermal cysts containing a fluid‐fluid level, so our case was considered to be very exceptional. A 39‐year‐old man had had a slowly enlarging giant subcutaneous mass in the left buttock for more than 10 years. It was elastic‐soft, well‐circumscribed and smooth‐surfaced. Ultrasonography showed a well‐circumscribed hypoechoic mass with a fluid‐fluid level in the subcutis of the left buttock. Magnetic resonance imaging (MRI) showed a well‐circumscribed cystic mass measuring 8 cm × 5.5 cm × 5.5 cm in the same place that the ultrasonography indicated. It was hypointense on the T1‐weighted image, hyperintense on the T2‐weighted image, and contained a fluid‐fluid level on both the T1‐ and T2‐weighted images. It bordered on the anus, but neither adhered nor formed a fistula with it. A surgical excision was performed. The mass was diagnosed histopathologically as an epidermal cyst. The occurrence of fluid‐fluid levels in epidermal cysts should be kept in mind in the differential diagnosis of subcutaneous soft tissue tumors.