Atypical MRI and Histopathological Findings in Dermoid Cyst.

This report describes a dermoid cyst in the floor of the mouth of a 55 year-old woman that showed an atypical internal appearance on MRI. Most of the lesion showed homogeneous high signal intensity on T1 - and T2-weighted images, suggesting that it was derived from fat. A small area within the mass, however, showed moderate signal intensity almost equal to that of muscle on T1-weighted images and high signal intensity on fat-suppressed T2-weighted images. Given the location of the lesion, a dermoid cyst was one possible diagnosis. A lipoma or lipoma variants were also considered, however, based on signal intensity. Histopathological section of the excised specimen revealed a dermoid cyst with sebaceous glands in its walls and keratin in its cavity. Dermoid cysts show variation in their internal structures and contents. Since MRI can reflect such histological variation, signal intensity requires careful interpretation.
PMID: 30224615 [PubMed - in process]

Source: The Bulletin of Tokyo Dental College - September 19, 2018 Category: Dentistry Authors: Otonari-Yamamoto M, Nakajima K, Sakamoto J, Imoto K, Watanabe M, Kotaki S, Kuroda M, Matsuzaka K, Shibahara T, D Curtin H, K Goto T Tags: Bull Tokyo Dent Coll Source Type: research