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MRI Findings of Subcutaneous Epidermal Cysts: Emphasis on the Presence of Rupture

¹ Department of Radiology, Seoul National University College of Medicine and Institute of Radiation Medicine, 28 Yeongon-dong, Chongno-gu, Seoul, South Korea.
² Department of Radiology, Samsung Medical Center, Sungkyunkwan University College of Medicine, 50 Ilwon-dong, Kangnam-gu, Seoul, South Korea.

OBJECTIVE. Our aim was to describe the MRI findings of subcutaneous epidermal cysts with an emphasis on determining the presence of rupture.

CONCLUSION. Epidermal cysts show a fluidlike signal with variable low-signal components on T2-weighted images and peripheral rim enhancement on gadolinium-enhanced images. Most ruptured cysts have septa, show thick and irregular rim enhancement, and are accompanied by a fuzzy enhancement in surrounding subcutaneous tissues. These imaging features of a ruptured epidermal cyst simulate a mass of infectious or neoplastic origin.

Keywords: extremities • MRI • subcutaneous epidermal cyst

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