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J Korean Soc Radiol. 2017 Aug;77(2):129-132. English. Case Report. https://doi.org/10.3348/jksr.2017.77.2.129
Kang DJ , Lee SJ , Kim SJ .
Department of Radiology, Inje University College of Medicine, Busan Paik Hospital, Busan, Korea. sunjulee98@naver.com
Center for Fishermen's Safety & Health, Inje University College of Medicine, Busan Paik Hospital, Busan, Korea.
Department of Radiology, Hongcheon Asan Hospital, Hongcheon, Korea.
Abstract

Pilar sheath acanthoma is a rare benign follicular hamartoma that presents with a central sinus containing keratinous material and is lined by epithelium. It typically occurs on the face, especially on the upper lip and forehead. In our case, the ultrasound (US) feature of pilar sheath acanthoma revealed a well-defined, oval hypoechoic nodule with hypoechoic capping within the dermis over the medial aspect of the calf. To the best of our knowledge, despite many reports on the clinicopathological aspects of pilar sheath acanthoma, this entity has not been well described in the radiologic literature, and US findings have not been documented. We report the US findings of a case of pilar sheath acanthoma on the calf.

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