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Case Reports in Medicine
Volume 2016 (2016), Article ID 2487820, 5 pages
http://dx.doi.org/10.1155/2016/2487820
Case Report

Mullerian-Type Ciliated Cyst of the Thigh with PAX-8 and WT1 Positivity: A Case Report and Review of the Literature

1Department of Pathology and Laboratory Medicine, Children’s Hospital Los Angeles, Los Angeles, CA, USA
2Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA
3Department of Pathology, Queen Elizabeth Hospital, Bridgetown, Barbados
4Department of Surgery, Children’s Hospital Los Angeles, Los Angeles, CA, USA

Received 7 September 2016; Accepted 14 November 2016

Academic Editor: Christian Koch

Copyright © 2016 Corinthia Fabien-Dupuis et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mullerian-type ciliated cysts are uncommon lesions usually found in the lower extremities and perineal region of young females. They have however been reported in males and in other anatomic sites. The cyst lining is typically positive for estrogen receptor (ER), progesterone receptor (PR), PAX-8, and WT1 immunohistochemical stains. This staining pattern has led to the notion that these cysts are of Müllerian origin. The vast majority of cases are located in the dermis where the preferred nomenclature is cutaneous ciliated cyst (CCC). We report a case of Müllerian-type ciliated cyst in the thigh of a 16-year-old girl. Unlike most of the cases reported in the English literature, this cyst was not centered in the dermis. Only a few other cases of Müllerian-type ciliated cysts with no cutaneous connection have been reported. We propose the term ectopic Müllerian cyst for this rare subset of lesions that are not skin based as is the current case.