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Correspondence |

Umbilical Endometriosis With Urachal Remnant

Takehito Mizutani, MD; Yoshiaki Sakamoto, MD; Hiroko Ochiai, MD; Arafumi Maeshima, MD
Arch Dermatol. 2012;148(11):1331-1332. doi:10.1001/archdermatol.2012.1983.
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Umbilical endometriosis, also called Villar nodule, is an extremely rare type of endometriosis, with an incidence of 0.5% to 0.1% among women with extragonadal or external endometriosis.1 The urachus, a vestigial structure arising from the anterior bladder wall, is progressively destroyed with advancing age, but destruction does not occur in approximately 1 in 5000 individuals.2 This report describes a case of umbilical endometriosis that developed in the absence of previous abdominal or uterine surgery.

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Figure 1. Umbilical nodule (A) and intraoperative dissection of the urachus (B).

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Figure 2. Magnified biopsy specimens (original magnification ×200). A, The cord shows a tubular structure with transitional epithelium (hematoxylin-eosin). B, The dermal stroma expresses strong reactivity for the CD10 antigen (immunostaining for CD10 antigen).




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