Answer to Image of the Month October 2014
Submitted by Inchara YK
Cutaneous endometriosis
Cutaneous endometriosis accounts for less than 1% cases of ectopic endometrial tissue. It is common in the umbilicus, surgical scars on lower abdomen and rarely occurs in the inguinal region, thigh and neck. Clinically, it presents as a bluish-black nodule and may be associated with discharge. Microscopically, it is composed of endometrial glands; some of which are dilated and contains debris and are surrounded by endometrial stroma. Hemosiderophages may be present. Although these may mimic apocrine lesions, the characteristic presence of endometrial stroma clinches the diagnosis.