Decidualized Scar Endometriosis in a Non Pregnant Woman: Case Report

Cutaneous endometriosis is a rare condition affecting about 1.6 % of proven endometriosis in scars. It may undergo any metaplastic, hyperplastic or even atypical changes, making the histological diagnosis from very clear and simple with the presence of endometrial glands and stroma, to difficult and sometimes even challenging. The literature has describe the case reports of many metaplastic changes, one of them decidualization of endometriosis, occurring during pregnancy or even under the progesterone replacement therapy. Ectopic endometrial glands and stroma responds exactly as eutopic one under progesterone stimulation. Here we will represent an unusual case of a non pregnant woman, diagnosed with decidualized scar endometriosis, in the absence of progresteron stimulus. The cells alterations and other clinical features made the differential diagnosis difficult from the malignant mesothelioma and metastatic squamous carcinoma.