[Umbilical primary endometrioma. Case report].

The paper reports a rare case of primary umbilical endometrioma in a 36-year-old woman, presenting with an umbilical mass that showed cyclic characteristics including clear secretion around days 12–14 of the menstrual cycle and swelling with redness and spontaneous bleeding at the beginning of menses. Clinical suspicion was supported by these menstrual-linked changes and a transvaginal ultrasound without endopelvic lesions, while total-body CT (thorax-abdomen-pelvis) excluded associated extra-umbilical endometriosis, which the authors note occurs in about a quarter of cutaneous cases. The lesion was surgically excised with en bloc removal of the umbilicus, superficial and deeper periumbilical tissues, fascia, and peritoneum, with immediate reconstruction without mesh; histology confirmed endometriosis by showing endometrial glands and stroma with perilesional lymphoplasmacytic infiltrate. This paper is centrally about endometriosis — it focuses on primary umbilical endometrioma (cutaneous/external endometriosis).

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