Liver tumours due to endometriosis and endometrial stromal sarcoma

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Abstract
Background Endometriosis can occur in unusual sites, liver involvement being first described in 1986. Extra‐uterine malignant transformation in endometriosis has been reported, occurring mainly in the ovary. Liver involvement with endometrial stromal sarcoma (ESS) has not been previously reported. Case outline Two patients presenting with symptomatic liver masses related to endometriosis, who successfully underwent surgical intervention, are presented. Case 1A 31‐year‐old woman previously had been treated with hysterectomy and bilateral salpingooophorectomy for severe pelvic endometriosis. Six years later, she presented with malaise from bilobar liver involvement with endome trial deposits. She proceeded acutely to hilar obstruction with obstructive jaundice and portal vein thrombosis. Case 2A 59‐year‐old post‐menopausal woman had earlier presented acutely from a ruptured mesenteric cyst, which showed features of endometrial stromal sarcoma (ESS). Two years later, she presented with symptoms from a large ESS occupying the right lobe. Discussion Endometriosis perse, as well as malignant transformation into ESS can involve the liver. These should be considered in women with hepatic space occupying lesions of unknown aetilogy.

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