[Extraperitoneal inguinal endometriosis]

The case report of the very rare, extraperitoneal endometriosis in the inguinal localisation in 40-year-old woman. Clinical diagnosis was confirmed by histological examination of the removed endometriotic focus. The main patient's complain was the pain in the groin during menses often accompanied with the feeling of dumbness of the ipsilateral leg. During menses the palpable tumor enlarged and was painful. The surgical excision of the tumor with broad margins is the best method of treatment. In differential diagnosis one should consider entrapped inguinal hernia as well as displaced ovary.