A 41-year-old woman, gravid 3, para 3, was admitted to the Department of Obstetrics and Gynecology at Tsuchiura Kyodo General Hospital, complaining of a tender, gradually enlarging mass in the right inguinal region during menses. Examination found the mass was about 2 cm in diameter, which protruded slightly (on lying position?). During menstrual periods, the mass enlarged and the pain intensified, but between menses, the mass decreased in size and the pain subsided. The case was diagnosed as inguinal endometriosis and then a preoperative GnRH analog therapy was given for six weeks to make a good operative local condition. Surgery was performed under general anesthesia and a mass about 4.0×3.0 cm in diameter near inguinal ligament was removed. The cut surface revealed small hemorrhagic areas or spaces. Microscopic examination of the dissected mass confirmed the diagnosis of inguinal endometriosis. It was found that the patient had a moderate inguinal swelling on the first visit to the hospital as an outpatient 7 days after operation, but the swelling disappeared shortly afterword. She has been receiving a post-operative GnRH analog therapy for 3 months to maintain a good local condition. The authors concluded thatthe appearance of a lump in the inguinal region and objective changes of the lesion in relation to the menstrual cycle should be considered as the symptoms of endometriosis.

  We report a case of new-onset depressive disorder in a patient with a history of rectal endometriosis treated with GnRH analog and no previous psychiatric history. This medical history allowed us to suspect the possibility of a link between GnRH analog and depression. It also highlighted the need to screen patients treated with GnRH analog for depression.
  The patient was 41-year-old woman who had been diagnosed with rectal endometriosis. She was referred to the Gynecology Department of Tsuchiura Kyodo General Hospital. The subjective symptoms included cyclic abdominal pains and rectal bleedings. The patient had undergone total abdominal hysterectomy and left salpingo-oophorectomy for endometriosis two years before. She was started by her first gynecologist on GnRH agonist (nafarelin acetate) and the symptoms disappeared soon. But several weeks after the initiation of the GnRH agonist treatment, she began to feel depressed and hopeless. She visited a psychiatric hospital and diagnosed as having depression. She was given anti-depressive drugs and inpatient treatment at the psychiatric hospital. Her clinical course was reviewed by her second gynecologist, and she was suspected to have developed depressive disorder by GnRH analog treatment. She stopped taking GnRH analog medication and started progestin (Dinagest) therapy. She became soon free of depressive disorder and then anti-depressive drugs with rectal endometriosis well controlled. This case also suggested Dinagest is a recommended drug for rectal endometriosis.