A case of an endometriosis associated ovarian carcinoma that could not be diagnosed by preoperative MRI

We report a case of endometriosis associated ovarian carcinoma that could not be diagnosed using preoperative magnetic resonance imaging (MRI). A 29-year-old woman presented with 3-year history acute abdominal pain. MRI revealed left-sided endometrial cyst measuring 4.5 cm, and she had low-dose estrogen-progestin (LEP) therapy for left cyst. The showed slight increase in size to 5 1 year after it was diagnosed; therefore, underwent pelvic MRI, which did reveal evidence malignancy but only intracystic nodules, were suspected clots. She continued receive LEP therapy; however, transvaginal ultrasonography performed 2 years 6 months the detection an 7 at time clots without any malignancy. Contrast-enhanced 10 initial diagnosis further growth both nodules; surgery. nodule enlarged; we observed no contrast effect, position appeared have shifted from ventral dorsal aspect. Therefore, speculated most likely benign lesion, laparoscopic cystectomy. observe tumor markers during course study. Intraoperatively, ruptured; visualize clear boundary between surrounding parenchyma, lesion easily removed. detected abnormalities contralateral ovary or pelvis. Histopathological evaluation resected specimen cell carcinoma, performed, adnexectomy omental biopsy, month operation. Clear ovary, administered 3 cycles combination carboplatin plus paclitaxel. has shown recurrence over 4 postoperatively.