RT Journal Article SR Electronic T1 Malignant transformation of persistent endometriosis after hysterectomy JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 1390 OP 1392 VO 35 IS 11 A1 Bawazeer, Naif A. A1 Al-Jifree, Hatim M. A1 Gari, Abdulrahim M. YR 2014 UL http://smj.org.sa/content/35/11/1390.abstract AB The malignant transformation of persistent endometriotic implants into endometrioid adenocarcinoma is rare, especially after remote hysterectomy and salpingo-oophorectomy (TAH-BSO), and there are few cases reported in the English language literature. Patients receiving estrogen replacement therapy are common among the reported cases. We present a case that demonstrates the possibility of malignant transformation in a 53-year-old female, known case of endometriosis, who underwent total abdominal hysterectomy and bilateral salpingo-oophorectomy with no evidence of malignancy in the final pathology report. After 9 years, she presented with lower abdominal mass, and histopathological studies confirmed the diagnosis of well-differentiated endometrioid adenocarcinoma. The possibility of malignant transformation and possible risk factors are discussed with a brief literature review.