<p>Robert’s uterus is a very rare type of Mullerian duct anomaly. It is classified as a variant of the septate uterus under Class V of the American Society of Reproductive Medicine (ASRM) Classification, where a septum divides the uterine cavity asymmetrically resulting in the formation of a noncommunicating cavity. It is an exceptionally rare type of complete septate uterus. Patients may present with recurrent pain, severe dysmenorrhea, recurrent abortions, and infertility (Varun et al. in J Obstet Gynaecol India, 2024). A 38 years parous female with complaint of severe excruciating lower abdominal pain with mild fever was admitted to our hospital. Dysmenorrhea persisted and increased in intensity gradually. She had a history of a salpingo-oophorectomy. She has been on regular analgesic therapy—both oral and parenteral—since menarche, with a notable increase in frequency and dosage over the past few years due to escalating symptom severity. USG showed a septate uterus with hemorrhagic collection in the left endometrial cavity. The specimen showed a thick complete uterine septum with the right cavity lacking communication to the cervix, indicative of Robert’s uterus. Additionally, she had left ovarian abscess. Here, we report same case that was initially diagnosed as simple hematometra with left tubo-ovarian mass (TO Mass).</p>