• Fatima Tuz Zahra Shakir, Rizwan Sultan, Riaz Siddiqui, M Zubair Shah, and Ayesha Javed.
• Department of Surgery, Islamabad Medical Complex (IMC), Nescom, Islamabad, Pakistan.
• J Coll Physicians Surg Pak. 2021 Nov 1; 31 (11): 1351-1353.

AbstractTeratomas belong to non-seminomatous germ cell tumors and originate from totipotent germ cells. They are mostly made up of tissues derived from all three layers, i.e., endoderm, mesoderm and ectoderm. They can be mature teratomas, which are benign or immature teratomas, having malignant potential. Extra-gonadal mature cystic teratomas are uncommon, particularly in retroperitoneum. Other sites are sacrococcygeal, mediastinal, and pineal regions. They are mostly detected in females in reproductive age group. In this case report, we discuss a female patient being worked up for persistent vomiting and food indigestion, initially managed on the line of acid peptic disease. She was found to have a large retroperitoneal mass in adrenal region producing mass effect on intestines. Later on, it was discovered to be mature cystic teratoma on histopathological evaluation. Key Words: Mature teratoma, Adrenal gland, Retroperitoneum.

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