Abstract
Teratomas are the most common germ cell tumors derived from embryonic tissue composed of cells from two or more germ cell layers. These tumors arise in gonads and extragonadal sites such as midline, mediastinum, sacrococcygeal region, and retroperitoneum. Retroperitoneum is an unusual site in adults. Malignant transformation in teratomas is rarely seen only in 1% cases. We present the case of a 57-year-old female patient who presented with abdominal pain and swelling and was diagnosed as adenocarcinoma in a retroperitoneal teratoma. Adenocarcinoma is a rare somatic malignancy arising in a retroperitoneal teratoma. Extensive literature search revealed
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