Extraordinary large primary retroperitoneal cystic teratoma: An extremely rare neoplasm

Teratomas are the germ cell tumors which comprises of tissues from all the three germ cell layers. Primary retroperitoneal teratoma is a relatively rare tumor in adults. The primary retroperitoneal teratoma constitutes 6–11% of the retroperitoneal tumors. Sixty percent of the retroperitoneal teratomas occur in children less than 15 years.It occurs more commonly in females than males. The order of frequency for teratoma is ovary, testis, mediastinum and the retroperitoneum at last. Early diagnosis and surgery are the mainstay of treatment. We report a rare case of large primary retroperitoneal teratoma. This is the largest primary retroperitoneal teratoma reported in the literature to our knowledge.