Primary retroperitoneal teratoma is a tumor originating from each of the three germ cell layers and generally presenting as a large mass in the gonadal and sacrococcygeal region. It is very rarely seen in adults with scarcely any cases reported in literature (Gatcombe et al. J Surg Oncol 86(2):107–113, 2004). Here, we describe an unusual case of a 48-year-old female, presenting with a large retroperitoneal mass —diagnosed on radiological work-up and was later confirmed as a retroperitoneal teratoma by histological examination. Exploratory laparotomy with tumor excision was performed. The patient’s recovery was uneventful and is doing well on follow-up.
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