These ovarian tumours were identified by histopathological analysis as immature cystic teratomas. The clinicopathological characteristics of all ovarian teratomas identified in two centres during the evaluation period were also briefly summarised in this case report. Younger individuals are more likely to develop an immature ovarian teratoma, so doctors must always be extremely cautious when considering the possibility of a germ cell tumour.

Retroperitoneal teratomas were referred to as “unattached retroperitoneal tumours” in an incredibly early study among other types of tumours. Our study’s objective was to provide detailed information on this type of growth’s surgical anatomy and expansion trend. Additionally, the anatomical connection to the duct gland was noted. Malignant components as well as mature and immature tissue components should be present. Only 3%–5% of teratomas have a retroperitoneal tumour, which is highly uncommon. Despite the availability of cutting-edge imaging methods, the specialist doctor should keep in mind the typical anatomy of this type of tumour. Teratoma is an embryonic tumour that develops from totipotent cells that comprise tissue from at least two or more often three germ layers.