CT Abdomen and pelvis
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There is a very large retroperitoneal tumour that contains fat, and other germ cell layers that constitute a teratomatous lesion.
No metastases are seen.
Testes ultrasound is recommended.
This case was pathologically proven as a teratoma.
This kind of tumour shows mixed dermal elements derived from the three germ cell layers.
Extragonadal teratomas tend to occur in midline structures in the anterior mediastinum, retroperitoneum, sacrococcygeal region, and pineal gland.
Retroperitoneal teratomas have two incidence peaks: first six months of life and in early adulthood.
There is a 25% chance of malignancy.