Primary extragonadal yolk sac tumor originating from adrenal gland.

Extragonadal germ cell tumors are germ cell tumors with no evidence of a primary tumor within the gonads, most often located in the mediastinum or retroperitoneum. We present an extragonadal yolk sac tumor that presented as an adrenal carcinoma and required left adrenalectomy, nephrectomy, and significant IVC thrombectomy. This case, to our knowledge, is the first documented case of extragonadal yolk sac tumor originating from the adrenal gland.