Primary renal teratomas are extremely rare germ cell tumors and can be difficult to distinguish from other fat-containing renal masses in infants using imaging alone. We report a case of a 3-month-old male with a right renal mass detected prenatally. Postnatal contrast-enhanced computed tomography revealed a well-circumscribed fat-containing lesion at the upper pole of the kidney. The patient underwent open nephron-sparing surgery with complete tumor enucleation. Histopathology confirmed a mature teratoma with negative margins. The postoperative course was uneventful, and at 1-year follow-up the child showed normal renal development with no evidence of recurrence. • Primary renal teratoma is an extremely rare renal tumor in infants. • Prenatal diagnosis of the tumor is possible, and it may guide postnatal treatment. • Computed tomographic findings can consist of macroscopic fat. • Nephron-sparing surgery is feasible for localized mature teratomas.
Mai et al. (Wed,) studied this question.
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