Polyorchidism: Evaluation by MR

Polyorchidism (testicular duplication) is a rare congenital anomaly of the genitourinary tract. Ahlfeld is credited with the first histologically confirmed description in 1880, and Lane reported the first case found at surgery in 1895. Subsequent reports of supernumerary testicles have involved cases of triorchidism, with the exception of one patient with bilateral duplication. With the advent of high-resolution sonography, accurate assessment of polyorchidism before surgery is possible in certain cases. We report a case in which MR imaging was successfully used to detect bilateral polyorchidism.