Transverse US of the prostatic urethra (upper left) shows a small round echogenic lesion with posterior shadowing in the center of the prostatic urethra which was not seen in the transverse US of the penile urethra (upper right). Sagittal US of the bladder (lower left) shows an echogenic lesion with posterior shadowing in the posterior aspect of the bladder that on transverse US of the bladder (lower right) resolved into two separate echogenic lesions with posterior shadowing.
The diagnosis was urethral trauma due to a metal axle from a toy car the patient had inserted into his urethra years before which had perforated the bladder creating a colovesical fistula and caused development of two bladder stones.
Pediatric Imaging 