One of the complications of a urethral diverticulum is stone formation within the diverticulum.

These would appear as filling defects within the diverticulum on a VCUG or a double-balloon retrograde urethrogram, but it may be impossible to detect them if they are not calcified and if the diverticulum does not fill.

MRI is a more reliable way to assess urethral diverticulum stones. The urethral diverticulum is more reliably imaged, regardless of its size, and the stones are hypointense on both T1 and T2 weighted sequences.