What structure does this cyst appear to arise from?
Urethra (located anterior to the cyst).
Which gender is most frequently affected?
Far more frequent in women (uncommon in men).
MRI of the pelvis demonstrates on the posterior side of the urethra a fluid-filled thin-walled structure. It appears to communicate the lumen of the urethra (best seen on the axial T2 images). The base of the bladder and the adjacent urethra are displaced.