Which bladder anomaly is anechoic and connects the bladder to the umbilicus with no internal blood flow?

Which bladder anomaly is anechoic and connects the bladder to the umbilicus with no internal blood flow?

• A. Urachal fistula
• B. Urachal cyst
• C. Urachal sinus
• D. Pelvic diverticulum

Answer: (B)

Urachal remnants come from the fetal connection between the bladder and the umbilicus. When this tract persists as a cystic remnant, it sits in the midline between the bladder and the umbilicus and does not communicate with either end. On ultrasound it appears as a simple, well-defined anechoic (fluid-filled) structure with posterior acoustic enhancement and no internal blood flow on Doppler. That combination—fluid-filled, purely cystic appearance, lack of vascularity, and location along the urachus between the bladder and umbilicus—fits a urachal cyst. The other options describe different urachal abnormalities or bladder findings: a fistula would create a continuous tract between bladder and umbilicus and may permit urine passage; a sinus opens at the umbilicus and may drain there but is a tract rather than a standalone midline cyst; a pelvic diverticulum is an outpouching of the bladder wall itself, not a midline urachal remnant.

Urachal remnants come from the fetal connection between the bladder and the umbilicus. When this tract persists as a cystic remnant, it sits in the midline between the bladder and the umbilicus and does not communicate with either end. On ultrasound it appears as a simple, well-defined anechoic (fluid-filled) structure with posterior acoustic enhancement and no internal blood flow on Doppler. That combination—fluid-filled, purely cystic appearance, lack of vascularity, and location along the urachus between the bladder and umbilicus—fits a urachal cyst.

The other options describe different urachal abnormalities or bladder findings: a fistula would create a continuous tract between bladder and umbilicus and may permit urine passage; a sinus opens at the umbilicus and may drain there but is a tract rather than a standalone midline cyst; a pelvic diverticulum is an outpouching of the bladder wall itself, not a midline urachal remnant.