*4-year-old girl.
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What is the most likely diagnosis?
Answer
Answer: Urachal cyst
Case Discussion:
US images show an anechoic, thin walled cystic mass (arrows) at the anterosuperior bladder. No blood flow was identified on color Doppler imaging.
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Congenital urachal remnant abnormalities denote a series of potential anomalies.
There are four types of urachal anomalies:
• Patent urachus (~50%)
• Urachal cyst (~30%)
• Urachal sinus (~15%)
• Urachal diverticulum (~5%)
The differential diagnosis includes bladder diverticulum, vitelline cyst, mesenteric cyst, Meckel diverticulum, umbilical hernia, and ovarian cyst.
References:
1. Berrocal T, López-pereira P, Arjonilla A et-al. Anomalies of the distal ureter, bladder, and urethra in children: embryologic, radiologic, and pathologic features. Radiographics. 22 (5): 1139-64.