Errors in urachal obliteration may result in 4 clinical anomalies: patent urachus, urachal cyst, urachal sinus, or vesicourachal diverticulum. Despite the fact that urachal cysts are one of the more common of these anomalies, most go undetected, presenting in the setting of infection. There are reports in the literature of cysts misdiagnosed as other inflammatory processes; however, the converse is reported with less frequency. We present the case of a 3-year-old girl who was admitted to our institution with a suspected urachal cyst. This was subsequently diagnosed as a granulomatous mass caused by the gram negative bacterium Bartonella.
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