PMC5322504_01
a-e. Sinus orifice (arrow) over the prepubic area (a). MRI revealed a prepubic sinus track (arrow) (b). No communication was observed between the fistula and urinary tract using retrograde cystography (c). Perioperative photo showing a sinus tract extending toward the bladder (d). Histopathologic examination showed that the sinus was lined by only a stratified squamous epithelium and surrounded by bundles of smooth muscles (H&E staining, x40) (e).
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A 20-month-old boy was admitted to our hospital with a 3-month history of recurrent mucopurulent discharge from a pinpoint opening located over the prepubic area (Figure 1a). Avanto 1.5T; Siemens, Erlangen, Germany) showed a sinus tract with no communication with the urinary system (Figure 1b). A retrograde urethrogram also showed no communication between the fistula and the urinary tract (Figure 1c). During the operation that ensued, a 3 cm-long tract running closely to the pubic symphysis and extending toward the bladder was totally resected (Figure 1d). Histopathologic examination showed that the sinus was lined by only a stratified squamous epithelium and surrounded by bundles of smooth muscles (Figure 1e).