PMC4939492_01
Abdominal images. Sonography of the lower abdomen on day 4 (A) shows a multi-septated cystic mass above the bladder. Contrast-enhanced abdominal computed tomography scan (B, transverse; C, coronal; D, sagittal) shows a 6 x 5-cm abscess adjacent to the urinary bladder in the mid-supravesical to umbilical area (arrows).
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We immediately conducted lower abdominal sonography (Fig. 1A), which demonstrated a huge cystic abscess above the bladder. An abdominal computed tomography (CT) scan (Fig. 1B-1D) confirmed a 6 x 5-cm-sized urachal abscess that was attached from the dome of the bladder to the umbilicus along the mid-supravesical line.
(A, B) Cystoscopy shows protruding mucosal masses on the anterior wall of the urinary bladder (arrows).
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Some protruding masses were detected on the anterior wall of the urinary bladder (Fig. 2); however, the bladder was not connected to the abscess.
Histology of the excised urachal abscess. (A) The excised mass was composed of fibro-adipose tissue with inflammatory cells (H&E, x100). (B) The pathological findings show acute and chronic inflammation with proliferating granulation tissue (H&E, x40).
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The biopsy report of the excised urachal abscess (Fig. 3) was consistent with benign features, such as acute and chronic inflammation with proliferation of granulation tissue, lipid granuloma with foamy histiocytes and fibrosis, and surrounding fibroadipose tissue with inflammatory cells.