case_images: PMC5990874_01
case_images: Coronal view contrast-enhanced computed tomography (CT) of the pelvis demonstrating a heterogeneous cystic lesion involving the right anterolateral bladder wall. There is no associated lymphadenopathy or evidence of metastatic disease.
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case_images: Contrast-enhanced computed tomogram (CT) of the urinary tract showed a filling defect in the anterior wall of the bladder with normal upper urinary tracts and kidneys (Figure 1).
case_images: Axial view magnetic resonance imaging (MRI) T2 sequence showing an irregular cystic lesion, with a possible soft tissue component, at the right bladder dome measuring 4 x2.5 x 2 cm with irregular mucosa and a small tract between the lesion and the bladder.
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case_images: Subsequent magnetic resonance imaging (MRI) confirmed the presence of a predominantly hyperintense, on the T2 imaging, and hypointense, on T1 imaging, extrinsic bladder abnormality with an intermediate to low signal irregular margin (Figure 2).
case_images: Cystoscopic examination demonstrating a cystic lesion in the bladder dome with normal overlying urothelium and a foramen discharging mucus.
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case_images: Flexible cystoscopy showed a cystic lesion at the bladder dome with mucus discharging from a tiny round opening on the surface of this lesion (Figure 3).
case_images: Histological examination. The sections show a cavity lined by dysplastic columnar epithelium forming numerous villi. The features are those of a villous adenoma with low-grade dysplasia. Dysplastic epithelium is apposed to muscularis propria but invasion is not identified. The margin of resection is free from dysplasia, the transitional epithelium showing no significant abnormality.
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case_images: Microscopic examination revealed a cavity lined with dysplastic columnar epithelium forming numerous villi (Figure 4).