PMC5990874_01
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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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).
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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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).
Cystoscopic examination demonstrating a cystic lesion in the bladder dome with normal overlying urothelium and a foramen discharging mucus.
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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).
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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Microscopic examination revealed a cavity lined with dysplastic columnar epithelium forming numerous villi (Figure 4).