PMC6203239_01
Oblique reconstruction late portal phase CT scan showing the tumor (asterisk) totally filling the right ureter.
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PMC6203239_01_gr1.jpg
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The patient was referred to the urology outpatient clinic at our academic medical center with a uroCT (Computerized tomography) showing an obstructive worrisome lesion mimicking an upper tract urothelial carcinoma (UTUC) of the right pelvic ureter (Fig. 1).
The urothelial tissue is represented as a thin layer on top. The lesion consists of multiple vessels and some connective tissue (hematoxylin phloxine saffron stain x 5).
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PMC6203239_01_gr2.jpg
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The tumor (Fig. 2) is heterogeneously positive with the alcian blue stain (Fig. 3a).
a. Alcian blue staining found in the interstitium. A typical feature of the collagenous structure of angiomyxomas (Alcian blue staining x 20). b. CD34 immunohistochemical staining highlighting the rich vascularization of the lesion (CD34 x 5).
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PMC6203239_01_gr3.jpg
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CD34 (Cluster of Differentiation) shows good vascularization (Fig. 3b) as well as factor 8.