PMC6732730_01
CT revealing an exophytic lesion in the lower pole of the left kidney, measuring 36 x 23 x 39 mm, well demarked, with peripheral enhancement, and a central fluid collection.
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Subsequent computed tomography (CT) revealed an exophytic lesion in the lower pole of the left kidney, measuring 36 x 23 x 39 mm, well demarked, with peripheral enhancement, and a central fluid collection (Fig. 1).
MRI-T2 weighted image demonstrating a hyper intense peripheral signal associated to an exocentric, heterogenous and irregular hypointense signal in the center of the tumor.
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T1 weighted image and hyper intense with restricted diffusion in T2 weighted image. T2 weighted image also demonstrated a hyper intense peripheral signal associated to an exocentric, heterogenous and irregular hypointense signal in the center of the tumor (Fig. 2).
HEx40 : Proliferation composed of long spindle cell with acidophilic cytoplasm and vesicular nuclei, showing a patternless architecture with irregularly branching hemangiopericytoma-like vessels.
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It also showed a thin-walled, hemangiopericytoma-like vessels (Fig. 3).
Immunohistochemical staining positive for CD34.
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Bcl-2 and HMB45 stain was negative (Fig. 4). Based on the histological and immunohistochemical features, the diagnosis of SFT of the kidney was established.