PMC8024106_01
Contrast-enhanced computed tomography in arterial (a) and venous (b) phases, revealing a slightly enhancing mass occupying the lower pole of the left kidney.
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A 57-year-old asymptomatic female patient was referred for a 33 x 27 mm solid lesion arising from the lower pole of the left kidney, which was diagnosed by computed tomography (CT) performed in the context of annual surveillance (Figure 1).
18F-Fluorodeoxyglucose positron emission tomography-computed tomography fusion scan images show a well-defined, heterogeneously low-grade fluorodeoxyglucose avid solid hypodense lesion at the lower pole of the left kidney.
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On 18F-fluorodeoxyglucose positron emission tomography-CT scan (Figure 2), a lump-shaped radioactive concentration shadow was observed at the lower pole of the left kidney, with a maximum standardized uptake value of 7.
Metastatic adenoid cystic carcinoma to the kidney, showing the characteristic cribriform histological pattern of growth. Normal renal parenchyma is seen at the upper half of the image (haematoxylin-eosin stain, original magnification 40x).
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The stroma manifested myxoid and hyalinized features surrounded by tumor cells forming cylindrical structures (Figure 3).