PMC4736062_01
44-year-old woman with 4-month history of lumbar pain diagnosed with perivascular epithelioid cell tumor. (a) Sagittal sonographic image of the left hypochondrium depicts the presence of a large heterogenous left perirenal mass. The lesion has cystic parts (asterisk) and solid, heterogeneous components (long arrow). The mass is in close proximity to the ipsilateral kidney (arrowhead). (b) Sagittal power Doppler image of the left perirenal mass reveals vascularity of the solid parts (arrowheads).
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F1
Sonography revealed the presence of a large, heterogenous, well-margined mass, located in the left perirenal space [Figure 1a]. The lesion was partly cystic solid, with solid components detected with moderate vascularity at Doppler examination [Figure 1b].
44-year-old woman with 4-month history of lumbar pain diagnosed with perivascular epithelioid cell tumor. (a) Transverse noncontrast computed tomography image demonstrates inhomogeneous solid parts of the lesion (arrow). The mean computed tomography density of the solid components is 35 HU on unenhanced images, similar to that of normal renal parenchyma. Coronal reformations during (b) the portal phase and (c) the excretory phase depict sharply demarcated left perinephric mass (arrow), partly cystic and solid, in close proximity to the renal capsule. The solid parts of the tumor enhance intensely and heterogeneously, with a mean portal phase attenuation of 100 HU. The left renal parenchyma is intact. Prominent vessels are seen in the left perirenal space adjacent to the lesion (long arrow).
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F2
The presence of a large, inhomogeneous left perirenal mass [Figure 2a], in close proximity to the renal capsule was confirmed. The tumor had cystic parts, with CT density similar to that of water, not enhancing after intravenous contrast medium administration, and solid parts, with strong, heterogeneous enhancement [Figure 2b]. Peritumoral vascularity, seen as asymmetrically increased vessels adjacent to the mass within Gerota fascia, was also identified [Figure 2c].