PMC9238218_01
Imaging and pathologic features of renal myxoma in a 62-year-old male.. A. The multiphase pre- and post-contrast enhanced CT images show an iso-attenuated mass (arrows) in the left renal hilum in the pre-contrast image with homogenous gradual enhancement in portal and delayed phases.. B, C. MR images reveal a well-defined 5.0 cm mass (arrows) in the left renal hilum with intermediate high signal intensity on a fat-suppressed T2-weighted image which extends to the renal sinus and periureteral space without parenchymal invasion (open arrow), and shows a slightly high signal intensity on diffusion weighted image, but no significant restriction on ADC, with slightly lower signal intensity in the renal sinus compared with the renal cortex, and an associated hematoma in the left proximal ureter (arrowhead) on the T1-weighted image, mild enhancement on the arterial phase, and gradual homogenous enhancement pattern on the portal and delayed phases.. D. Gross specimen obtained from left nephrectomy shows a well-demarcated, grayish-white, myxoid, soft mass in the renal pelvis, and microscopic specimen of the mass shows uniform bland-looking spindle cells in a diffuse whirling pattern (hematoxylin and eosin stain, x 200).
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F1
A 5.0 cm-sized iso-attenuated mass was noted in the hilum of the left kidney on pre-contrast CT (Fig. 1A). T2-weighted image (T2WI), without diffusion restriction (Fig. 1B). The tumor extended to the renal sinus and the periureteric space. There was a well-defined solid tumor in the renal hilum, with a protruding renal pelvis and proximal ureter found intraoperatively. The tumor was identified histopathologically as myxoma that originated from the renal sinus and did not invade the renal parenchyma (Fig. 1C).