PMC9238200_01
Imaging and pathologic features of multilocular cystic neoplasm of low malignant potential in a 62-year-old female.. A. Axial (left) and coronal (right) contrast-enhanced images show a well-defined slightly high-density mass of approximately 60 Hounsfield unit located in the left renal cortex with partly exophytic growth.. B, C. Axial T2-weighted MR image (B), pre-contrast T1-weighted image (C) display fluid-fluid levels in the mass lesion and dependent high signal intensity on the T1-weighted image (arrow), suggesting hemorrhage. The non-dependent portion of the mass shows intermediate signal intensity (asterisks) on T2-weighted (B) and T1-weighted MR image (C).. D, E. Axial (D) and coronal (E) contrast-enhanced T1-weighted MR images show mild enhancement of the peripheral, minimally thickened wall and septa of the mass (arrow).. F. Histopathology confirms the lesions as multilocular cystic renal neoplasm of low malignant potential, which is lined by a single layer of tumor cells (arrows) with abundant clear or granular cytoplasm with low-grade nuclei (hematoxylin and eosin stain, x 100).
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F1
The mass demonstrated partly exophytic growth and equivocal peripheral enhancing septa (Fig. 1A). Relative to the normal renal cortex, the nondependent portion showed intermediate signal intensity on axial T2-weighted image and T1-weighted image (Fig. 1B, C). On dynamic contrast-enhanced scan, the mass showed a few minimally thickened enhancing septa, about 3 mm in thickness in the peripheral portion (Fig. 1D, E). The final diagnosis was confirmed to be MCRNLMP (Fig. 1F).