Fig. 4
From: CT and MRI findings of cystic renal cell carcinoma: comparison with cystic collecting duct carcinoma
a-e. CCDC of left kidney. a Unenhanced CT scan showed a heterogeneous mass together with hemorrhage and calcification (arrow). b, c Mild, heterogeneous enhancement was noted on the cortex and medulla phases (arrow). Tumors had an unclear boundary and showed an infiltrative appearance (arrow). d Tumors had retroperitoneal lymph node metastasis (arrow). e The tumor cells showed tubulopapillary, pseudopapillary, and cribriform patterns (H&E stain; original magnification, ×400)