Primary renal carcinoid tumor: A rare cystic renal neoplasm

Figure 2 Coronal images of dynamic computer tomography scans show a well-circumscribed, bilobed renal mass in the left renal upper pole with a relatively preserved reniform shape and no definite perirenal fat infiltration or renal sinus invasion or herniation. The early enhancing solid right half (thick arrow, A) and the non-enhancing cystic left half (thin arrow, A) are apparent. The delayed washout pattern of the enhancing solid portion is evident in the nephrographic phase (thick arrow, B).