Primary renal carcinoid tumor: A rare cystic renal neoplasm

Figure 1 Axial images of the dynamic abdominal computer tomography scans show a well-circumscribed, bilobed renal mass in the left kidney that is composed of a solid part and a cystic part containing peripheral wall and septal calcifications. A, B: Pre-contrast images; C, D: Corticomedullary phase images; E, F: Nephrographic phase images. The lesion has significant enhancement in the right half of the solid portion during the corticomedullary phase and enhancement washout during the nephrographic phase (black arrow). A non-enhancing cystic portion is evident in the left half (white arrow).