Fig. 5
From: Multimodality imaging of renal lymphoma and its mimics
Direct extension from retroperitoneal adenopathy of renal lymphoma. Grayscale ultrasound image (a) demonstrates mild hydronephrosis (arrowhead) of the left kidney. Spectral Doppler ultrasound (b) demonstrates a hypoechoic mass (white arrow) arising from the lateral left kidney with arterial waveform. Axial contrast CT (c) confirms the left renal mass (white arrow) with additional extensive retroperitoneal and peritoneal infiltrative disease encasing the left renal hilum. Note the maintained flow and normal caliber left renal artery (black arrow) despite tumor burden, characteristic of lymphoma. This patient is known to have follicular lymphoma with high grade B-cell lymphoma transformation