RADIOLOGY: KIDNEY: Case# 33985: PTLD. Renal transplant patient. 1) Echogenic mass with cystic component in the renal transplant hila causing focal stenosis in the main renal artery. The appearance would be most consistent with post-transplant lymphoproliferative disorder. Alternatively, renal abscess in this area cannot be excluded. Correlation with clinical history recommended. 2) Marked hydronephrosis with internal debris within the collecting system of the transplant kidney. This is felt to likely be due to obstruction from the above mass. 3) Small bilateral pleural effusions and small amount of ascites.