Abnormal renal morphology Renal lymphangiectasia Hygroma renale Peripelvic lymphangiectasia A developmental anomaly of renal lymphatics that results from a failure of the lymphatics to make communication with the rest of the lymph trunks. The abnormal lymphatics thus dilate and form cystic spaces at the renal sinus and in the perinephric space. Renal lymphangiomatosis