A urinary cyst; a circumscribed area of extravasation of urine. ... Origin: uro-+ G. Onkos, mass (tumour) ... (05 Mar 2000) ... 
Type: Term Pronunciation: yū-rong′kŭs Definitions: 1. A urinary cyst; a circumscribed area of extravasation of urine.
uroncus, urinoma A collection of urine encapsulated by fibrous tissue, resulting from leakage of urine from a tear in the ureter, renal pelvis, or renal calices because of obstruction of the ureter; it may be a result of external trauma or a postoperative complication.