Wilms' tumor is a rare malignancy of kidney in adults. It usually cannot be
differentiated from other renal masses preoperatively. This is a presentat
ion of a case of adult Wilms' tumor who developed spontaneous hemorrhage du
ring radiological evaluation, As tumor rupture can change the stage of the
tumor and alter the prognosis of the patient, urgent work-up and treatment
is advised. (C) Elsevier Science inc., 1999.