Burstein J, Woodside J R
Radiology. 1977 Jun;123(3):599-600. doi: 10.1148/123.3.599.
An asymptomatic hemorrhagic renal cyst was benign at angiography, nephrotomography, cystography, and cytologic examination. Malignancy was found at surgery. Malignancy cannot be excluded in a hemorrhagic cyst which is benign by all other criteria.