Six cases of benign hemorrhagic renal cyst are presented. Although these masses resembled cysts on nephrotomography and arteriography, exclusion of malignant disease was difficult on cyst puncture and gross surgical inspection. The aspirated fluid contained degenerating hemorrhagic material in all cases, malignant cells in none, and fat in one. Contrast medium injected into the cyst showed the cavity to be irregular in three and smooth in three. A presumptive diagnosis is possible by a combination of tests. Diagnosis was confirmed by surgery in two patients and by autopsy in one. Nephrectomy can be avoided.
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Jackman et al. (1974) studied this question.
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