[Secondary erythrocytosis in 3 cases of neoplastic disease].

Three cases of tumor-associated (so called "paraneoplastic") erythrocytosis are described. In a 24 year old man with adrenal gland cancer hematological parameters normalized shortly after surgery, but he died 8 weeks later because of the dissemination of the disease. In a 48 year old man with hypernephroma of the left kidney and in a 49 year old woman with the left cerebral hemisphere meningioma Hb level, hematocrit and red blood cell count normalized after tumor removal and remained within normal range 39 and 7 months respectively. It is suggested that a probability of the neoplastic disease as a cause of erythrocytosis should be taken into account.