Ultrasound screening of the abdominal cavity organs was performed in 98 patients, and renal cysts were revealed in 31 patientsare. 11 (26,6%) of 31 patients had renal cysts with complex structure. In 4 patients, complex cysts were located in parapelvic zone, in 7 patients - in different parts of the renal parenchyma. Pharmaco-Doppler sonography and computed tomography with bolus contrast enhancement in 7 patients with complex parenchymal cysts had revealed indirect signs of a malignant process - septums, thickening of the walls of cysts and septums, foci of calcination, increased blood circulation in the thickened renal cyst walls, venous stasis on the periphery of cysts and renal medulla, increasing the density of the thickened walls. Results of morphological studies have confirmed the presence of a malignant process in 5 of these 7 patients. In 4 patients with parapelvic cysts malignant process in ectomized layers was not revealed.
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