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Bosniak was a pioneer in renal mass imaging, best known for developing a renal cyst classification system named in his honor. [5] [6] [7] The Bosniak classification system for renal cysts has been widely adopted by radiologists and urologists as the gold standard for guiding the management of cystic renal lesions, sparing many patients from unnecessary surgery for benign lesions.
Simple renal cyst. A renal cyst is a fluid collection in or on the kidney. There are several types based on the Bosniak classification. The majority are benign, simple cysts that can be monitored and not intervened upon. However, some are cancerous or are suspicious for cancer and are commonly removed in a surgical procedure called nephrectomy.
Crossed fused renal ectopia: One kidney crosses over to the opposite side and fuses with the other kidney. The abnormal orientation may obscure the renal sinus, leading to the faceless kidney sign. Multicystic dysplastic kidney (MCDK): A nonfunctional kidney with multiple cysts and absence of normal renal parenchyma. The lack of normal renal ...
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The kidney is divided into parenchyma and renal sinus. The renal sinus is hyperechoic and is composed of calyces, the renal pelvis, fat and the major intrarenal vessels. In the normal kidney, the urinary collecting system in the renal sinus is not visible, but it creates a heteroechoic appearance with the interposed fat and vessels.
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Multicystic dysplastic kidney (MCDK) is a condition that results from the malformation of the kidney during fetal development. The kidney consists of irregular cysts of varying sizes. Multicystic dysplastic kidney is a common type of renal cystic disease, and it is a cause of an abdominal mass in infants. [5]
The enlargement of the kidney can be related to the degree of cyst formation. The cysts which come from the Bowmans space can also cause the kidneys to appear asymmetrical or misshapen. Cysts can cause injury by destroying nearby renal tissue [10] Familial GCKD can have enlarged or normal size kidneys. [6]