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Metanephric adenoma (MA) is a rare, benign tumour of the kidney, that can have a microscopic appearance similar to a nephroblastoma (Wilms tumours), [1] or a papillary renal cell carcinoma. It should not be confused with the pathologically unrelated, yet similar sounding, mesonephric adenoma .
The metanephrogenic blastema or metanephric blastema (or metanephric mesenchyme, or metanephric mesoderm) is one of the two embryological structures that give rise to the kidney, the other being the ureteric bud. The metanephric blastema mostly develops into nephrons, but can also form parts of the collecting duct system.
Ectopic ureter (or ureteral ectopia) is a medical condition where the ureter, rather than terminating at the urinary bladder, terminates at a different site. [1] [2] In males this site is usually the urethra, in females this is usually the urethra or vagina. [3]
Gross appearance of a renal oncocytoma (left of image) and a slice of a normal kidney (right of image). Note the rounded contour, the mahogany colour and the central scar. In gross appearance, the tumors are tan or mahogany brown, well circumscribed and contain a central scar.
The RENAL Nephrometry Scoring System is used to measure the complexity of kidney tumors for determining whether a renal mass is appropriate for partial or radical nephrectomy, and is estimated by CT scan as follows: [7] The nephrometery score takes into account the size of the tumor (Radius), how much of the tumor is inside or outside of the ...
The collecting ducts descend again into the medulla and fuse to wider collecting ducts, which pass through the inner medulla. [ 68 ] [ 69 ] Based on the location of the renal corpuscle in the cortex, nephrons are classified into 3 types: superficial (closer to the renal capsule), midcortical (in the middle part of the cortex) and juxtamedullary ...
Histopathologic types of kidney tumor, with relative incidences and prognoses. Cystic nephroma is seen at bottom right in pie chart. cystic partially differentiated nephroblastoma; cystic standard nephroblastoma (cystic Wilm's tumor) cystic mesoblastic nephroma; cystic renal cell carcinoma; other renal cysts
The mechanism of multicystic dysplastic kidney is a result of an abnormal induction of metanephric mesenchyme. This could be a result of a formation difficulty of the mesonephric duct . Some mutations in genes associated with renal dysplasia (in syndromes) have been determined.