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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 .
Nephrogenic adenoma is a benign growth typically found in the urinary bladder. It is thought to result from displacement and implantation of renal tubular cells, as this entity in kidney transplant recipients has been shown to be kidney donor derived. [1] This entity should not be confused with the similar-sounding metanephric adenoma.
High magnification micrograph of a cystic nephroma showing the characteristic simple epithelium with hobnail morphology, and the ovarian-like stroma. H&E stain.. The characteristics of cystic nephromas are:
Rhabdoid tumors have a distinctive histology and abnormalities (i.e. loss of heterozygosity, single nucleotide polymorphism, and deletions) in chromosome 22. [11] Clear cell sarcoma of the kidney, which is responsible for 5-10% of childhood pediatric tumors, occurs predominantly in children from 2 to 3 years of age. Unlike mesoblastic nephroma ...
In mice, the kidneys are approximately 1 cm (0.4 in) long, weighing 400 mg, with 16,000 nephrons, while in the killer whale, the kidney length exceeds 25 cm (10 in), the mass is approximately 4.5 kg (10 lb), with the number of nephrons of the order of 10,000,000. At the same time, the killer whale kidneys are reniculate, with each renicule ...
Diagram shows the sequential development and degeneration of the pronephros and mesonephros, and the induction of the ureteric bud and metanephric mesenchyme during kidney development in mammals. The development of the kidney proceeds through a series of successive phases, each marked by the development of a more advanced kidney: the ...
Metanephric dysplastic hematoma of the sacral region (MDHSR) has been described by Cozzutto and Lazzaroni-Fossati in 1980, [1] by Posalaki et al. in 1981 [2] and by Cozzutto et al. in 1982. [3] Three additional cases were seen by Finegold.
An salivary gland oncocytoma (also known as an oxyphilic adenoma) is a well-circumscribed, benign neoplastic growth comprising about one percent of all salivary gland tumors. The histopathology is marked by sheets of large, swollen polyhedral epithelial oncocytes, which are granular acidophilic parotid cells with centrally located nuclei.