Metanephric adenoma pathophysiology
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Shanshan Cen, M.D. [2]
Overview
Pathology
Histopathology
Metanephric adenoma is diagnosed histologically. The tumours can be located at upper pole, lower pole and mid-hilar region of the kidney; they are well circumscribed but unencapsulated, tan pink, with possible cystic and hemorrhagic foci. They show a uniform architecture of closely packed acinar or tubular structures of mature and bland appearance with scanty interposed stroma.[1][2][3][4][5] Cells are small with dark staining nuclei and inconspicuous nucleoli. Blastema is absent whereas calcospherites may be present. Glomeruloid figures are a striking finding, reminiscent of early fetal metenephric tissue. The lumen of the acini may contain otherwise epithelial infoldings or fibrillary material but it is quite often empty. Mitoses are conspicuously absent.[1][2][3][4][5] In the series reported by Jones et al. tumour cells were reactive for Leu7 in 3 cases of 5, to vimentine in 4 of 6, to cytocheratin in 2 of 6, to epithelial membrane antigen in 1 of 6 cases and muscle specific antigen in 1 of 6.[6] Olgac et al. found that intense and diffuse immunoreactivity for alpha-methylacyl-CoA racemase (AMACR) is useful in differentiating renal cell carcinoma from MA but a panel including AMACR, CK7 and CD57 is better in this differential diagnosis.[7] Differential diagnosis may be quite difficult indeed as exemplified by the three malignancies initially diagnosed as MA that later metastasized, in the report by Pins et al.[8]
Cytogenetic characteristics
Brunelli et al. stated that genetic analysis of chromosome 7, 17, and Y may facilitate discrimination of MA from papillary renal cell carcinoma in difficult cases. Their study showed that MA lacks the frequent gain of chromosomes 7 and 17 and losses of the Y chromosome that are typical of papillary renal cell neoplasms, suggesting that MA is not related to renal cell carcinoma and papillary adenoma.[9]
Gross Pathology
Characteristic findings of metanephric adenoma on gross pathology include:
Microscopic Pathology
The characteristics of metanephric adenomas include:
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metanephric adenoma[10]
![metanephric adenoma[10]](/index.php?title=Special:Upload&wpDestFile=Metanephric_adenoma_high_mag.jpg){kind=link}
Genetics
References
- ↑ 1.0 1.1 Kovacs, G.; Akhtar, M.; Beckwith, BJ.; Bugert, P.; Cooper, CS.; Delahunt, B.; Eble, JN.; Fleming, S.; et al. (Oct 1997). "The Heidelberg classification of renal cell tumours". J Pathol. 183 (2): 131–3. doi:10.1002/(SICI)1096-9896(199710)183:2<131::AID-PATH931>3.0.CO;2-G. PMID 9390023.
- ↑ 2.0 2.1 Brisigotti, M.; Cozzutto, C.; Fabbretti, G.; Sergi, C.; Callea, F. (Oct 1992). "Metanephric adenoma". Histol Histopathol. 7 (4): 689–92. PMID 1333853.
- ↑ 3.0 3.1 Jones, E. C.; Pins, M.; Dickersin, G. R.; Young, R. H. (1995). "Metanephric adenoma of the kidney. A clinicopathological, immunohistochemical, flow cytometric, cytogenetic, and electron microscopic study of seven cases". The American journal of surgical pathology. 19 (6): 615–626. doi:10.1097/00000478-199506000-00001. PMID 7755148.
- ↑ 4.0 4.1 Bostwick DG, Eble JN (2008) Urologic Surgical Pathology. St Louis, Mosby, p118.
- ↑ 5.0 5.1 Grignon, D. J.; Eble, J. N. (1998). "Papillary and metanephric adenomas of the kidney". Seminars in diagnostic pathology. 15 (1): 41–53. PMID 9503505.
- ↑ Jones EC, Pins M, Dickersin GR, Young RH (1995) Metanephric adenoma of the kidney. A clinicopathological, immunohistochemical, flow cytometry, cytogenetic and electron microscopic study of seven cases. Am J Surg Pathol 19(6):615-626.
- ↑ Olgac S, Hutchinson B, Tickoo SK, Reuter VE (2006) Alpha-methylacyl-CoA racemase as a marker in the differential diagnosis of metanephric adenoma. Mod Pathol 19:218-224.
- ↑ Pins MR, Jones EC, Martul EV, Kamat BR, Umlas J, Renshaw AA (1999) Metanephric adenoma-like tumours of the kidney. Report of three malignancies with emphasis on discriminating features. Arch Pathol Lab Med. 123:415-420.
- ↑ Brunelli M, Eble JN, Zhang S, Martignoni G, Cheng L (2003) Metanephric adenoma lacks the gains of chromosomes 7 and 17 and loss of Y that are typical of papillary renal cell carcinoma and papillary adenoma. Mod Pathol 16(10):1060-1063.
- ↑ metanephric adenoma. Wikipedia 2015. https://en.wikipedia.org/wiki/Cystic_nephroma#/media/File:Cystic_nephroma_high_mag.jpg Accessed on October, 30 2015
