98
edits
Difference between revisions of "Wilms tumour"
Jump to navigation
Jump to search
→General
(→Gross) |
|||
| (7 intermediate revisions by the same user not shown) | |||
| Line 34: | Line 34: | ||
==General== | ==General== | ||
*Common abdominal [[pediatric pathology|pediatric]] tumour. | *Common abdominal [[pediatric pathology|pediatric]] tumour. | ||
**Affects approximately 1 in 8000 children. | |||
**There is no sex predilection and the mean patient age at diagnosis ranges among 37 to 43 months. | |||
*May be associated with a syndrome:<ref>URL: [http://emedicine.medscape.com/article/989398-overview http://emedicine.medscape.com/article/989398-overview]. Accessed on: 9 March 2011.</ref> | *May be associated with a syndrome:<ref>URL: [http://emedicine.medscape.com/article/989398-overview http://emedicine.medscape.com/article/989398-overview]. Accessed on: 9 March 2011.</ref> | ||
**WAGR syndrome (Wilms tumour, Aniridia (absence of iris), GU abnormalities, Retardation).<ref>{{OMIM|194072}}</ref> | **WAGR syndrome (Wilms tumour, Aniridia (absence of iris), GU abnormalities, Retardation).<ref>{{OMIM|194072}}</ref> | ||
| Line 40: | Line 42: | ||
==Gross== | ==Gross== | ||
* | Features <ref name="pmid10193955">{{Cite journal | last1 = Coppes | first1 = MJ. | last2 = Arnold | first2 = M. | last3 = Beckwith | first3 = JB. | last4 = Ritchey | first4 = ML. | last5 = D'Angio | first5 = GJ. | last6 = Green | first6 = DM. | last7 = Breslow | first7 = NE. | title = Factors affecting the risk of contralateral Wilms tumor development: a report from the National Wilms Tumor Study Group. | journal = Cancer | volume = 85 | issue = 7 | pages = 1616-25 | month = Apr | year = 1999 | doi = | PMID = 10193955 }}</ref> | ||
*Most nephroblastomas are unifocal. | |||
**Usually solitary, rounded, multilobular masses sharply demarcated from adjacent parenchyma. | |||
**The cut surface is most commonly pale grey or tan. | |||
**Cyst most be prominent in some cases. | |||
*Multifocal masses in a single kidney and bilateral primary lesions are less frequent. | |||
===Images=== | ===Images=== | ||
| Line 53: | Line 60: | ||
Features - classically three components (blastema, immature stroma, tubules):<ref name=Ref_PCPBoD8_254-5>{{Ref PCPBoD8|254-5}}</ref> | Features - classically three components (blastema, immature stroma, tubules):<ref name=Ref_PCPBoD8_254-5>{{Ref PCPBoD8|254-5}}</ref> | ||
#Malignant [[Small round blue cell tumours|small round blue cells]] ("blastema"): | #Malignant [[Small round blue cell tumours|small round blue cells]] ("blastema"): | ||
#*The blastemal component is the least differentiated cellular element. | |||
#*Size = ~ 2x RBC diameter. | #*Size = ~ 2x RBC diameter. | ||
#*Nuclear pleomorphism (variation of size, shape and staining). | #*Nuclear pleomorphism (variation of size, shape and staining). | ||
| Line 62: | Line 70: | ||
#**Elliptical nuclear membrane. | #**Elliptical nuclear membrane. | ||
#**Abundant loose cytoplasm. | #**Abundant loose cytoplasm. | ||
# | #Epithelial components ("tubules"): | ||
#* | #*Primitive rossete-like tubules, well-formed maturing and mature tubules, glomerular structures and variably papillary architecture. | ||
#* | #**Usually clustered. | ||
#*Usu. have a central (clear/white) space surrounded by a rim of intensely eosinophilic cytoplasm. | #**Usu. have a central (clear/white) space surrounded by a rim of intensely eosinophilic cytoplasm. | ||
#*Nuclei of tubular structures often elongated and palisaded. | #**Nuclei of tubular structures often elongated and palisaded. | ||
Other findings: | Other findings: | ||
| Line 112: | Line 120: | ||
*CD56 +ve.<ref name=pmid11688464>{{Cite journal | last1 = Muir | first1 = TE. | last2 = Cheville | first2 = JC. | last3 = Lager | first3 = DJ. | title = Metanephric adenoma, nephrogenic rests, and Wilms' tumor: a histologic and immunophenotypic comparison. | journal = Am J Surg Pathol | volume = 25 | issue = 10 | pages = 1290-6 | month = Oct | year = 2001 | doi = | PMID = 11688464 }}</ref> | *CD56 +ve.<ref name=pmid11688464>{{Cite journal | last1 = Muir | first1 = TE. | last2 = Cheville | first2 = JC. | last3 = Lager | first3 = DJ. | title = Metanephric adenoma, nephrogenic rests, and Wilms' tumor: a histologic and immunophenotypic comparison. | journal = Am J Surg Pathol | volume = 25 | issue = 10 | pages = 1290-6 | month = Oct | year = 2001 | doi = | PMID = 11688464 }}</ref> | ||
**-ve in [[metanephric adenoma]]. | **-ve in [[metanephric adenoma]]. | ||
==Molecular== | |||
*Cytogenetics<ref>{{Cite journal | last1 = Md Zin | first1 = R. | last2 = Murch | first2 = A. | last3 = Charles | first3 = A. | title = Pathology, genetics and cytogenetics of Wilms' tumour. | journal = Pathology | volume = 43 | issue = 4 | pages = 302-12 | month = Jun | year = 2011 | doi = 10.1097/PAT.0b013e3283463575 | PMID = 21516053 }}</ref> | |||
**Partial gains of 1q. | |||
**Partial losses of 1p, 1q, 4q, 11q, 16q, 22q. | |||
**Complete loss of chromosome 16, 11, 12, 22. | |||
**Trisomy of chromosome 8, 12, 13, 18. | |||
==See also== | ==See also== | ||