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'''Atypical ductal hyperplasia''', abbreviated '''ADH''', a benign breast lesion associated with an increased risk of [[malignancy]]. | |||
==General== | |||
*Molecular studies have shown it is the same thing as low-grade DCIS; thus, some have called for abolition of the term.<ref>{{Cite journal | last1 = Ghofrani | first1 = M. | last2 = Tapia | first2 = B. | last3 = Tavassoli | first3 = FA. | title = Discrepancies in the diagnosis of intraductal proliferative lesions of the breast and its management implications: results of a multinational survey. | journal = Virchows Arch | volume = 449 | issue = 6 | pages = 609-16 | month = Dec | year = 2006 | doi = 10.1007/s00428-006-0245-y | PMID = 17058097 }}</ref> | |||
*ADH is considered an indication for a lumpectomy.<ref name=pmid7717215>{{cite journal |author=Liberman L, Cohen MA, Dershaw DD, Abramson AF, Hann LE, Rosen PP |title=Atypical ductal hyperplasia diagnosed at stereotaxic core biopsy of breast lesions: an indication for surgical biopsy |journal=AJR Am J Roentgenol |volume=164 |issue=5 |pages=1111–3 |year=1995 |month=May |pmid=7717215 |doi= |url=http://www.ajronline.org/cgi/pmidlookup?view=long&pmid=7717215}}</ref> | |||
**Two large studies suggest the conversion of an ADH on core biopsy to breast cancer on surgical excision, known as "up-grading", is approximately 30%.<ref name=pmid20619647>{{Cite journal | last1 = Deshaies | first1 = I. | last2 = Provencher | first2 = L. | last3 = Jacob | first3 = S. | last4 = Côté | first4 = G. | last5 = Robert | first5 = J. | last6 = Desbiens | first6 = C. | last7 = Poirier | first7 = B. | last8 = Hogue | first8 = JC. | last9 = Vachon | first9 = E. | title = Factors associated with upgrading to malignancy at surgery of atypical ductal hyperplasia diagnosed on core biopsy. | journal = Breast | volume = 20 | issue = 1 | pages = 50-5 | month = Feb | year = 2011 | doi = 10.1016/j.breast.2010.06.004 | PMID = 20619647 }}</ref><ref name=pmid16978969>{{Cite journal | last1 = Margenthaler | first1 = JA. | last2 = Duke | first2 = D. | last3 = Monsees | first3 = BS. | last4 = Barton | first4 = PT. | last5 = Clark | first5 = C. | last6 = Dietz | first6 = JR. | title = Correlation between core biopsy and excisional biopsy in breast high-risk lesions. | journal = Am J Surg | volume = 192 | issue = 4 | pages = 534-7 | month = Oct | year = 2006 | doi = 10.1016/j.amjsurg.2006.06.003 | PMID = 16978969 }}</ref> | |||
Epidemiology: | |||
*Relative risk of breast cancer, based on a median follow-up of 8 years, in a case control study of US registered nurses, is 3.7.<ref name=pmid1734106>{{Cite journal | last1 = London | first1 = SJ. | last2 = Connolly | first2 = JL. | last3 = Schnitt | first3 = SJ. | last4 = Colditz | first4 = GA. | title = A prospective study of benign breast disease and the risk of breast cancer. | journal = JAMA | volume = 267 | issue = 7 | pages = 941-4 | month = Feb | year = 1992 | doi = | PMID = 1734106 }}</ref> | |||
==Microscopic== | |||
Features: | |||
*Cytologic and architectural feature of low-grade DCIS. | |||
**Cell spacing ~ equal. | |||
**Lumina round. | |||
**Architecture - classically ''cribriform'' or ''solid''; may be ''micropapillary'' or ''papillary''. | |||
**Small nuclei. | |||
***Small indistinct nucleoli. | |||
*Limited extent ([[diagnostic size cutoffs]]) - either:<ref>{{Ref DCHH|258}}</ref> | |||
*#< Two complete ducts. | |||
*#< 2 mm. ‡ | |||
DDx: | |||
*Low-grade [[DCIS]]. | |||
*[[Florid epithelial hyperplasia of the usual type]] (FEHUT). | |||
Notes: | |||
*''High-grade DCIS'' is '''not''' in the [[DDx]] of ADH. | |||
* ‡ 3 mm is used in papillary lesions.{{fact}} | |||
===Images=== | |||
<gallery> | |||
Image:Atypical_ductal_hyperplasia_-_very_low_mag.jpg|ADH. Very low mag. (WC/Nephron) | |||
Image:Atypical_ductal_hyperplasia_-_high_mag.jpg|ADH - high mag. (WC/Nephron) | |||
</gallery> | |||
===IHC=== | |||
*CK5 <20% +ve. | |||
*ER +ve - diffusely. | |||
**Heterogenous in [[FEHUT]]. | |||
==See also== | |||
*[[Non-invasive breast carcinoma]]. | |||
==References== | |||
{{Reflist|1}} | |||
[[Category:Breast pathology]] | |||
[[Category:Diagnosis]] | [[Category:Diagnosis]] | ||