Abstract
Purpose
This study sought to evaluate the accuracy of vacuum-assisted biopsy (VAB) in the diagnosis of atypical ductal hyperplasia (ADH) by determining the rate of VAB underestimation compared with definitive histology. In addition, an attempt was made to identify parameters that could help determine the most appropriate patient management.
Materials and methods
We retrospectively reviewed 1,776 VAB procedures performed between November 1999 and January 2008 for suspicious subclinical breast lesions visible only at mammography. A total of 177 patients with a VAB diagnosis of pure ADH were studied. Patients with a diagnosis of ADH associated with other lesions (lobular intraepithelial neoplasia, papilloma), atypical lobular hyperplasia, lobular carcinoma in situ and any lesions with a microhistological diagnosis other than ADH were excluded. Mammographic appearance of lesions was as follows: 152 mostly clustered microcalcifications (86%); five opacities with microcalcifications (3%); 12 single opacities (3%); and eight parenchymal distortions (4%), of which five were without and three were with microcalcifications. In cases underestimated by VAB, we evaluated the extent of ADH within ducts and lobules. Based on results, patients were subdivided into two groups: ≤2 ADH foci; >2 ADH foci. Patients were subdivided into two groups: one was referred for surgery and the other for follow-up care. The decision to either perform or not perform surgery was based on combined analysis of the following parameters: patient age; risk factors in the patient’s history; mammographic extent of microcalcifications; complete excision of microcalcifications at VAB; and final Breast Imaging Reporting and Data System (BI-RADS) assessment.
Results
In the first group (n=98), comparison of microhistology with final histology revealed that 19 cases of ADH had been underestimated by VAB. In the second group (n=79), six cases of ADH showed progression of the mammographic abnormality, which was subsequently confirmed by surgical biopsy.
Conclusions
The most relevant parameters affecting the decision to proceed to surgical excision were lesion diameter >7 mm on mammography, >2 ADH foci, incomplete removal of the calcifications and a family and/or personal history of breast cancer. Although there are no definite mammographic predictors of malignancy, a radiological assessment of suspicious lesion in the presence of an additional equivocal parameter always warrants surgical management.
Riassunto
Obiettivo
Scopo del nostro lavoro è stato valutare l’accuratezza della vaccum assisted biopsy (VAB) nella diagnosi di iperplasia duttale atipica (ADH), individuando le sottostime della metodica rispetto all’esame istologico definitivo ed identificare parametri utili al corretto management delle pazienti.
Materiali e metodi
È stata effettuata un’analisi retrospettiva di 1776 VAB per lesioni mammarie sospette infracliniche, visibili solo alla mammografia, eseguite da novembre 1999 a gennaio 2008. Sono state incluse nel nostro studio 177 pazienti con diagnosi VAB di ADH pura; sono state escluse le pazienti con diagnosi di ADH associata ad altre lesioni (neoplasia intraepiteliale lobulare [LIN], papilloma), iperplasia lobulare atipica (ALH), carcinoma lobulare in situ (LCIS) e tutti le lesioni con diagnosi microistologiche differenti. La tipologia mammografica di tali lesioni è stata la seguente: 152 microcalcificazioni per la maggior parte in cluster (86%); 5 opacità con microcalcificazioni (3%); 12 opacità singole (3%); infine, 8 distorsioni parenchimali (4%) di cui 5 senza microcalcificazioni e 3 con microcalcificazioni. Nei casi sottostimati è stata valutata l’estensione dell’ADH all’interno dei dotti e dei lobuli dividendo le pazienti in due gruppi: ADH≤2 foci, ADH>2 foci. Le pazienti sono state suddivise in due gruppi: uno inviato ad intervento chirurgico e l’altro monitorato nel tempo. La decisione d’inviare o meno la paziente ad intervento chirurgico si è basata sull’analisi combinata dei seguenti parametri: età della paziente, eventuali fattori di rischio anamnestici, estensione mammografica delle microcalcificazioni, completa exeresi delle microcalcificazioni alla VAB e giudizio breast imaging reporting and data system (BIRADS) radiologico espresso.
Risultati
Nel primo gruppo (n=98), il confronto tra microistologia bioptica e istologia definitiva ha individuato 19 casi di ADH sottostimati dalla VAB. Nel secondo gruppo (n=79), 6 casi di ADH hanno mostrato un’evoluzione del quadro mammografico, poi confermato dalla biopsia chirurgica.
Conclusioni
Dai dati emersi nel nostro studio i parametri più rilevanti per la decisione all’exeresi della lesione sono stati: diametro mammografico>7 mm, estensione dell’ADH>2 foci, incompleta rimozione delle calcificazioni ed anamnesi familiare e/o personale di neoplasia. Sebbene non vi siano caratteristiche mammografiche predittive di malignità certa, un giudizio radiologico sospetto, in presenza di un ulteriore parametro dubbio, dovrebbe comunque indirizzare all’exeresi.
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Ancona, A., Capodieci, M., Galiano, A. et al. Vacuum-assisted biopsy diagnosis of atypical ductal hyperplasia and patient management. Radiol med 116, 276–291 (2011). https://doi.org/10.1007/s11547-011-0626-9
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DOI: https://doi.org/10.1007/s11547-011-0626-9