American Journal of Roentgenology, Vol 173, 227-229, Copyright © 1999 by American Roentgen Ray Society

ARTICLES

Stereotactic biopsy of ductal carcinoma in situ of the breast using an 11-gauge vacuum-assisted device: persistent underestimation of disease

B Won, HE Reynolds, CL Lazaridis and VP Jackson
Department of Radiology, University Hospital, Indiana University School of Medicine, Indianapolis 46202, USA.

OBJECTIVE: The purpose of this study was to compare the diagnostic accuracy of 14-gauge automated gun and 11-gauge directional vacuum- assisted biopsy techniques in the diagnosis of ductal carcinoma in situ of the breast. MATERIALS AND METHODS: We retrospectively reviewed 41 consecutive lesions that had been diagnosed as ductal carcinoma in situ using stereotactic needle biopsy. The first 21 lesions had been biopsied using a 14-gauge automated gun; the remaining 20 lesions, using an 11-gauge vacuum-assisted device. Surgical histopathologic results at lumpectomy were compared with the findings at needle biopsy and defined as either concordant, when only ductal carcinoma in situ (i.e., no evidence of invasive carcinoma) was evident at surgery, or discordant, when invasive carcinoma was found. One patient from the automated gun group was lost to follow-up and was not included in the analysis. RESULTS: Invasive carcinoma was found at surgery in seven (35%) of the 20 cases diagnosed using the automated gun compared with three (15%) of the 20 cases diagnosed using the vacuum-assisted device (p = .13). In all three of these discordant vacuum-assisted cases, only microinvasive disease was found at surgery. However, in only two of the seven discordant automated gun cases was only microinvasive disease found at surgery. CONCLUSION: The 11-gauge directional vacuum-assisted biopsy technique may improve the accuracy of ductal carcinoma in situ diagnosis. Underestimation of disease still occurs, however.
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