OBJECTIVES: To retrospectively evaluate whether sonoelastographic evaluation could help predict the presence of an invasive focus in nonpalpable DCIS diagnosed at US-guided needle biopsy. METHODS: One hundred and three consecutive nonpalpable DCIS lesions diagnosed at US-guided needle biopsy were analyzed. To identify the preoperative factors associated with upgrade to invasive cancers on surgical histology, lesion size, B-mode US findings, elasticity score, biopsy variables, and histological variables were analyzed using univariate and multivariate logistic regression. Interobserver agreement for the elasticity score was evaluated using the multi-rater κ statistics. RESULTS: The overall upgrade rate was 23% (24 of 103). Elasticity score was found to be the only independent predictor of invasion. The upgrade rates according to the median elasticity score was 6.7% (1 of 15) for a score of 1, 20.6% (13 of 63) for a score of 2, and 40.0% (10 of 25) for a score of 3 (Odds ratio [OR] = 1; OR = 4.19, P = 0.207; OR = 12.32, P = 0.039, respectively). No association was found between other factors and the upgrade rate. The overall interobserver agreement for the elasticity score was moderate (κ = 0.587; P < .001). CONCLUSIONS: Sonoelastographic lesion stiffness is an independent preoperative predictor of invasion in some patients with nonpalpable DCIS at US-guided needle biopsy.
OBJECTIVES: To retrospectively evaluate whether sonoelastographic evaluation could help predict the presence of an invasive focus in nonpalpable DCIS diagnosed at US-guided needle biopsy. METHODS: One hundred and three consecutive nonpalpable DCIS lesions diagnosed at US-guided needle biopsy were analyzed. To identify the preoperative factors associated with upgrade to invasive cancers on surgical histology, lesion size, B-mode US findings, elasticity score, biopsy variables, and histological variables were analyzed using univariate and multivariate logistic regression. Interobserver agreement for the elasticity score was evaluated using the multi-rater κ statistics. RESULTS: The overall upgrade rate was 23% (24 of 103). Elasticity score was found to be the only independent predictor of invasion. The upgrade rates according to the median elasticity score was 6.7% (1 of 15) for a score of 1, 20.6% (13 of 63) for a score of 2, and 40.0% (10 of 25) for a score of 3 (Odds ratio [OR] = 1; OR = 4.19, P = 0.207; OR = 12.32, P = 0.039, respectively). No association was found between other factors and the upgrade rate. The overall interobserver agreement for the elasticity score was moderate (κ = 0.587; P < .001). CONCLUSIONS: Sonoelastographic lesion stiffness is an independent preoperative predictor of invasion in some patients with nonpalpable DCIS at US-guided needle biopsy.
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