Objective: To determine the minimum number of stereotactic biopsy specimens containing calcifications sufficient for pathologic diagnosis and the minimum number of specimens containing calcifications sufficient for immunohistochemistry (IHC) in cases of malignancy.
Methods: In this IRB-exempt quality assurance initiative, individual specimens from 126 patients with 129 calcified targets retrieved using a stereotactic system with real time specimen imaging were prospectively analyzed. Pathology was reported independently for each specimen containing calcifications. In every case, the pathologist reported which specimen containing calcifications was sufficient for diagnosis and, in cases of malignancy, which calcified specimen was sufficient for diagnosis and IHC.
Results: A diagnosis was made from the first calcified specimen in 74% of cases (95/129), from the first two calcified specimens in 92% (119/129) of cases, and from the first three calcified specimens in 100% of cases. Pathology was benign in 66% (85/129) of cases, with the diagnosis made from the first calcified specimen in 78% (66/85) of cases. High-risk lesions were the primary pathology in 8% (11/129) of cases, with 55% (6/11) diagnosed from the first calcified specimen. Pathology was malignant in 26% (33/129) of cases. The first calcified specimen was sufficient for diagnosis and IHC in 73% (24/33) of malignancies and the first three calcified specimens were sufficient for diagnosis and IHC in all cases of malignancy.
Conclusion: Three cores verified to contain calcifications on real time specimen imaging were sufficient to make a diagnosis in all cases and to make a diagnosis and obtain IHC in nearly all cases of malignancy.
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