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Figure 1b. Biopsy was successful in a 59-year-old woman despite moderate positioning problems. (a) Mediolateral prebiopsy stereotactic mammograms obtained with a "target-on-scout" technique (13) show an indistinct 12-mm mass (arrow) close to a silicone-filled subglandular implant (arrowheads). An electronic square marker is at the center of the mass. There is firm compression of the suboptimally displaced implant but only moderate compression of the adjacent breast tissue. (b) Mediolateral stereotactic mammograms show that the 11-gauge vacuum-assisted biopsy probe has been fired outside the breast and manually inserted to the postfire position. The mass (arrow) has been pushed deeper into the breast, and the electronic square marker is no longer at the center of the mass. To complete the biopsy, the sampling notch (arrowhead) of the probe was pushed farther into the breast to the new depth of the mass and rotated 180° away from the implant and toward the mass. Histopathologic slides (not shown) of 15 tissue samples revealed fat necrosis, inflammation, and fibrosis. Mammograms (not shown) revealed decreased mass size 10 months after biopsy and stability 44 months after biopsy.