Biomedical subjects
John Henry MacGregor
Publications and source records attributed to John Henry MacGregor.
Ultrasonographic findings 6 months after 11-gauge vacuum-assisted large-core breast biopsy.
OBJECTIVE: To assess the ultrasonographic features of post-biopsy change 6 months after 11-gauge vacuum-assisted large-core breast biopsy of pathologically proven benign lesions. Using the literature as a reference, we hypothesized that large-core breast biopsy would result in tissue changes that may mimic malignancy and may be more apparent on ultrasonography than on mammography. METHODS: Two radiologists whose subspecialty is breast imaging retrospectively reviewed the pre-biopsy and 6-month follow-up sonograms of 24 patients with pathologically proven benign lesions. The images were assessed for the number and type of ultrasonographic features. A Breast Imaging Reporting and Data System (BI-RADS) category was assigned to each lesion before biopsy and at 6-month follow-up. The composition of breast tissue surrounding the lesion was assessed as fatty, mixed fibroglandular or dense. RESULTS: The frequency of ultrasonographic changes at 6 months after 11-gauge vacuum-assisted large-core breast biopsy was more frequent than the rate of post-biopsy change previously reported to occur mammographically. The nature of these changes may mimic malignancy in some cases. CONCLUSION: The ultrasonographic appearance of the breast after large-core breast biopsy may mimic malignancy and is, therefore, a potential pitfall when interpreting a post-biopsy sonogram.
Trauma-induced omental herniation simulating pleural effusion: case report.
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Soft-tissue case 43. Cecal volvulus: differentiating distended viscus from pneumoperitoneum.
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Accuracy of marker clip placement after mammotome breast biopsy.
OBJECTIVE: To assess, after stereotaxic, vacuum-assisted breast biopsy, the accuracy of marker clip deployment for guiding subsequent needle localization procedures and surgery. METHODS: We conducted a retrospective review of 100 vacuum-assisted core breast biopsies that were followed by marker clip deployment. Craniocaudal (CC) and mediolateral oblique (MLO) mammograms were used to locate clips relative to the centre of the target lesion in 5-mm increments. RESULTS: In the 94 of 100 cases adequate for review, maximum marker clip displacement of less than 10 mm on either the CC or MLO views was observed in 68 (72%) cases. In 9 (10%) cases, the localization clip was positioned more that 24 mm from the target lesion. CONCLUSION: Post-biopsy CC and MLO radiographs are recommended to identify those cases in which there is a significant difference between the location of the marker clip and the biopsied lesion.