title: Core needle breast biopsy in patients undergoing anticoagulation therapy: preliminary results.
abstract: OBJECTIVE
  We compared complication rates of core needle breast biopsy in patients with and without concurrent anticoagulation therapy.
  
  
  METHODS
  Experience with 501 14-gauge and 179 11-gauge core needle breast biopsies was recorded prospectively. We performed 18 (3%) of 680 procedures on patients undergoing anticoagulation therapy. Eleven biopsies were performed in eight women treated with warfarin, one in a patient treated with heparin, and six in six women treated with aspirin. Ten biopsies were performed with sonographic guidance and a 14-gauge automated biopsy gun. Eight biopsies were performed with an 11-gauge vacuum-assisted probe and stereotactic guidance.
  
  
  RESULTS
  Hematomas occurred in three (38%) of eight anticoagulated patients undergoing 11-gauge vacuum-assisted stereotactic biopsy, measuring 13 mm, 17 mm, and 40 mm. In patients not known to be anticoagulated, small hematomas were mammographically evident in 77 (45%) of 171 biopsies performed with an 11-gauge probe, averaging 8 mm (range, 2-17 mm); only 13 (8%) of 171 had hematomas larger than 10 mm. Small hematomas, averaging 6 mm (range, 2-12 mm) were evident mammographically in 45 (45%) of 100 stereotactic biopsies using a 14-gauge automated biopsy gun; three (3%) experienced hematomas larger than 10 mm. A 10-mm hematoma was evident during one (10%) of the 10 biopsies performed in patients undergoing anticoagulation therapy under sonographic guidance using a 14-gauge automated biopsy gun; small hematomas (mean, 10 mm) were noted during seven (2%) of 391 corresponding sonographically guided biopsies in patients not undergoing anticoagulation therapy.
  
  
  CONCLUSIONS
  No patients undergoing anticoagulation therapy experienced clinically important complications; preliminary results suggest rates of hematoma formation similar to those in the control group. As such, discontinuing anticoagulation medication before core needle breast biopsy may be unnecessary when the need for biopsy is urgent.
authors.affiliation: Department of Diagnostic Radiology, University of Maryland School of Medicine, Baltimore 21201, USA.
authors.forename: M K
authors.initials: MK
authors.lastname: Melotti
authors.forename: W A
authors.initials: WA
authors.lastname: Berg
mesh_terms: D000925:Anticoagulants / Q000009:adverse effects / Q000627:therapeutic use*; D001707:Biopsy, Needle / Q000009:adverse effects* / Q000295:instrumentation; D001940:Breast / Q000473:pathology*; D005260:Female; D006406:Hematoma / Q000209:etiology; D006470:Hemorrhage / Q000209:etiology; D006801:Humans; D011446:Prospective Studies; D012307:Risk Factors; D018084:Ultrasonography, Interventional
chemical_list: D000925:Anticoagulants