The propose of this study is to evaluate the clinical outcome after US guided mammotome excision of benign breast lesions and to investigate the clinical, radiological and pathologic features in cases of recurrence.
From March 2005 to July 2008, 125 US mammotome biopsies were performed in our institution. Among them, we performed the mammotome biopsy for the purpose of the excision of breast lesions in 91 cases. Our study included 11cases which showed recurrence after mammotome excision . Clinical, radiological and pathologic features were analyzed to presume the risk factors of the recurrence.
The US mammotome excisions were performed with 8G needle in 10 cases and 11G in one case. 3 were benign phyllodes tumors(27%), 5 were fibroadenomatoid hyperplasia(46%) and 3 were fibroadenomas(27%). All masses showed US findings compatible to BI-RADS Category 3. Mean size was 19mm (10mm~35mm) . Mean distance from the lesion to skin was 6mm (3mm~10mm) and mean distance from the lesion to pectoralis muscle was 3mm(0~5mm). Sampling numbers were varied according to the lesion size (mean=21,from 8 to 68). Mean interval between removal and recurrence were 14 months (6~24months). All benign phyllodes tumors(n=3) were recurred after the excision but all intraductal papillomas (n=6) showed no recurrence during follow up.
In case of benign phyllodes tumor, surgical excision may be more curable than US mammotome excision. We should explain to patients about possibility of recurrence when the mass is close to pectoralis muscle. And long term follow up will be necessary for the evaluation of delayed recurrence.