XXXX dye-related changes in the breast after sentinel lymph node localization.

@entity1 @entity6693 @entity0 @entity39
OBJECTIVES: The purpose of this study was to investigate the frequency and appearance of changes in the breast on sonography in @entity1 after @entity0 surgery including sentinel lymph node localization using @entity6693 dye. METHODS: Three hundred thirty-seven consecutive @entity1 who underwent breast-conserving surgery in 2006 underwent breast sonography during 2 years after surgery. Sentinel lymph node localization using @entity6693 dye was selectively performed. We retrospectively analyzed the unexplained focal lesions not at the lumpectomy site on sonography and investigated whether these findings were associated with sentinel lymph node localization. RESULTS: Unexplained focal lesions were identified in 36 (14.1%) of 256 @entity1 who had undergone sentinel lymph node localization. The lesions were in the periareolar region (n = 26; outer in 16, upper in 6, inner in 2, and lower in 2) or the retroareolar region (n = 10). The lesion appeared with a fat @entity39 -like pattern in the subcutaneous fat layer in 24 (66.7%) or as an irregular mass in the glandular layer in 12 (33.3%). The unexplained focal lesions were pathologically proven benign (n = 10) or were improved or stable during 2 years of imaging follow-up after surgery (n = 26). The unexplained focal lesions in 2 (2.5%) of 81 @entity1 without sentinel lymph node localization were in the nonareolar region, and 1 of these was a recurrence. CONCLUSIONS: After sentinel lymph node localization using @entity6693 dye, breast sonography can show unexplained focal lesions in the periareolar and retroareolar regions. Although most of the changes suggest fat @entity39 , an irregular parenchymal mass can develop and mimic a recurrence.
