The application of methylene blue location technique in deep-seated benign breast tumor resection under endoscopy: a retrospective, single-institution analysis

Endoscopic curative excision of benign breast diseases (BBDs) can preserve the cosmetic appearance of the breast. However, endoscopic surgery is not feasible, and some challenges still need to be addressed. Traditional line marker localization methods cannot visualize tumors, and the exploration of deep tumors may lead to certain risks of accidental injury. This study aimed to investigate the value of the methylene blue location (MBL) technique in endoscopic resection of deep-seated benign breast tumors.