True about Sentinel Lymph node biospy ?

Ans. is 'b' i.e. Blue dyes injected No special OT is required, SLN biopsy is usually done intraoperatively by using isosulphan blue dye (lymphazurin) or radioactive colloid. Accuracy in detection of SLN is best when both the methods are combined. When radioactive colloid is used, the SLN is detected by a gamma-camera. The blue dye colours the afferent lymphatics and the SLN, hence aids in the identification SLN Biopsy (for breast ca) is contraindicated in : palpable lymphadenopathy prior axillary surgery, chemotherapy or radiation therapy multifocal breast cancers