FIGURE 1. (Top) Anterior end of study views in 3 different patients: IM SNs (dashed arrows) and axillary SNs (solid arrows). (Bottom) 8-min sequence of lateral views. First frame shows SN from perilesional injection. Second frame shows injection (activity in syringe) at areolar cutaneous junction. Rapid rise in SN activity levels in subsequent frames is noted. Inverted J pattern is seen from upward tenting of lymphatic channels due to raised arm position (fourth frame). LB = LymphoBoost.