Fat graft viability and vascularization (a). (b) Example of a micro-fat (MF) nodule (dimensions 4,492 μm × 1,495 μm) still present at 2 months post injection (hematoxylin and eosin). Bars = 500 μm. Evaluation of the MF graft size suggested retention of ~6% of initial volume. (c) Number of congested capillaries (mean of capillary diameters = 19.6 μm), increased with stromal vascular fraction-derived products (hematoxylin and eosin, P <0.01). Bars = 200 μm.