- Quantification of seroma formation by ultrasound examination of 5 regions of the abdominal wall: epigastrium (EPI), umbilical (UMB), hypogastrium (HYPO), right iliac fossa (RIF) and left iliac fossa (LIF)], at two postoperative periods: (P1), between postoperative days #11 and #14, and (P2), between postoperative days #18 and #21 as described by DiMartino et al [20], as well as ultrasound of the superior, medial, lateral and inferior portions of the reconstructed breasts.