Symmastia: the problem of medial confluence of the breasts.

This paper presents the problem of medial confluence of the breasts producing a web across the midline. Significant references in the literature dealing with uncommon clinical problems are virtually nonexistent. The purpose of this paper is to stimulate discussion of this entity and its surgical management and to propose the term symmastia to facilitate retrieval of information about this entity in the future. Two cases that highlight the central problem but which differ in the specifics of the surgical approach are presented. In the first case, the medial web was corrected by elevating an inferiorly based triangular skin flap that was advanced superiorly in an inverted Y-V manner after the excess medial soft tissue was divided and sutured superiorly to the medial pectoralis fascia to create a brassiere-band sling effect. In the second case, a superiorly based medial flap containing both skin and soft tissue was elevated. The excess skin and soft tissue were then excised. The remaining flap was tailored to fit into a V-shaped defect in the inferior incision to place the scar in a less viable place inferior to the sternum. The relative advantages of the two surgical approaches are discussed and a third approach based on the strengths of the two approaches is suggested. This approach would consist of the vertical division and superior rotation of the excess subcutaneous tissue flaps and the elevation of a superiorly based skin flap inserted into a V-shaped defect in the inferior incision.