The Tree Flap: A Novel Modification of the Hatchet Flap for Lower One-third Nasal Reconstruction.

Nasal reconstruction after skin cancer excision has routinely been challenging without any aesthetic sequelae, and any defects on the nose are readily noticeable. To circumvent this problem, surgeons have developed different flap techniques to mobilize adjacent tissue to repair aesthetically sensitive defects. We describe our experience, outcomes, and valuable tips for using the "tree flap," a novel modification of the hatchet flap that extends the back cut to significantly increase mobility, leaving only a small skin paddle to maintain perfusion to the flap. The combination of undermining, a rotatory component, and minimal skin attachment allows radical mobility without compromising blood supply. Thus, the tree flap allows for reconstruction of defects of the dorsum of the nose and defects near the nasal tip with ease, given both advancement and rotational movements. Compared with other local flaps such as the shark pedicle flap or bilobed flap, the tree flap has a similar learning curve, minimal donor site morbidity, and equivalent aesthetic outcome. It may be used to repair larger defects that may not be amenable to the bilobed flap as an alternative to a full-thickness skin graft. In our experience, the tree flap also has the advantage of a lower rate of pin cushioning when compared with other options such as the bilobed flap. The tree flap has great mobility and is a reliable option for reconstruction of the lower one-third of the nose with excellent aesthetic results and minimal complications.