A Defect-Geometry-Driven Framework for Columellar Reconstruction: A Focused Narrative Review With a Pediatric Philtral V-Y Advancement Flap Case

Columellar reconstruction remains one of the most challenging problems in facial reconstruction because it requires restoration of external cover, internal lining, structural support, and aesthetic harmony within a small but anatomically complex nasal subunit. This focused narrative review examines contemporary reconstructive techniques for columellar defects, proposes a defect-geometry-driven reconstructive framework, and illustrates its application in a pediatric patient with partial columellar loss. Reconstructive techniques published between 1986 and 2026 were assessed according to defect geometry, reconstructive complexity, lining requirements, structural support, and reported advantages and limitations. The reviewed literature demonstrated substantial heterogeneity, ranging from simple graft-based procedures to multilayer regional and microsurgical reconstruction. Based on the available evidence, a conceptual framework emphasizing progressive restoration of external cover, internal lining, and structural support was developed. Within this framework, partial defects with preserved internal lining but deficient projection or structural support emerged as a distinct intermediate reconstructive category. A pediatric patient with partial columellar loss secondary to neonatal nasal cannula-related pressure necrosis underwent reconstruction using a philtral V-Y advancement flap combined with a septal cartilage strut graft and showed satisfactory structural and aesthetic outcomes at 1-year follow-up. Columellar reconstruction should be guided not only by defect size but also by anatomic layer deficiency and defect geometry. The proposed framework may facilitate more anatomy-oriented, patient-specific surgical decision-making, and the philtral V-Y advancement flap may represent a useful intermediate option between simple resurfacing procedures and more complex multilayer reconstruction strategies in selected partial columellar defects.