Rotation-advancement flaps are key techniques for closing scalp defects after tumor removal, especially large ones, using nearby hair-bearing skin to restore aesthetics and function by rotating tissue around the defect, often based on scalp arteries (temporal, occipital) for blood supply, minimizing tension and providing similar tissue for a good cosmetic result, sometimes combined with skin grafting for donor sites.
How They Work
Design: Dermatosurgeons map a flap adjacent to the tumor defect, often larger than the defect itself, incorporating a major scalp artery (like the superficial temporal artery or occipital artery) for vascularity.

Movement: The flap is lifted and rotated (like a pivot) or slid (advanced) into the defect, covering the exposed bone or pericranium.
Closure: The donor area, where the flap was raised, is closed. If it’s too large for direct closure, it’s often covered with a skin graft, creating a bald patch.
Advantages for Scalp Tumors
Tissue Matching: Uses hair-bearing scalp to match the defect, offering better cosmetic outcomes than skin grafts alone.
Robust Blood Supply: Leverages the scalp’s rich vascular network for flap survival.
Complex Defects: Ideal for larger defects, those involving exposed bone (requiring pericranium coverage), or when simpler closures fail.
Tension Management: Redirects tension away from free edges, preventing distortion of the hairline or other facial features.
Important considerations
Hairline Distortion: Flap movement can alter the hairline, requiring careful design.
Donor Site: Leaving a secondary defect often requires/ could require grafting, which results in a bald area.
Patient Factors: Previous radiation, age, and defect size influence design/ resection margin mapping preoperatively and final success