Bony Hyperplasia Beneath Atrophic Soft Tissue: A Rare Case of En Coup de Sabre and Literature Review

In this study, we report a rare case of en coup de sabre with hyperplasia of the left frontal bone beneath skin lesion, which is detected during magnetic resonance imaging screening and preoperative evaluation. A 27-year-old woman with 13-year history of progressive soft tissue depression in the forehead and scalp, and was treated by traditional Chinese herb before the disease went into stationary stage. The patient underwent serial long-pulsed laser treatments and autologous fat grafting with satisfactory outcome. To our knowledge, this is the first time that bony hyperplasia beneath the soft tissue lesion was found in a patient with en coup de sabre.