Unilateral Lambdoid Synostosis Treated with the Convex-Concave Exchange Method: A Retrospective Case Series

Objectives: Unilateral lambdoid synostosis (ULS) is a rare condition whose diagnosis is often delayed as it is difficult to distinguish from positional plagiocephaly. If ULS diagnosis is delayed, a single-stage cranioplasty or cranial distraction is commonly performed instead of a strip craniectomy. However, many variations of these procedures exist, and there is, as of yet, no standard method. We herein describe the details of the "convex-concave exchange (CCE) method," a novel surgical technique that has been developed by us to treat several cases of ULS, and retrospectively evaluate its efficacy.