Bilateral Chronic Expanding Hematomas of the Gluteus Maximus Presenting With Gluteal Muscle Contracture: A Case Report

BACKGROUND: Chronic expanding hematoma is defined as a progressively enlarging soft tissue mass persisting beyond 1 month, typically resulting from prior trauma or surgical procedures. Although the condition is rare, its occurrence within deep musculature-particularly with bilateral involvement of the gluteus maximus-is exceedingly uncommon. No previously published English-language reports were identified describing bilateral gluteus maximus hematomas associated with gluteal muscle contracture (GMC). CASE REPORT: This report describes a 29-year-old male presenting with bilateral chronic expanding hematomas involving the gluteus maximus muscles, accompanied by clinical features consistent with GMC. CONCLUSION: Chronic expanding hematoma should be considered a potential underlying etiology in individuals presenting with GMC, particularly when involving deep gluteal musculature.