Morel-Lavallée lesion

Full Definition

A specific type of soft tissue injury where shearing forces separate the subcutaneous tissue from the underlying fascia, creating a potential space that fills with blood, lymphatic fluid, and necrotic tissue. These lesions commonly occur over the greater trochanter, sacrum, and flank following high-energy trauma such as motor vehicle accidents. Recognition is important because these lesions can become infected, expand, or interfere with subsequent surgical procedures if not properly managed.

Usage

Usage note: Named after French physician Maurice Morel-Lavallée. Hyphenate the surname and capitalize both parts.

In Context

• "MRI confirmed a large Morel-Lavallée lesion over the left greater trochanter." — radiology report
• "The patient developed a chronic Morel-Lavallée lesion requiring surgical debridement." — operative note