Bilateral Lower Extremity Calcific Myonecrosis: A Case Report.

Introduction: Calcific myonecrosis is a rare soft-tissue disease where a single muscle or muscle compartment is replaced with central liquefaction and peripheral calcification. This disease usually occurs in a single limb after trauma. Until now, bilateral muscle involvement has not been previously reported.

Case Report: A 73-year-old woman presented with symptomatic masses in the soft tissues of bilateral anterior thighs. She had no known history of trauma but recalled a specific tearing sensation episode in both her legs while squatting when weightlifting in the distant past. The patient had calcified masses that had replaced the rectus femoris muscle bilaterally with associated effects on hip and knee range of motion. The patient underwent excision of a portion of calcific myonecrosis and two locations of rectus femoris tenotomies in one leg and only a simple rectus femoris tenotomy on the contralateral leg. The patient subsequently experienced a significant improvement in hip and knee motion and a reduction in associated pain on both sides.

Conclusion: Historical and radiographic information are key in making the diagnosis of calcific myonecrosis. Treatment decisions should be based on the patient's symptoms balanced with the morbidity of the expected procedures. Symptomatic patients should be considered for excision of the symptomatic involved areas. A tenotomy may be a viable option if a limitation in motion is the primary complaint. Asymptomatic patients with a stable lesion and imaging should undergo conservative management due to the high risk of infection and wound healing problems.