Aggressive atraumatic myositis ossificans in a toddler

Area of Science:

• Orthopedics
• Pediatric Radiology
• Pathology

Background:

• Myositis ossificans (MO) is a benign condition characterized by heterotopic ossification in muscle or soft tissues.
• Typically associated with trauma, MO is uncommon in the pediatric population.
• Early-stage imaging findings can be nonspecific, complicating diagnosis.

Observation:

• A 2-year-old male presented with myositis ossificans affecting his right elbow.
• The condition developed without any apparent preceding trauma to the affected area.
• Initial imaging studies were unspecific for the diagnosis.

Findings:

• The case underscores the diagnostic challenges in pediatric myositis ossificans, particularly when trauma is absent.
• Biopsies in early stages may yield misleading pathological reports.
• Myositis ossificans can present diagnostic and therapeutic difficulties despite often being self-limiting.

Implications:

• This case emphasizes the need for careful clinical correlation and consideration of MO in pediatric patients with unexplained soft tissue masses.
• It highlights the limitations of initial imaging and biopsy in diagnosing early-stage MO.
• Further research into non-invasive diagnostic methods for pediatric MO is warranted.