Methotrexate osteopathy.

Area of Science:

• Pediatric Oncology
• Skeletal Radiology
• Pharmacology

Background:

• Childhood neoplasms, particularly acute lymphocytic leukemia, often require long-term oral maintenance therapy.
• Methotrexate is a common chemotherapeutic agent used in such treatments.
• Long-term use can lead to uncommon skeletal complications.

Observation:

• Methotrexate osteopathy presents with severe lower extremity pain.
• Radiographic findings include osteoporosis, dense provisional zones of calcification, and growth arrest lines.
• These features can resemble scurvy on imaging.

Findings:

• The condition is characterized by significant bone density loss, predominantly in the lower extremities.
• Distinctive calcification patterns and growth arrest lines are key diagnostic indicators.
• Pathological fractures can occur as a complication.

Implications:

• Accurate diagnosis is crucial to differentiate methotrexate osteopathy from disease recurrence or metastasis.
• Understanding this complication aids in monitoring patients undergoing long-term methotrexate therapy.
• This knowledge can inform treatment adjustments and management strategies to mitigate skeletal toxicity.