Tumoral calcinosis mimicking recurrent osteosarcoma

Area of Science:

• Nephrology
• Orthopedic Oncology
• Radiology

Background:

• Tumoral calcinosis (TC) is a rare condition characterized by calcium salt deposition in soft tissues.
• Patients with chronic renal failure (CRF) have an increased risk of developing secondary tumoral calcinosis.
• Osteosarcoma is a primary bone malignancy often treated with orthopedic surgery and chemotherapy.

Observation:

• A 29-year-old woman with a history of osteosarcoma and CRF presented with symptoms mimicking recurrent osteosarcoma.
• Imaging and histological findings of tumoral calcinosis closely resembled recurrent osteosarcoma.
• The patient underwent surgical revision and biopsy due to orthopedic hardware loosening.

Findings:

• Radiographic and histological similarities between tumoral calcinosis and osteosarcoma can lead to misdiagnosis.
• Secondary tumoral calcinosis in CRF is linked to altered calcium and phosphate metabolism.
• Positron Emission Tomography (PET) and Computed Tomography (CT) imaging show potential in differentiating these entities.

Implications:

• Accurate differentiation between tumoral calcinosis and recurrent osteosarcoma is crucial for appropriate patient management.
• Advanced imaging techniques may help avoid invasive procedures like surgical biopsy in select cases.
• Understanding the pathophysiology of secondary tumoral calcinosis in renal disease is vital for clinical practice.