Pathology Quiz: Small Cell Ostosarcoma

A 15-year-old black male presented with shortness of breath, leg weakness, and pain in his back and rib cage. Four years previously he had noticed a lump in his upper back and complained of pain when playing basketball, especially on contact to that area. Recently, the pain had become more constant and increased in intensity. This was associated with loss of control in his legs, weakness, and parasthesia. General physical examination revealed a palpable mass in the right midline upper back. Laboratory results were within normal limits. Radiographic scans demonstrated a destructive soft tissue mass at T6 vertebral body with scattered stippled calcification (Figure 1). The patient underwent a biopsy followed by excision of the mass (Figure 2) and decompressive laminectomy with reconstruction.