single institution cases series review of histological and clinical data

Investigators will review all the cases with a diagnosis of primary parosteal osteosarcoma treated at the Rizzoli Institute from 1900 up to 31 July 2018, retrospectively.

Inclusion Criteria:

• Male and female patients treated at Rizzoli Institute from 01 Jan 1900 to 31 Jul 2018
• Diagnosis of parosteal osteosarcoma
• Written informed consent prior to any study-specific analysis and/or data collection

Exclusion Criteria:

• Patients with histological diagnosis different from parosteal osteosarcoma

male and female with diagnosis of parosteal osteosarcoma treated at Rizzoli institute from 01 Jan 1900 to 31 Jul 2018

No Individual Patient Data sharing plan has been implemented