
Keywords: Anaplastic hemangiopericytoma; Hemangiopericytoma; Prognosis; Recurrence; Treatment; AHPC; Anaplastic hemangiopericytoma; CI; Confidence interval; GTR; Gross total resection; HPC; Hemangiopericytoma; HR; Hazard ratio; IQR; Interquartile range; KPS; Karnof