MKI67 and solitary fibrous tumor: SFT: solitary fibrous tumor; C1, C2, C3, C4, C5, C6: cervical vertebrae 1 through 6; MRI: magnetic resonance imaging; LL: lower limb; UL: upper limb; PO: per oral; ED: emergency department; CD: cluster of differentiation; Bcl-2: B-cell lymphoma 2; Ki-67: Ki-67 proliferation index