Clinical manifestations and imaging and pathological features of giant cell angioblastoma: Report of four cases and literature review oleh Qingbin Li, Qingbin Li, Zhaohua Zhang, Guocai Chen, Guocai Chen, Yongbo Hu, Yongbo Hu, Rongjun Mao, Le Xie, Shaoluan Chen, Yongqiang Lao, Yongqiang Lao, Junqing Gao, Junqing Gao