STAT6 and meningioma: In contrast, immunohistochemical findings are helpful in the differential diagnosis of this disease and other tumors such as meningioma; we synthesized the immunohistochemical findings of previous literature on HPCs/SFTs of the cranial base and combined them with our cases and found that the immunohistochemical findings of HPCs/SFTs are usually CD34 (n = 35/45, 77.8%), Vimentin (n = 10/11,90.9%), Bal-2 ( n = 8/9,88.9%), STAT6 (n = 28/29,96.6%), and Ki67 index ranging from 8 to 40%.