Cerebral hyperperfusion syndrome after superficial temporal artery-middle cerebral artery bypass for severe intracranial steno-occlusive disease: a case control study. Categories: Extracranial to Intracranial Bypass (EC-IC Bypass) Author: Chan BP, Chong VF, Choy DK, Lwin S, Ning C, Seet RC, Sharma AK, Sharma VK, Shen L, Teo K, Teoh HL, Yeo TT