CT showed hypointensity lesions in pontine area of 5 cases within which 4 cases accompanied by bilateral basal ganglion hypointensity lesions. Three cases were false negative on CT images.

• CT显示阳性5例,阴性3例,阳性病例中双侧基底节、桥脑出现斑片状低密度灶4例、桥脑低密度1例。