Toyama H, Ichise M, Schacter B I, Kirsh J C
Department of Radiology, Mount Sinai Hospital, University of Toronto, Ontario, Canada.
Clin Nucl Med. 1992 Jun;17(6):473-6. doi: 10.1097/00003072-199206000-00009.
A SPECT brain perfusion scan was performed on a patient who had symptoms of dementia. The SPECT scan showed marked crescentic medial displacement of the left cerebral hemisphere ("reverse crescent pattern"), and mildly decreased cortical perfusion in the affected hemisphere. Crossed cerebellar diaschisis was not present. On x-ray CT, the underlying abnormality was found to be a unilateral chronic subdural hematoma causing a significant mass effect. A reverse crescent pattern without crossed cerebellar diaschisis on SPECT brain perfusion scan in patients with dementia may suggest the diagnosis of chronic subdural hematoma.
对一名有痴呆症状的患者进行了单光子发射计算机断层扫描（SPECT）脑灌注扫描。SPECT扫描显示左脑半球明显呈新月形向内侧移位（“反新月形模式”），且患侧半球皮质灌注轻度降低。未出现交叉性小脑失联络。在X线计算机断层扫描（CT）上，发现潜在异常为单侧慢性硬膜下血肿，产生显著的占位效应。痴呆患者SPECT脑灌注扫描出现无交叉性小脑失联络的反新月形模式可能提示慢性硬膜下血肿的诊断。
