两例蛛网膜下腔出血患者的CT脑扫描都发现在胼胝体区出现环形密度增强团块,提示为脑肿瘤。然而经脑血管造影和手术证实是由于胼周动脉动脉瘤破裂形成血肿,以后血肿包膜机化,密度增高,形成假性脑瘤征象。病例报告如下:例1,45岁,女性。病史为头痛,颈强直两天。由腰穿证实为蛛网膜下腔出血。最初曾在他院行脑血管造影,无异常发现。患者病情稳定。两周后行CT扫描检查,显示在胼胝体体部和膝部有轻度密度增高团块影象,并伴有额角向外 CT brain scans of two patients with subarachnoid hemorrhage all showed a circular density-enhancing mass in the corpus callosum, suggesting a brain tumor. However, cerebral angiography and surgery proved to be due to the formation of hematoma due to the rupture of the periorbital arterial aneurysm. After the hematoma was encapsulated, the density increased and the signs of pseudo-brain tumors formed. Case reports are as follows: Case 1, 45 years old, female. His medical history was headache, and his neck was stiff for two days. Confirmed by lumbar puncture is subarachnoid hemorrhage. He had initially performed cerebral angiography at his institution and found no abnormalities. The patient is in stable condition. CT scans were performed two weeks later and showed a slight density increase in the corpus callosum and knees with anteroposterior angles.