Figure 1.

Surgical treatment of traumatic pericallosal aneurysm. (A) An emergent head CT scan after a fall accident showed no hemorrhage or bone fracture; (B) One week later, a hematoma of more than 30 ml in the left corpus callosum was found in a cerebral CT scan; (C, D) A pericallosal aneurysm was confirmed by non-subtracted angiography (C) and three-dimensional angiography (D); (E) The post-operational CT showed that the hematoma was evacuated; (F) The distal anterior cerebral artery was shown in post-operational CT angiography; (G) No endothelial cell or vessel wall tissue was found in the resected sac by histology. (H) The patient achieved a satisfactory recovery at three-month follow up.