Immediate postoperative CT scan. Postoperative changes following resection of pineal region cystic lesion are evident in conjunction with significant pneumocephalus. Intracranial air is seen diffusely in the subarachnoid and ventricular spaces (a). A significant amount of air is also noted in the interpeduncular and prepontine cisterns. The midsagittal reconstructed image highlights the interpeduncular air (arrow; (b)).
