Fig. 1

Cranial CT and CTA images. a, b Cranial CT showed space-occupying lesions in the sellar region and local bone destruction. At higher levels, the tumor image could be observed, and the boundary was clear. There appeared to be a capsule, the size of which was approximately 3 cm × 4 cm. The density inside and surrounding the tumor increased, patchy hemorrhage was observed, and a cord-like high-density image was observed in the bilateral sylvian cisterns. The findings were considered to be consistent with subarachnoid hemorrhage. c, d Cranial CTA revealed a cystic-like protuberance, identified as an aneurysm, in the anterior communicating artery. The neck of the aneurysm shifted toward the A1 segment of the left anterior cerebral artery. The left anterior cerebral artery was thicker. The Willis Circle was compressed and pushed to the lateral side