Suprasellar arachnoid cyst treatment includes endoscopic ventricle-cystostomy (VC) and ventriculo-cysto-cisternostomy (VCC). Endoscopic VCC was performed on a 15-month-old boy with suprasellar and bilateral middle cranial fossa arachnoid cysts. Several perforating branches were seen from the posterior traffic artery in the septum between the cysts, which could be damaged if the window was opened. Additionally, a small hole was found in the septum between the cysts on the left side, and communication between the cysts was considered. Hence, the septum was not opened. Postoperative MRI showed the decreased size of both suprasellar arachnoid and the bilateral middle cranial fossa arachnoid cysts. In cases where other arachnoid cysts are in contact with the suprasellar arachnoid cyst, VCC alone may be effective because of the communication between the cysts, as in this case.