The field of view and working space in the parapharyngeal space are limited for surgical manipulation. However, many important blood vessels and nerves run through this area, and surgery should be performed under clear vision to ensure safety. In the past, inter-capsular resection of schwannomas in the parapharyngeal space was performed blindly and manually because it was difficult to dissect the head side of the tumor under clear vision. To resolve this problem, we devised a continuous aspiration syringe method and examined the status of traction and aspiration, presence/absence of capsular damage due to aspiration and traction, and the possibility of detaching the tumor to the head side under clear vision using this method in four cases. The nerve of origin was the sympathetic chain in 3 cases and the vagus nerve in 1 case, the operating time was 171–265 minutes, and the volume of blood loss was 23–44 ml. The results suggest that the continuous aspiration syringe method may be useful for the resection of schwannomas arising in the parapharyngeal space, as it allows dissection of the undissected portion of the tumor under clear vision by traction through the parapharyngeal space while continuously aspirating the tumor in the tumor capsule.
