The parapharyngeal schwannoma usually arises from schwann cells of the vagus nerve or the cervical sympathetic. A Horner's syndrome appearing prior to surgery is unusual. A preoperative Horner's syndorme may be taken as presumptive evidence of a schwannoma involving the cervical sympathetic chain in the case of a solitary encapsulated tumor. We experienced recently a case of parapharyngeal schwannoma with Horner's syndrome. This case was treated with finger dissection through transcervical approach.