Eighty-four histologically proven cases of carcinoma of the orpharynx and oral cavity were analyzed with CT findings. RESULTS : 1. CT has great advantages in the evaluation of deep infiltration and cervical lymph node metastasis. 2. Cervical lymph node metastasis were found in 52 cases of all and primary draining lymph nodes were jugulodigastric and submandibular. 3. Local extension of tumor was observed in 49 cases and tongue base cancer had greatest tendency to infiltrate deeply.