[The use of ultrasonic tomography for assessing the spread of a primary tumor of the mucosa in the retromolar area and for choosing the surgical treatment method].

Ultrasonic examination was carried out in 31 patients with stage III-IV squamous-cell carcinoma of the retromolar mucosa. Dissemination of the tumor of the retromolar triangle into the stomach was detected in 14, into the adjacent anatomical structures in 6 patients. Combined operations with inclusion into the block of removed tissues of the involved structures were carried out due to the information obtained. The data of ultrasonic tomography were confirmed by morphologic examinations of removed preparations.