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[Sonography in tumor after-care of head-neck tumor patients. Value of sonomorphologic criteria and sonographic M/Q quotients].

The ranking of postoperative sonography is examined in respect of imaging of neck lymph node enlargement and neck lymph node metastases or lymphomas, using a prospective study involving 119 patients whose head and neck tumours had already undergone treatment. These patients had been subjected to tumour aftercare for an average period of 26 months. The resulting quotient values (M/Q-Quotient) and the transverse and long axis lengths, respectively, were used as diagnostic criteria for suspicion of malignancy. A cervical lymph node with an M/Q-Quotient greater than two ruled out a metastasis with 94% accuracy. A quotient of less than two confirmed the presence of a metastasis with 92% accuracy. In comparison, evaluation using the transverse axis method ruled out metastasis in 92% of the cases, with a sensitivity of only 83%. The presence of sonomorphological criteria as a highly medullary reflex at the centre of the lymph node or excentric widening of cortex improves diagnostic safety.