Assessment of laryngeal cancer: CT scan versus endoscopy.

In order to assess the value of the systematic use of CT scan in the workup for laryngeal cancer, a retrospective study was conducted on 66 consecutive previously untreated cases of laryngeal cancer. Endoscopic and CT scan findings were systematically compared. The areas of particular difficulty in CT scan assessment are described. CT scan alone understaged laryngeal cancers in 10.6% of cases, all of them being superficial spreading tumors within the larynx or in the juxtalaryngeal areas. CT scan worsened the staging in 22.7% of cases, all of them being deep invasions overlooked by endoscopy. CT was most useful in lesions initially classified as T2 and T3, which included all those reclassified by CT. None of the T1 lesions was upgraded after CT, and systematic use of CT for this stage is not warranted. CT scan workup changed the therapeutic attitude in 10 of the 66 patients (15.1%), causing a switch to conservative surgery in seven patients and total laryngectomy with radiotherapy for the three others. CT was also valuable in choosing the most suitable technique for conservation surgery.