3MADISON M J,REMLEY K B,LATCHAW R E,et al. Radiological diagnosis and staging of head and neck squamous cell carcinoma. Radio Clin North Am, 1994,32 ( 5 ) : 163 - 166.
4ZBARN P, BECKER M, LANE H. Pretheraputic staging of hypopharyngeal carcinoma: clinical finding, computed tomography, and mangnetic resonance imaging compared with histopathologic evaluation. Arch Otolaryngeal Head Neck Surg, 1997,123 (6) :908 -909.