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Table 2: 
Tumor histopathologic grade and TNM stagea
Tumor CharacteristicsNo. of Patients (%)
Hyams grade
    I3 (12)
    II17 (65)
    III6 (23)
    IV0 (0)
Tumor stage
    Primary tumor
        T121 (49)
        T210 (23)
        T34 (9)
        T48 (19)
    Lymph nodes
        N038 (88)
        N11 (2)
        N2B1 (2)
        N2C3 (7)
    Distant metastasis
        M042 (98)
        M11 (2)
  • a Of the 26 patients with pathology-reported Hyams grade, 77% had low-grade ENB (grade I or II). Tumor was found to have spread beyond in the nasal cavity and paranasal sinuses in 51% of patients, most frequently invading the cribriform plate (23%). Five patients (11%) were found to have cervical metastasis at initial staging.