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Comparison of visualization of a CCP on MR imaging between inverted papilloma and various malignant sinonasal tumors
Tumor No. of Total Subjects No. of Subjects Showing CCP on MR Imaging
Diffuse Partial T2WI CE-T1WI
Inverted papilloma 30 26 4 28 30
    Without SCC 22 22 0 20 22
    With SCC 8 4 4 8 8
Malignant tumors 128 6 11 13 17
    SCC 49 2 6 6 8
    Lymphoma 39 0 0 0 0
    Adenoid cystic carcinoma 10 1 1 1 2
    Malignant melanoma 8 0 1 0 1
    Adenocarcinoma 5 1 0 1 1
    Rhabdomyosarcoma 4 0 0 0 0
    Esthesioneuroblastoma 3 0 2 2 2
    Plasmacytoma 3 0 0 0 0
    Primitive neuroectodermal tumor 2 1 0 1 1
    Ameloblastic carcinoma 1 0 0 0 0
    Chordoma 1 0 0 0 0
    Mucoepidermoid carcinoma 1 1 0 1 1
    Undifferentiated carcinoma 1 0 1 1 1
    Non-keratinizing carcinoma 1 0 0 0 0
Note:—CCP indicates convoluted cerebriform pattern; T2WI, T2-weighted image; CE-T1WI, contrast-enhanced T1-weighted image; SCC, squamous cell carcinoma.