<unk> s are definitively diagnosed by histologic examination. However, magnetic resonanace imaging (MRI) may show a characteristic feature described as a convoluted cerebriform pattern (CCP). A retrospective study published in the American Journal of Neuroradiology concluded that identification of CCP by MRI in a patient with a nasal tumor made the diagnosis of<unk>  quite likely. The study reported the sensitivity and specificity to be 100% and 87% respectively. CCP can be associated with other malignant tumors as well.
Inverted papilloma
Ductal carcinoma in situ
Squamous cell papilloma
Intraductal papilloma
Juvenile polyp
Phyllodes tumor
Lentigo maligna
Basal cell adenoma