Endoscopic evaluation of a sinonasal tract mass is not completely reliable neither in defining local extension nor in suggesting the histology. At endoscopy, in fact, only the portion of the lesion occupying the nasal fossa may be examined (Fig. 9.1). Moreover, the appearance of a malignant tumor, which usually consists of a polypoid, fleshy mass, with irregular surface, possible ulcers and superficial hemorrhages, is quite nonspecific. A submucosal pattern of growth can be observed in some non-epithelial tumors, like chondrosarcoma or lymphomas. However, other lesions, such as osteomas, fibrous dysplasia, and pneu-mosinus dilatans may show a similar endoscopic appearance.
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