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WHO Classification of Tumours
Osteoid osteoma, NOS
Nasal cavity and Sinuses


Definition

A small benign bone-forming neoplasm characterized by the presence of differentiated osteoblasts. The tumor is usually surrounded by hypervascular sclerotic bone and has limited growth potential. Clinical signs and symptoms include pain and localized tenderness, at the site of the lesion. The pain may be intense, but in the majority of cases it is completely alleviated by aspirin. Prognosis is excellent and recurrences are rare.