Nodular fasciitis is a benign, reactive, proliferative spindle-cell lesion, usually located at the subcutaneous tissues or muscle fascia. Clinically, it manifests as a soft -tissue mass with well-dened margins and xed to the adjacent structures. Because of its rapid growth rate, rich spindle cell cellularity and relatively high mitotic activity, nodular fasciitis is sometimes misdiagnosed as a spindle cell sarcoma. Accurate diagnosis is based only on histopathological examination. A rare case of nodular fasciitis of the buccal mucosa which was misdiagnosed as spindle cell sarcoma in a 58-year-old male patient is presented with further discussion of differential diagnosis of both tumors. ; 牙醫學系 ; 牙醫專業學院 ; 期刊論文