Non-neoplastic lesions that resemble neoplasms have been called pseudoneoplasms (Harshbarger, 1984). These are typically hyperplastic or chronically inflamed lesions and can be caused by a variety of stimuli. Often the resemblance between neoplasms and pseudoneoplasms is superficial, and they can be easily distinguished by histopathology. In some cases, however, there is a lack of consensus about the neoplastic nature of lesions, perhaps because of the subjective nature of histologic criteria.

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