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There are 3 variants of adenomatoid odontogenic tumour (6-8) the follicular type (accounting for 73% of cases), which has a central lesion associated with an embedded tooth; the extrafollicular type (24% of case), which has a central lesion and no connection with the tooth; and the peripheral variety (3% of cases).
However, even though bronchoscopy was selected first most frequently, it was selected as the first diagnostic test by a majority of the physician respondents as a group (>50%) for only 1 of the simulations (simulation 12: central lesion, >5 cm, pretest probability of malignancy 10%).
Although these further tests clearly indicated the presence of a central lesion, the physician's diagnostic strategy should not necessarily require such a weight of evidence before the physician pursues a definitive investigation with magnetic resonance imaging.
Studies should not rely on central lesion location or [FEV.
34-36) Bronchoscopy is a technique ideally suited to large, central lesions, with yield dropping to 30% to 40% in SPNs without an endobronchial component.
Osteomas can develop as peripheral (periosteal) masses attached to the cortical plates or as central lesions arising from endosteal bone surfaces whereas the extraosseous form develops in muscular tissue structures.
However when the ameloblastoma shows a typical expansile multilocular aspect, the differential diagnosis can include a variety of odontogenic or non-odontogenic lesions with similar characteristics like odontogenic keratocysts, aneurysmal bone cysts, adenomatoid odontogenic tumors, odontogenic myxomas, and giant cell central lesions.

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