Odontogenic Myxoma — MFDS Part 1 MCQ
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Correct answer: C — A multilocular radiolucency divided by fine, straight septa into tennis-racket or honeycomb compartments
Explanation lettering: C = shown as A · A = shown as C
A is correct. A larger odontogenic myxoma typically appears as a multilocular radiolucency containing fine, straight residual bony septa. These septa divide the lesion into angular compartments, producing the classic tennis-racket or honeycomb appearance. Small myxomas can be unilocular, but option B specifically describes the typical pericoronal relationship of a dentigerous cyst. Multiple tooth-like structures suggest a compound odontome. A ground-glass lesion blending into adjacent bone is characteristic of fibrous dysplasia. A sunburst periosteal reaction is principally associated with an osteogenic malignancy such as osteosarcoma rather than the characteristic presentation of odontogenic myxoma.
Reference: Wang K, Guo W, You M, et al. Characteristic features of the odontogenic myxoma on cone beam computed tomography. Dentomaxillofacial Radiology. 2017;46(2):20160232. https://pubmed.ncbi.nlm.nih.gov/27936914/