Oral cavity & oropharynx

Other nonneoplastic

Osseous choristoma

Topic Completed: 1 November 2013

Minor changes: 29 December 2020

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PubMed Search: Osseous choristoma oral cavity

Nat Pernick, M.D.
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Cite this page: Pernick N. Osseous choristoma. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/oralcavityosseouschoristoma.html. Accessed December 8th, 2021.
Definition / general
  • Choristoma is a proliferation of tissues foreign to the site at which it is located
  • Choristoma of mature bone (osseous choristoma) is rare in soft tissue of oral cavity
Clinical features
Radiology images

Case #142

Xray images

Case reports
  • 17 year old girl with bulging, rock hard tumor covered with mucosa on the floor of her mouth (Case #142)
Gross images

Case #142

Various images

Microscopic (histologic) description
  • Irregular mature bone trabeculae and fibrous connective tissue
  • No osteoblastic activity; no atypia
Microscopic (histologic) images

Case #142

Various images

Images hosted on other servers:

Base of tongue

Differential diagnosis
  • Dystrophic calcification: often found in old thrombi, hemartomas or keratin filled cysts but it does not resemble bone
  • Heterotopic ossification (myositis ossificans): typically occurs within muscle and has more osteoblastic activity
  • Ossifying fibroma: does affect the craniofacial skeleton but has a proliferation of round, polyhedral or spindly cells
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