Nasal cavity, paranasal sinuses, nasopharynx
Benign / nonneoplastic lesions: bone
Fibroosseous lesions

Topic Completed: 1 November 2004

Minor changes: 2 March 2020

Copyright: 2004-2020,, Inc.

PubMed Search: Fibro osseous lesions nasal

Nat Pernick, M.D.
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Table of Contents
Definition / general
Cite this page: Pernick N. Fibroosseous lesions. website. Accessed May 28th, 2020.
Definition / general
  • Fibrous dysplasia, ossifying fibroma, cementoossifying fibroma (also called psammomatoid ossifying fibroma in extragnathic facial bones)
  • Above disorders represent parts of microscopic spectrum
  • Fibrous dysplasia: irregular shapes ("Chinese letters") of woven bone without osteoblastic rimming; Xray usually shows ill defined borders and ground glass or orange peel quality; 20% recur
  • Ossifying fibroma: trabeculae of lamellar bone with prominent osteoblastic rimming; Xray usually shows well circumscribed margins and punched out appearance; rarely recurs
  • Cementoossifying fibroma: sharply defined, irregular, calcified spherules in densely fibrotic stroma with nonlinear bony trabeculae
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