Frontal sinus ivory osteoma

Case contributed by Rania Adel Anan
Diagnosis certain



Patient Data

Age: 25 years
Gender: Female

Paranasal sinuses


A well-circumscribed uniformly very dense mass is seen within the left frontal sinus with no evidence of sinus obstruction or erosion of the sinus bony walls, impressive of ivory osteoma. 

Right maxillary sinus retention cyst is also noted.

Case Discussion

Osteoma of the paranasal sinuses is a common benign tumor, usually found incidentally. Osteomas are frequently seen elsewhere in the head and neck, particularly the mandible and outer table of the skull vault. There is a particular frequency distribution within the paranasal sinuses:

  • frontal sinuses: 80%
  • ethmoid air cells: 15%
  • maxillary sinuses: 5%
  • sphenoid sinus: rare

 Three histological patterns of osteoma are known:

  • ivory osteoma: the most common 
  • mature osteoma (osteoma spongiosum)
  • mixed osteoma (a mixture of ivory and mature histology)

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