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Most common tumor of the paranasal sinuses
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Most frequently seen in the frontal and ethmoid sinuses
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Benign tumor of membranous bone consisting of dense, compact bone
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Majority of paranasal osteomas are discovered serendipitously
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In the skull, they usually arise from the outer table
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Rarely, large osteoma in the frontal or ethmoid region may displace globe forward and cause proptosis
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Obstruction of a sinus ostium may lead to infection or formation of a mucocele
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Very rarely, an osteoma may erode through the dura leading to cerebrospinal fluid rhinorrhea or intracranial infection
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Imaging findings
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Well-circumscribed, sharply-marginated round and very dense lesions usually less than 2 cm in size
Osteoma, frontal sinus. Red arrows point to round density in the right frontal sinus
with the characteristic appearance of an osteoma.
For a larger photo of the same image without arrows, click here
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Multiple paranasal osteomas are found in Gardner’s syndrome
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Multiple osteoma of the mandible and maxilla, along with the frontal, sphenoid and ethmoid sinuses, rarely the long bones or phalanges
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Cutaneous and soft tissue tumors
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Association between colonic polyps with a predilection to malignant degeneration
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