====== Osteoma ======

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Osteomas are the most common primary [[bone tumor]] of the [[calvaria]]. They are benign, slow-growing [[lesion]]s, that occur commonly in the [[cranial vault]], [[mastoid]] and paranasal [[air sinus]]es, and the [[mandible]]. Lesions within air sinuses may present as recurrent [[sinusitis]]. More common in [[female]]s, the highest [[incidence]] is in the 6th decade. 
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Triad of [[Gardner's syndrome]]: multiple cranial osteomas (of the calvaria, sinuses, and mandible), colonic polyposis, and soft-tissue tumors.
 

Typically, it shows a very hyperdense osseous lesion on [[computed tomography]] (CT) scan and low-intensity change on [[T2]]-weighted image on [[magnetic resonance imaging]] (MRI). 

see [[Osteoid osteoma]].

see [[Intracranial osteoma]].

[[Paranasal sinus osteoma]] ([[Frontal sinus osteoma]])

===== Pathology =====

Consists of osteoid tissue within osteoblastic tissue, surrounded by reactive bone. Difficult to distinguish from [[fibrous dysplasia]].

===== Differential diagnosis =====

Localized increased density or hyperostosis of the calvaria.