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(os-te-o'ma) (mat-a) plural.osteomataplural.osteomas [ osteo- + -oma]
A bonelike structure that develops on a bone or at other sites; a benign bony tumor. Synonym: exostosis

cancellous osteoma

A soft, spongy tumor. It has thin, delicate trabeculae that enclose large medullary spaces like those in cancellous bone.

cavalryman's osteoma

An osteoma of the femur at the insertion of the adductor femoris longus.

choroidal osteoma

A rare, benign tumor of the eye, composed of calcified bone. On examination of the retina, it appears as an orange-yellow lesion usually located near the optic disc, often bilaterally. It is most often identified in young women. The tumor frequently compromises visual acuity. It can be treated with laser photocoagulation.

osteoma cutis

A benign formation of bone nodules in the skin.

dental osteoma

A bony outgrowth of the root of a tooth.

osteoma durum

A very hard osteoma in which the bone is ivory-like.

osteoma medullare

A bony tumor containing medullary spaces.

osteoid osteoma

A rare benign bone tumor composed of sheets of osteoid tissue that is partially calcified and ossified. The condition occurs esp. in the bones of the extremities of the young.

osteoma spongiosum

A spongy tumor in the bone. Synonym: osteospongioma
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Radiologic diagnosis of osteoid osteoma: From simple to challenging indings.
Osteomas are described as bony growths, initially formed of cancellous bone that may become increasingly compact with time.
Reactive sclerosis is variable, and some tumors might show features of a central sclerotic nidus similar to a osteoid osteoma. Some tumors are highly vascular and may have cystic hemorrhagic areas.
Table 1: Comparative analysis of features of mandible peripheral osteomas from some published studies Bulut et Goudar et Kaya et Donohue- Criteria al (7) al (8) al (9) Cornejo et al (10) Age (yrs) 37 29 55 17 Sex F M F F Present 6 12 ?
Forty-five patients underwent surgical excisions for symptomatic sino-orbital osteomas during the study period yielding an average of 2 cases per year.
In this case report, we describe our procedure for performing RFA of a metacarpal osteoid osteoma without damage to adjacent tissues.
However, exostoses, which occur only in the external auditory canal, are non-tumoral multiple, bilateral, broad-based elevations of the tympanic bone in response to repeated exposure to cold water, whereas osteomas [8] are solitary, unilateral, pedunculated tumors of unknown origin that may invade the middle ear.
Computed tomography (CT) of the paranasal sinuses revealed an extensive osteoma of the left ethmoid sinus and left nasal passage (figure, B).
Hard, nodular, or pedunculated masses, such as peripheral osteomas, torus, and exostosis, are radiographically seen as a dense, uniform radiopaque mass extending outward from the cortex.
Osteoid osteomas have typical painful symptoms resolved with NSAIDS and are benign and easily treatable.
Osteomas of the paranasal sinuses are benign lesions of osseous origin, often incidentally found by computed tomography (CT) scanning.