From Big Medical Encyclopedia

OSTEOMA (osteoma; Greek osteon a bone + - oma) — high-quality opukholepodobny bone education.

The lake is localized by hl. obr. in subordinate clauses (okolonosovy, T.) bosoms, especially in frontal, is more rare in bones of a skullcap and in a mandible.

In some cases multiple O. of a mandible, a skullcap and long tubular bones are combined with a diffusion polipoz went. - kish. a path and benign tumors of skin and other soft tissues that makes Gardner's syndrome (see. Gardner syndrome ). Macroscopically O. can be periosteal, cortical or endosteal. Islands of adnexal bosoms are multiple and are located in a cavity of sine.

Fig. 1. Microdrug of a compact osteoma: narrow vascular channels (1) in the bone mass (2) of a fibrous and lamellar structure; coloring hematoxylin-eosine; X 64.

The lake of bones of a skull has an appearance of diffusion consolidation or accurately limited center. Microscopically distinguish O. compact, spongy and osteoid osteoma (see). Compact O. has no bone beams and is formed by almost continuous bone mass of a fibrous or lamellar structure with very narrow vascular channels (fig. 1). Spongy O. consists of randomly located bone beams, interframe spaces in it are filled with cellular and fibrous fabric. Most of researchers consider compact O. as manifestation of disturbance of fabric development or as bone to gamarty (see); the spongy osteoma is carried to tumors or to a fibrous dysplasia.

A wedge, the course of a disease can be long time asymptomatic, and sometimes O. find accidentally at rentgenol, a research. Klien, symptomatology at O.'s localization in adnexal bosoms is usually connected with disturbance of outflow of a secret or emergence of symptoms from an eye-socket at destruction of its walls.

At localization of an osteoma on a base of skull can arise focal nevrol, symptoms, to come an arrosion of sine of a firm meninx or intracranial vessels.

Fig. 2. The direct tomogram of a skull at an osteoma: in the left sinus of Highmore the roundish shadow of a compact osteoma is visible (it is specified by an arrow).

Rentgenol, a research allows not only to find O., but also to define its form, structure, situation, the sizes and relationship with the next bodies. Compact O. on the roentgenogram has the form of a rounded oval intensive unstructured shadow (fig. 2). Spongy

Fig. 3. The roentgenogram of the right shoulder joint, a part of a thorax and humeral bone with a spongy osteoma (it is specified by an arrow).

The lake is located on more or less wide basis, has accurate, equal contours (fig. 3). Disturbance of an integrity of a cortical layer of a bone at O. is not observed.

Differential diagnosis carry out hl. obr. with multiple exostoses (see) and ossifying miositis (see).

Treatment asymptomatic O., if it does not increase in sizes, as a rule, is not required. At emergence a wedge. symptoms operational removal of the Lake is carried out.

Forecast favorable, a recurrence after operation usually does not come.

Bibliography: Vinogradova T. P. Tumors of bones, page 122, M., 1973; Reynberg S.A. Radiodiagnosis of diseases of bones and joints, book 2, page 391, M., 1964; The Guide to pathoanatomical diagnosis of tumors of the person, under the editorship of N. A. Krayevsky and A. V. Smol-yannikova, page 381, M., 1976; F and and and r J I am V. A N. Radiodiagnosis, page 583, Yerevan, 1977; Lichtenstein L. Bone tumors, p. 79 and. lake, St Louis, 1977; Sp jut H. J. a. o. Tumors of bone and cartilage, Washington, 1970.

BB. H. Nightingales; V. V. Kitayev (rents.).