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Deposition of calcium salts in the skin, subcutaneous tissue, or other part of the body in certain pathologic conditions.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



calcification, the deposit of calcium salts in tissues and organs that do not normally contain them in undissolved form.

In old persons, lime is deposited in the cartilage of the ribs and larynx. A normal phenomenon is the grains of lime found in the pineal gland and the vascular plexus of the brain (brain sand). Under pathological conditions, calcium salts are deposited both inside and outside the cells. Sometimes these salts take the form of grains or granules, and sometimes they form larger clumps. The process is called petrifaction, and the calcified area is called the petrifact. Calcium salts fall out of solution and are deposited in tissues because of the unstable state of protein colloids, changes in the pH toward greater alkalinity, and increases in calcium concentration in the blood. Several forms of calcinosis are distinguished, according to the mechanism of development.

Dystrophic calcification is a localized process in tissue areas with sharply lowered metabolism, as a result of which oxidative processes are decreased, the tissue becomes more alkaline, and lime falls out of solution. Dystrophic calcification occurs in dystrophic processes (dystrophy) and tissue necrosis.

Calcareous metastases are a manifestation of a general disruption of calcium metabolism in which the calcium concentration in the blood is elevated. Osteomyelitis, myeloma, and other diseases induce processes that destroy bone tissue and release lime from it.

The causes of calcium accumulation in the blood include diseases of the large intestine and kidneys and hypovitaminosis D. In contrast to dystrophic calcification, the sedimentation of lime in healthy, unchanged tissues and organs occurs only in those tissues that normally have an alkaline medium (lungs, stomach, kidneys, and arteries).

Interstitial calcinosis (calcium gout) is distinguished by the fact that there is no depletion of calcium in the bones and no excess concentration of calcium in the blood. The depositing of lime occurs in the skin and subcutaneous tissues or may spread to the muscles and other tissues. The cause of interstitial calcinosis has not yet been clearly shown. It is detected chiefly during X-ray examination. Treatment is both symptomatic and directed toward removing the primary causes of the condition.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
She was referred to us upon recurrence of bilateral calcinosis in her elbows and in her right upper thigh.
Intravenous sodium thiosulfate for treating tumoral calcinosis associated with systemic disorders: report of four cases.
Calcinosis cutis most commonly found in fingers and is more common in female than in males.
Strio-pallido-dentate calcinosis: A diagnostic approach in adult patients.
Spontaneous regression of multiple tumoral calcinosis in a child.
Systemic symptoms and signs evocative for SSc, such as presence of RP or acrocyanosis, telangiectasias or calcinosis, visceral involvement such as interstitial lung disease, or esophagus dyskinesia were always reported.
Furthermore, we highlight hypocalcemia as a cause for seizures and discuss the occurrence of brain calcinosis in IH and the role of brain calcinosis versus hypocalcemia as the aetiology of seizures in these patients.
ABI determinations <0.9 and [greater than or equal to] 1.4 were considered abnormal, the former reflecting PAD and the latter calcinosis.
The radiological appearances are usually nonspecific, and differential diagnoses include calcifying schwannoma, chondroma, myositis ossificans, tumoral calcinosis, chondrosarcoma, and synovial sarcoma [13].
Secondly, despite the stringent inclusion criteria, diabetic foot ulcers were heterogeneous in nature at least partly due to the high prevalence on medical calcinosis in diabetic vessels.
We assumed that the mechanism of the present symptom was due to HO or calcinosis in the peroneal tendon sheath.
According to guidelines and experts' opinions, our surgical indications were as follows: severe renal HPT refractory to medical treatment (e.g., iPTH > 800 pg/ml, hypercalcemia, and hyperphosphatemia), uncontrollable renal secondary hyperparathyroidism on cinacalcet, intolerance to medical therapy due to adverse effects, expected long-term survival with severe symptomatic renal HPT including pruritus, intractable bone pain, advanced osteopaenia/osteoporosis, calcinosis and calciphylaxis, severe osteitis fibrosa or high bone turnover, erythropoietin-resistant anemia, and dilated cardiomyopathy [3, 6-8,10].