Dystrophic calcification

Dystrophic calcification is a form of calcification that occurs in damaged or necrotic tissue, despite normal serum calcium levels. This is in contrast to metastatic calcification, which occurs due to elevated serum calcium levels.

Pathogenesis

Dystrophic calcification is initiated by cell death, which leads to the release of intracellular calcium and phosphate ions. These ions combine to form hydroxyapatite crystals, which are deposited in the damaged tissue. The process is facilitated by the acidic environment created by cell death and inflammation.

Clinical significance

Dystrophic calcification can occur in a variety of tissues and organs, including the heart, lungs, kidneys, and blood vessels. It is often associated with chronic diseases such as atherosclerosis, rheumatoid arthritis, and tuberculosis. In the heart, it can lead to valvular heart disease and conduction system abnormalities. In the lungs, it can cause pulmonary fibrosis and respiratory failure. In the kidneys, it can result in renal failure.

Diagnosis

Diagnosis of dystrophic calcification is typically made through imaging studies such as X-ray, computed tomography (CT), and magnetic resonance imaging (MRI). These studies can reveal the presence and extent of calcification. Histological examination of tissue samples can also be used to confirm the diagnosis and determine the underlying cause.

Treatment

Treatment of dystrophic calcification is primarily aimed at managing the underlying condition causing the tissue damage. This may involve medication, surgery, or other interventions. In some cases, the calcified tissue may need to be surgically removed.

See also

• Metastatic calcification
• Calciphylaxis
• Calcification
• Calcium metabolism