Curshmann’s crystals are seen in ?
**Core Concept**
Curshmann's crystals are a type of inorganic crystal found in the sputum of patients with certain respiratory conditions. They are composed of calcium and phosphate salts and are formed through the interaction of respiratory secretions with the airway environment.
**Why the Correct Answer is Right**
Curshmann's crystals are typically seen in patients with chronic respiratory diseases, particularly those with cystic fibrosis or bronchiectasis. The formation of these crystals is thought to occur through the concentration of calcium and phosphate ions in the respiratory secretions, which then precipitate out as crystals. This process is often associated with the presence of neutrophils and other inflammatory cells in the airways.
**Why Each Wrong Option is Incorrect**
**Option A:** While other types of crystals, such as pseudoglandular crystals, may be seen in respiratory conditions, Curshmann's crystals are specifically associated with chronic respiratory diseases and are not typically seen in other conditions.
**Option B:** Sputum plugs are a feature of cystic fibrosis, but they are not composed of Curshmann's crystals.
**Option C:** While calcium salts are a component of Curshmann's crystals, they are not typically seen in the context of hypercalcemia or other metabolic disorders.
**Clinical Pearl / High-Yield Fact**
Remember that Curshmann's crystals are a key feature of chronic respiratory diseases, particularly cystic fibrosis and bronchiectasis. Their presence in sputum can provide important diagnostic clues for these conditions.
**Correct Answer: C.