Pulmonary Calcification and Ossification: Pathogenesis, CT Appearance, and Specific Disorders

Area of Science:

• Radiology
• Pathology
• Pulmonary Medicine

Background:

• Pulmonary high attenuation on imaging can result from calcification or ossification.
• These phenomena have distinct origins, microscopic features, and appearances on imaging.
• Differentiating between calcification and ossification is crucial for clinical diagnosis.

Purpose of the Study:

• To elucidate the distinct pathogeneses, histologies, and radiologic appearances of pulmonary calcification and ossification.
• To differentiate between metastatic pulmonary calcification (MPC) and dystrophic pulmonary calcification (DPC).
• To categorize patterns of pulmonary ossification, including nodular (NPO) and dendriform (DPO).

Main Methods:

• Review of radiologic findings associated with pulmonary calcification and ossification.
• Correlation of imaging features with underlying etiologies such as systemic hypercalcemia, local lung injury, and chronic lung disease.
• Classification of ossification patterns based on morphology and distribution.

Main Results:

• Metastatic pulmonary calcification (MPC) typically presents as diffuse nodules associated with systemic hypercalcemia.
• Dystrophic pulmonary calcification (DPC) appears nodular and is localized to areas of lung injury.
• Pulmonary ossification, including nodular (NPO) and dendriform (DPO) patterns, is linked to chronic lung disease and fibroblast-to-osteoblast transformation.

Conclusions:

• Pulmonary calcification and ossification represent different pathological processes with characteristic radiologic manifestations.
• Recognition of these patterns aids in identifying underlying conditions, from metabolic abnormalities to chronic lung diseases.
• Accurate interpretation of pulmonary calcification and ossification provides valuable insights into patient disease processes.