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2. Dendriform pulmonary ossification (DPO)
Based on the clinical presentation, the patient was diagnosed with dendriform pulmonary ossification (DPO). DPO is a result of progressive metaplastic ossification within the lungs (3,4). Typical CT findings include branching nodules which are bone density and usually more prominent in the lower lobes. The branching pattern distinguishes DPO from other causes of lung ossification such as pulmonary alveolar microlithiasis. DPO may occur in association with various lung disorders including IPF, post-ARDS, chronic aspiration and in several pneumoconiosis including asbestosis and heavy metal exposures. Areas of micronodular calcification may also occur in sarcoidosis. DPO can also be idiopathic.
What is the treatment of DPO? (Click on the correct answer to be directed to the seventh and final page)