Pulmonary alveolar microlithiasis

Area of Science:

• Pulmonology
• Rare Diseases
• Medical Diagnosis

Background:

• Pulmonary alveolar microlithiasis (PAM) is a rare lung disorder of unknown cause.
• Characterized by intra-alveolar deposition of calcium phosphate microliths.
• Approximately 400 cases reported globally, affecting individuals from newborns to 80 years.

Purpose of the Study:

• To summarize the key features, diagnosis, and management of Pulmonary Alveolar Microlithiasis.
• To highlight the diagnostic modalities and current therapeutic limitations.

Main Methods:

• Literature review of reported cases of Pulmonary Alveolar Microlithiasis.
• Analysis of patient demographics, clinical presentation, diagnostic findings, and treatment outcomes.

Main Results:

• PAM typically presents with a slow progression and a restrictive pattern on pulmonary function tests.
• Diagnosis is aided by imaging (chest X-ray, HRCT, Tc-99m lung scan) and confirmed by bronchoalveolar lavage or biopsy.
• No specific therapy exists; lung transplantation is considered for end-stage disease with respiratory insufficiency and cor pulmonale.

Conclusions:

• Pulmonary Alveolar Microlithiasis is a rare, slowly progressing lung disease with no established cure.
• Early diagnosis through imaging and biopsy is crucial.
• Management focuses on supportive care and considering lung transplantation for advanced cases.