[A case of pulmonary alveolar microlithiasis]

Area of Science:

• Pulmonology
• Radiology
• Pathology

Background:

• Pulmonary alveolar microlithiasis (PAM) is a rare lung disease characterized by the accumulation of microliths in the alveoli.
• Accurate diagnosis can be challenging, especially in cases with atypical presentations or long-standing disease.
• This case highlights the importance of considering PAM in patients with persistent respiratory symptoms and a history of misdiagnosis.

Observation:

• A 42-year-old male presented with a 30-year history of pulmonary alveolar microlithiasis, initially misdiagnosed as miliary tuberculosis during childhood.
• Diagnostic workup included chest CT, tomography, pulmonary function tests, radioisotope scans (99mTc and 67Ga), and bronchoscopy with bronchoalveolar lavage (BAL) and transbronchial lung biopsy (TBLB).
• Available chest X-ray films from 27 years prior aided in establishing the protracted nature of the disease.

Findings:

• The patient's pulmonary alveolar microlithiasis followed a 30-year protracted course, underscoring the chronicity of the condition.
• Diagnostic procedures confirmed the presence of microliths within the alveolar spaces.
• The case emphasizes the diagnostic challenges and the need for thorough investigation in long-standing respiratory conditions.

Implications:

• This report contributes to the literature on pulmonary alveolar microlithiasis, particularly concerning its long-term clinical course and diagnostic considerations.
• Accurate and timely diagnosis of PAM is crucial for appropriate patient management and prognosis.
• Further research into the pathogenesis and long-term outcomes of pulmonary alveolar microlithiasis is warranted.