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Pulmonary alveolar microlithiasis--report of three cases with pulmonary function and exercise studies
S K Sharma1, S Sharma, S Mukhopadhyaya
1Department of Medicine, All India Institute of Medical Sciences, New Delhi.
The Indian Journal of Chest Diseases & Allied Sciences
|October 1, 1992
Summary
Pulmonary alveolar microlithiasis, a rare lung disease, involves calcific concretions in alveoli. This report details three unusual cases, highlighting varied clinical and radiologic findings.
Area of Science:
- Pulmonology
- Rare Diseases
- Radiology
Background:
- Pulmonary alveolar microlithiasis (PAM) is an exceptionally rare condition characterized by the accumulation of tiny calcium phosphate stones within the lung's alveoli.
- The pathogenesis of PAM remains poorly understood, contributing to diagnostic challenges and limited treatment options.
Observation:
- This report presents three distinct cases of pulmonary alveolar microlithiasis, emphasizing their diverse and atypical clinical presentations.
- Radiological imaging revealed diffuse calcific densities throughout the lungs, often accompanied by emphysematous changes.
- Bone scintigraphy demonstrated widespread tracer uptake in the lungs, indicating the presence of calcifications.
Findings:
- Pulmonary function tests in one patient indicated hyperinflation, small airways dysfunction, and a restrictive ventilatory defect.
- Exercise testing revealed significant arterial oxygen desaturation during physical activity, suggesting impaired gas exchange.
Implications:
- These cases underscore the importance of considering pulmonary alveolar microlithiasis in patients with unexplained diffuse lung calcifications and respiratory symptoms.
- The varied findings highlight the need for comprehensive diagnostic approaches, including advanced imaging and pulmonary function assessments.
- Further research into the underlying mechanisms of PAM is crucial for developing targeted therapies and improving patient outcomes.
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