Pulmonary alveolar microlithiasis (PAM) in a child

Area of Science:

• Pediatric Pulmonology
• Rare Respiratory Diseases
• Medical Diagnostics

Background:

• Pulmonary alveolar microlithiasis (PAM) is an exceptionally rare lung disease characterized by the widespread deposition of calcium phosphate microliths within the alveoli.
• Diagnosis can be challenging due to its rarity and often non-specific initial symptoms.
• Consanguinity in parents may suggest a genetic predisposition to certain rare conditions.

Observation:

• A pediatric patient presented with persistent fever for 25 days, notably without cough or respiratory distress.
• Chest X-ray revealed bilateral diffuse nodulo-striate opacities, indicating widespread lung involvement.
• Extensive infectious workup, including tuberculosis testing, yielded negative results.

Findings:

• Histopathological examination of a thoracoscopic lung biopsy definitively identified alveolar microliths.
• The presence of alveolar microliths confirmed the diagnosis of pulmonary alveolar microlithiasis (PAM).
• The clinical presentation of isolated fever was atypical for pulmonary alveolar microlithiasis.

Implications:

• This case underscores the importance of considering rare pulmonary diseases like PAM in the differential diagnosis of pediatric fever of unknown origin.
• Atypical presentations of PAM necessitate a high index of suspicion and thorough diagnostic evaluation, including lung biopsy.
• Early and accurate diagnosis of PAM is crucial for appropriate management and understanding of its long-term prognosis in children.