Bronchopulmonary oxalosis revealing pulmonary aspergillosis in an immunocompetent patient: a case report.

Bronchopulmonary oxalosis refers to localized calcium oxalate crystal deposition in pulmonary tissue associated with aspergillosis. Several Aspergillus species produce oxalic acid that precipitates with tissue calcium, and resulting crystals can cause local tissue injury. We report a 19-year-old Moroccan female without known immunodeficiency or underlying lung disease who presented with a thin-walled cystic pulmonary lesion with air-fluid level, initially suspected to represent a hydatid cyst. Following surgical resection, histopathology revealed abundant calcium oxalate crystals, supporting the diagnosis of pulmonary aspergillosis with prominent bronchopulmonary oxalosis. Clinicians should consider aspergillosis when evaluating unexplained cystic lesions with identified calcium oxalate crystals.