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A Woman in Her Late 40s with Hypersensitivity Pneumonitis and Recurrent Pleural Effusions. CASE PRESENTATION: A woman in her late 40s with a history of recurrent deep vein thromboses and hypersensitivity pneumonitis (HP) presented to the ED with progressive exertional dyspnea and productive cough. She recently had started oral corticosteroids after HP was confirmed via transbronchial lung cryobiopsy from both the right upper and lower lobes, which showed poorly formed granulomas with mild interstitial and perivascular lymphocytic infiltrates. A causative antigen for her HP was never clearly identified.