Hypersensitivity pneumonitis - acute
Recent onset of dyspnea and chest tightness.
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Numerous poorly defined small (less than 5 mm) alveolar opacities, and multiple centrilobular ground-glass nodules scattered throughout both lungs associated with bilateral basal ground glass opacities.
The patient reports a recent exposure to pigeons and the CT chest demonstrates the typical appearance of acute hypersensitivity pneumonitis.