A 47-Year-Old Woman With Progressive Exertional Dyspnea and Fatigue.

CASE PRESENTATION: A previously healthy 47-year-old nonsmoking woman was admitted to our hospital with an 8-month history of progressive exertional dyspnea and fatigue. Chest high-resolution CT (HRCT) on admission showed diffuse, bilateral, patchy ground-glass opacity (GGO) (Fig 1A). She was diagnosed with interstitial lung disease, and corticosteroid therapy with 8 weeks prednisone taper was completed, with initial good response. Eight months later, she was readmitted because of worsening of the dyspnea, with no fever, wheeze, dry cough, chest pain, weight loss, or hemoptysis. She denied a history of hair loss, skin rash, oral ulcers, or arthralgia. She denied a history of allergy or taking other drugs. She had no occupational or environmental exposures. There was no family history of respiratory diseases or hematologic diseases.