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A 70-year-old man who smoked was referred to our hospital because of progressive cough and dyspnea. Radiologic images showed ground-glass attenuation predominantly in the lower lung lobes. A surgical lung biopsy was performed, and a diagnosis of desquamative interstitial pneumonia (DIP) was made. The patient's symptoms improved with smoking cessation and steroid treatment, but the ground-glass attenuation did not completely resolve. At 10 years after the diagnosis, the fibrotic lesions deteriorated and treatment with nintedanib was subsequently initiated. Careful observation is needed in patients with DIP whose lung involvement does not completely improve with initial treatment.

The frequency of pericarditis as a complication in COVID‐19 patients without underlying disease is not well known. We report a case of COVID‐19 presenting with pericarditis without myocarditis or severe respiratory symptoms in a middle‐aged woman, who had neither underlying disease nor previous diagnosis of COVID‐19.

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