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Cryptogenic organizing pneumonia mimicking a mass lesion: An unusual case

Cryptogenic organizing pneumonia (COP) is less common interstitial lung disease with varying clinical picture. It can be misdiagnosed as lung cancer as COP usually presents with malaise, fever, weight loss, and myalgia, which overlap with clinical features of lung cancer. Here, we present a rare case of a 68-year-old male smoker admitted with cough, hemoptysis, arthralgia, fever, and chest pain. On chest X-ray, unilateral homogenous opacity was seen. Blood culture and sputum for Ziehl–Neelsen stain were negative. High-resolution computed tomography chest revealed consolidation in middle and lower zone of the left lung with ground-glass opacity with centrilobular nodules. Bronchoalveolar lavage specimen was negative for bacteria, Mycobacterium tuberculosis, and atypical cells. Transbronchial lung biopsy showed evidence of OP. The patient responded well to steroids.