Organizing Pneumonia with Solitary Focal Nodule and Subsequent Multiple Pulmonary Shadows

A 66-year-old woman was referred to us for evaluation of an asymptomatic nodule in the lung that had been detected through computed tomography (CT) examination during routine unit physical examination. A solitary focal nodule with halo sign (blue arrow) was demonstrated in the right upper lobe, 1.4 cm in diameter (Fig. 1A). Repeat CT 1 month later (Fig. 1B-D) showed subsequent multiple pulmonary shadows (red arrows). The patient had been diagnosed with depression 3 years ago and had been receiving long-term medications, such as mirtazapine, escitalopram oxalate, and lorazepam.