CTICasesIdiopathic Organizing Pneumonia mimicking COVID-19
Imaging findings
CT chest shows bilateral, peripheral ground-glass opacities, subpleural sparing, and reverse halo signs (atoll sign). The patient is a chef presenting with one week of fevers and myalgias, but repeated COVID-19 PCR testing was negative.
Key takeaways
The CT appearance of organizing pneumonia (peripheral ground-glass and reverse halo signs) is highly characteristic of COVID-19 during a pandemic, but remains a nonspecific response to lung injury. Idiopathic organizing pneumonia or other viral pneumonias can present with identical CT findings.
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