Figure 1.

COVID-19 Pneumonia phases and possible evolutions. In (a), a subpleural ground-glass opacity (white arrow in (a)) indicating phase 1 is appreciable; in (b), extensive subpleural crazy paving pattern (black arrow in (b)) is preferrable to phase 2 and white dotted arrows indicate peripheral pulmonary vessel widening; in (c), consolidations (black circles in (c)) suggest phase 3; in (d), irregular consolidations coexisting (black dotted arrows in (d)) with ground glass opacities (black arrow in (d)) and crazy paving (black arrows in (d)) represent phase 4; in e, ARDS, a possible complication of COVID-19 pneumonia, presenting with asymmetric dependent consolidations (black asterisk in (e)) and widespread confluent ground glass opacities.