Figure. Chest computed tomography (CT) images at the level of the upper third and the lower third of the lung in a patient with pulmonary histoplasmosis, Switzerland. A, B) Initial CT shows diffuse reticulonodular pattern with ground glass opacifications, predominantly located in the upper two thirds of the lungs, and several areas with reverse halo signs (red arrows). C, D) Follow-up CT scan exhibited reduced ground-glass opacities and a regression of the micronodules. The reversed halos showed complete regression. CT, computed tomography.