000 Hemophilus Influenza Infection Hemophilus Influenza H influenzae pneumonia in a 49-year-old woman with breast cancer, fever, and a productive cough. High-resolution CT scan shows diffuse centrilobular nodules and branching linear opacities, resulting in the tree-in-bud pattern.Rossi, SE et al Tree-in-Bud Pattern at Thin-Section CT of the Lungs: Radiologic-Pathologic Overview RadioGraphics Vol. 25, No. 3 2005