Inflammatory granulomas are not ground glass nodules. Inflammatory granulomas are a form of inflammation that occurs during wound healing. Inflammatory granuloma is a buildup of macrophages and epithelial cells in the wound, and in addition to macrophages and epithelial cells, neovascularization can build up as well. Frosted glass nodules are an imaging description that generally refers to a rounded, confined shadow of increased density seen in the lungs. They are called frosted glass nodules mainly because the density of the nodule resembles a layer of frosted glass, hence the name. Frosted glass nodules are generally called nodules if they are smaller than 3 cm and masses if they are larger than 3 cm. Most of the frosted glass nodules are benign, and the most likely causes of frosted glass nodules are lung infections or congenital nodules, but a very small number of patients may also have malignant tumors of the lungs, although generally speaking, frosted glass nodules smaller than 8mm are slightly less likely to be malignant. Inflammatory granuloma is a benign lesion caused by inflammation, is safe, the two are not the same thing.