Fig. 16From: Chest imaging using signs, symbols, and naturalistic images: a practical guide for radiologists and non-radiologistsGinkgo leaf sign. A chest radiograph of a patient with diffuse subcutaneous emphysema. The post-surgical radiograph clearly shows a large amount of air located in the subcutaneous tissues, penetrating into the pectoral muscle fibers (black asterisk). This striated appearance resembles a ginkgo leafBack to article page