The ginkgo leaf sign (of subcutaneous emphysema) is a radiographic appearance identified with severe subcutaneous emphysema of the chest wall. Air outlines the fibers of the pectoralis major muscle and forms a streaky pattern that is like the branching pattern in the veins of a ginkgo leaf.

Ginkgo biloba (aka the maidenhair tree) is a tree native to China and is used in traditional medicines.