Cracked Earth Sign: A Novel Sonographic Descriptor of Subcutaneous Edema – A Teaching Tool

Background: Subcutaneous edema is a common condition seen on ultrasonography, characterized by thickening of the subcutaneous tissue with anechoic or hypoechoic fluid-containing spaces interspersed among fat lobules. The current descriptive term “cobblestone appearance” is used to describe this finding, but the metaphor lacks the vividness of the irregular, reticular pattern we have observed. Observation: We propose the “Cracked Earth Sign” as a novel sonographic sign to describe subcutaneous edema. The sign is defined by thickening of the subcutaneous tissue with irregular, reticular, or branching anechoic or hypoechoic clefts interspersed among fat lobules, resembling cracks in dry, sun-baked earth. Unlike the cobblestone sign, which focuses attention on individual fat lobules, the term “cracked earth sign” emphasizes the reticular network of clefts as a whole, offering a more intuitive visualization of edema distribution. Conclusion: The “Cracked Earth Sign” provides a simple, intuitive sonographic sign for recognizing subcutaneous edema. It may serve as a useful teaching tool for trainees.