Imaging of the skin, subcutis, and galea aponeurotica.

An understanding of the anatomy of the layers of the scalp helps to interpret the radiology and therefore differentiate between various pathologic processes. This article describes the anatomy of the scalp and highlights the common, and some less common, pathologies that occur. Computed tomography, magnetic resonance imaging, and ultrasound can all help to categorize a lesion in the scalp.