[Conventional ultrasound diagnostics in dermatology].

The imaging of changes to the skin, the subcutis and especially the regional lymph nodes by high-resolution ultrasound is an integral part of routine dermatological diagnostics. This is mainly done with electronic scanners operating at frequencies between 7.5 and 20 MHz (conventional ultrasound diagnostics). In addition, there are very high-frequency ultrasound systems (frequencies up to 100 MHz) that are used for special scientific questions. Ultrasound diagnostics has a number of advantages over other cross-sectional imaging techniques but is more dependent than these on the individual experience of the examiner. Structured training and continuing education are therefore essential for ultrasound diagnostics, also in dermatology. The following overview describes the most important indications for conventional sonography in dermatology in addition to the physical, technical and administrative principles.