RID49887 comet-tail artifact

definition TIRADS: Comet-tail artifacts: A comet-tail artifact is a type of reverberation artifact. The deeper echoes become attenuated and are displayed as decreased width, resulting in a triangular shape. If an echogenic focus does not have this feature, a comet-tail artifact should not be described.

comment TIRADS: Recently, authors have subclassified comet-tail artifacts into small and large types and found a prevalence of malignancy of 15% in nodules that had echogenic foci with small comet-tail artifacts [12]. Conversely, when considering large comet-tail artifacts in cystic or partially cystic nodules, multiple studies have shown a strong association with benignity.