Platysma Sign: A Feature of Extra-capsular Spread.

A 60-year-old gentleman presented with a large swelling on the left side of his neck which was diagnosed as a metastatic cervical lymph node. It infiltrated the platysma muscle and caused partial contracture. This is known as Platysma sign. Presence of this sign indicates extracapsular spread and shows poor prognosis. Supplementary Information: The online version contains supplementary material available at 10.1007/s13193-023-01815-8.