<prompt> Thumb sign in lateral X-ray of neck seen in:EpiglottitisInternal hemorrhageSaccular cystCa epiglottis  <response>: In epiglottis: A plain lateral soft tissue radiograph of neck shows the following specific features Thickening of the epiglottis--the thumb sign Absence of a deep well-defined vallecula--the vallecula sign Steeple sign i.e. Narrowing of subglottic region is seen in chest X-ray of patients of laryngotracheobronchitis i.e. croup. 