<prompt> Preveebral space thickness in adult is7mm15mm22mm30mm  <response>: The preveebral component is measured on sagittal imaging as the distance between the anterior border of the veebral body and the air within the pharynxtracheaNear-normal distribution of thickness in normal patients depending on body build and expected variationPlain radiographs:C23: 7 mm and C67: 21 mmCT:C1: 8.5 mmC2: 6 mmC3: 7 mmC4C5: variable due to variable height for cricoidoesophagusC6: 18 mmC7: 18 mmAccording to age:C20-2 years of age: 7.6 mm3-6 years of age: 8.4 mm7-10 years of age: 6.8 mm11-15 years of age: 6.8 mmC60-2 years of age: 9.0 mm3-6 years of age: 9.8 mm7-10 years of age: 12.1 mm11-15 years of age: 14.5 mmRef: Radiology Review ManualBy Wolfgang Dahne 6thEtd, chapter 2 