Results for mean, range, and upper limits of normal PVST thickness on MDCT*
| Mean PVST Thickness (range) (mm) | Upper Limit of Normal PVST Thickness (mm) | |
|---|---|---|
| C1 | 4.4 (1.5–11) | 8.5 |
| C2 | 3.7 (1.5–8.5) | 6 |
| C3 | 4.2 (2–9.5) | 7 |
| C4 | 7 (2.5–16) | N/C |
| C5 | 12.4 (5–20) | N/C |
| C6 | 13 (5.5–24) | 18 |
| C7 | 11.6 (2.5–21) | 18 |
Note:—N/C indicates that upper limits of normal at C4 and C5 were not calculated due to the inconsistent position of the esophagus and larynx among the patient population: PVST, prevertebral soft tissue; MDCT, multidetector CT.
* Upper limit of normal calculated as 2 SDs above the mean maximum value for 97.5% of the population.