REV1 and neoplasm: (28) found that type 1 tumours were less enhanced than type 2 tumours on CT-enhanced scans, and we found no statistically significant difference between TEV1, REV1 in CMP and TEV2 in NP, while REV2 in NP type 2 tumours were significantly greater than type 1 tumours and the difference was statistically significant (p=0.014).