ABSTRACT
The use of a long lasting nasal topic vasoconstrictor (NTVC) 15 minutes before CT-scans of nasal & paranasal cavities (N&PC) would be higbly advisable in order to avoid that normal or pathological transitory engorgement of the nasal mucosa can be interpreted as permanent or semipermanent changes in it, or toavoid that such transitory changes could obliterate the vision or importantanatomic or pathologic details, mostly in the middle meatus - a "K" area for interpretation of anterior sinuses inflamatory diseases. From a group of 10 patients who had CT-scans taken before and after the use of NTVC two cases ilustrates it quite well. The presence of swollen tissues not retracted by NTVC would indicate their permanent or semipermanent change. In evaluating nasal lumen patency, CT-scans after the use of NTVC - coronal or semicoronal sectionstaken for studying N&PC - can provide interesting and realistic correlations with rhinomanometric data from noses also decongested. The purpose of thisshort communication was to reiterate the advantage of NTVC use in N&PC CT-scans