[Doppler color ultrasonography with contrast media in the study of eye and orbit neoplasms].
We investigated the diagnostic efficacy of the i.v. administration of a sonography (US) contrast agent to study eye and orbit tumors at different stages. We administered Levovist (Schering), an air microbubble stabilized by fatty acid, which is specific for angiographic indications. Baseline color Doppler US was performed on 24 selected patients and tumor vascularization patterns were classified into three classes. Color Doppler signal enhancement was assessed after contrast agent administration and the signal-to-noise ratio (SNR) was improved in 70% of cases, which helped identify vascular patterns and improved flowmetric accuracy. The Doppler effect was also improved and vascular signal was always enhanced. The SNR was improved also by the postcontrast detection of small vessels missed on baseline scans. Doppler signal enhancement was proportional to precontrast vascularization and depended on tumor size, with poor results in lesions < 5 mm. In contrast, vascular signal spots with increased postcontrast echogenicity sometimes caused excessive noise affecting the results. No correlation was found between signal enhancement and lesion histotype or between signal and lesion site. Treated lesions exhibited poorer contrast agent enhancement. The examination technique must be accurate and the various parameters set optimally, especially the velocity scale, gain and filtration; the unit must feature adequate recording capabilities (mm/s). To conclude, we believe that the routine use of i.v. US contrast agents will play a major role in improving diagnostic imaging in oculistics also thanks to the lack of untoward reactions and to the ease of contrast agent preparation.
Coppola
V
V
Istituto di Scienze Radiologiche, Università Federico II, Napoli.
Vallone
G
G
Verrengia
D
D
Alfinito
M
M
Molese
V
V
Brunese
L
L
Smaltino
F
F
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003287:Contrast Media; D005134:Eye Neoplasms / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000000981:diagnostic imaging*; D018615:Ultrasonography, Doppler, Color / Q000379:methods
D003287:Contrast Media
L'eco color Doppler con mdc nello studio delle neoplasie dell'occhio e dell'orbita.