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Sprial CT scan:application in the diagnosis of hepatic abscess

WANG Zhi ping,LIN Hai yong.Department of Diagnostic Imaging, Wenling First People's Hospital,Zhejiang 317500, P.R.China  
Objective:To study spiral CT findings of hepatic abscess,and evaluate dual phase enhanced spiral CT scan in diagnosis of hepatic abscess.Methods:Spiral CT findings in 28 cases of clinically or pathologically proved hepatic abscesses were retrospectively analyzed.All cases underwent plain CT scans and dual phase enhanced spiral CT scans.5 of them were reconstructed by means of surface shaded display (SSD) and cut in coronal or sagittal direction.Results:Of the 28 cases,plain CT findings revealed low density lesion with spherical shape and ill defined margin (n=17),abscesses cluster sign (n=9),and irregular shape appearance (n=1).Some gas was seen in 1 case of abscess,and it was diagnostic significant.Of 28 cases of hepatic abscess,15 showed periabscess wedge shaped or patchy enhanced area in arterial phase (53.5%).Enhancement of the rim of the lesion (n=10),cluster sign (n=9),and double target sign (n=8) were shown in portal phase.3D imaging of 5 cases demonstrated directly the location and shape of abscesses in a stereoscopic manner.Conclusion:Dual phasic spiral CT is of great value in diagnosis of hepatic abscess. Periabscess wedge shaped or patchy enhancement in arterial phase is another valuable CT sign.
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