| Objective: Measurement of diameters and location of inferior vena cava in normaladults was done by CT, and evaluate its values. Materials and methods: The maximumand minimum diameters of inferior vena cava in normal adults were measured. Thedistance between the X—axis (in first liver hilar level, along foreside of vertebra drawinga horizontal) and Y—axis (along starboard of vertebra drawing a perpendicular) andinferior vena cava were measured. The angle of the maximum diameter of inferior venacava with the X—axis was measured, also .All datum were measured, by two physicianssingly.The mean value were dealed with statistics Results: The maximum and minimumdiameters of IVC at the level adjacent to right atrium were 3.09±0.38cm and 2.14±0.30cm.The minimum diameters of IVC was a relative invariablenes (P＞0.05). It's upper limits of95% all were less than 3.0cm in different groups disparted on age and gender. Themaximum diameters of IVC and the ratio of the maximum and minimum diameters werevariable in different groups (P＜0.05=The maximum and minimum diameters of IVC atthe level of first liver hilar were 2.81±0.31cm and 1.89±0.38cm. The minimum diametersof IVC don't change with the different ages (P＞0.05) but change with the differentgenders.(P＜0.05=Moreover the maximum diameters of IVC and the ratio of themaximum and minimum diameters were variable in different groups disparted on age andgender (P＜0.05) The distances between the X—axis and Y—axis and inferior vena cavawere 1.53±0.45cm and 0.43±0.25cm .They were relative invariablenes (P＞0.05) anddidn't change with with the different ages or genders. Their upper limits of 95% all wereless than 2.5cm and 1.0cm in different groups. The angle of the maximum diameter ofinferior vena cava with the X—axis was 31±5°. It don't change with the different ages (P＞0.05) but change with the different genders (P＜0.05) But it's upper limits of 95% all were less than 60°whether female's group or male's group. Conclusion: The minimumdiameter of IVC can be taken as sensitive indexes to evaluate whether IVC is enlarged ornot. The ranges of the location of normal IVC and the angle with the X—axis wereascertainable in CT. It can offer the criterion for judging the IVC's location change indetermining the origin of huge mass in hepaorenal recess.PartⅡ: IVC displacement sign: its value in determining the origin oflarge mass located in hepatorenal recessObjective: To evaluate the value of IVC displacement sign and the alteration of angleof major axis with X axis in determining the origin of huge mass in hepaorenal recess.Materials and methods: Enhanced CT scan was performed in 68 cases withpathologically-proved mass located in hepatorenal recess. The masses were originatedfrom the liver in 25 cases, from right kidney superior in 19 cases, from right adrenal glandin 16 cases, from retroperitoneal in 4 cases. The IVC displacement sign and the alteration ofangle of major axis with X axis were analyzed. Results: The incidence of IVC displacementsign in liver mass was 76.0 % (19/25), in right kidney superior mass as 26.3 % (5/19), inright adrenal gland mass was 56.2% (9/16), in retroperitoneal mass was 50.0% (4/8). Theincidence of enlarged angle of major axis with X axis in liver mass was 68.0% (17/25), inright kidney mass was 10.5% (2/19) , in right adrenal gland mass was 31.2% (5/16) , inretroperitoneal mass was 37.5% (3/8) .There are only two cases that their angles of majoraxis with X axis were minished .Conclusion: 1, The incidence of IVC displacement sign inliver mass is the most. The mass was possibly originated from the liver at most if the massmade the IVC shift to the left and enlarged the angle of major axis with X axis. If the massmade the IVC shift to the behind, it was a rather special sign, the mass was almostoriginated from the liver cauda.2, If the mass made the IVC shift to the forward andenlarged the angle of major axis with X axis, the mass was originated from right adrenalgland. 3, Right kidney superior mass affected the IVC relative little. 4.Retroperitonealmass easily made the IVC shift to the right. 5, Fat mass couldn't commonly impact theIVC. In a word, IVC displacement sign and the alteration of angle of major axis with X axis werevaluable CT signs in determining the origin of huge mass in hepaorenal recess.
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