[CT-guided stereotaxic evacuation of XXXX --lateral approach].

@entity1 @entity1410 @entity76
Stereotaxic lateral approach for @entity76 is presented using Leksell's CT-stereotaxic system. All of the procedures are performed in the CT room. @entity1 's head is turned to contralateral side of the @entity1410 30 to 40 degrees with slight flexion of the neck. Stereotaxic apparatus is secured to the head under local anesthesia. @entity1410 is confirmed by computerized tomograms. Three dimensional coordinates of the target point (center of the @entity1410 ) are measured from the vertical and diagonal rods of Leksell's system. Linear skin incision 4 cm in length is made on retromastoid area. Burr-hole is put on just lateral position of the target point, usually 5 to 6 cm posterior and 1 cm above from the external auditory meatus. Transverse or sigmoid sinus does not appeared through the burr-hole by this approach. Specially made Dandy's cannula (3.0 mm in diameter, 220 mm in length) is inserted into the target point, and manual evacuation of the @entity1410 is performed carefully using a syringe. Then Dandy's cannula is replaced by silastic drainage tube (3.5 mm in diameter), and 6,000 Units of Urokinase solved in 2 ml of saline is administered to the @entity1410 cavity. Dissolved @entity1410 is aspirated every 24 hours until the most of the @entity1410 is evacuated. We operated three cases of @entity76 by this method with favorable results. Advantages of this method are as follows: Operative invasion is minimal; The surgeon can check the residual @entity1410 and position of the tip of cannula even at operation, if necessary.
