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 Indian J Med Microbiol  
 

Both microcatheters are in position, securely in the petrosal sinus. Note the double radioopaque markers (arrowheads), which denote the soft floppy segment of the microcatheter. At this point, sampling can start.

Both microcatheters are in position, securely in the petrosal sinus. Note the double radioopaque markers (arrowheads), which denote the soft floppy segment of the microcatheter. At this point, sampling can start.