American Journal of Neuroradiology, Vol 14, Issue 5 1075-1083, Copyright © 1993 by American Society of Neuroradiology
ARTICLES |
Anatomy of the junction of the inferior petrosal sinus and the internal jugular vein
DL Miller, JL Doppman and R Chang
Diagnostic Radiology Department, Warren Grant Magnuson Clinical Center, National Institutes of Health, Bethesda, MD 20892.
PURPOSE: To evaluate the anatomy of the junction of the inferior petrosal sinus and the internal jugular vein. METHODS: Using a previously described classification system, we prospectively classified venous anatomy bilaterally in 135 of 136 persons consecutively undergoing inferior petrosal sinus sampling. RESULTS: Type IV anatomy, with no anastomosis between the inferior petrosal sinus and the internal jugular vein, was significantly less frequent in our series than in a previous series (1 versus 7%; P < .001). Venous anatomy did not differ significantly between the left and the right junctions or between men and women. Venous anatomy was symmetric in only 65% of subjects (86 of 133). We describe an uncommon variant anatomy, incomplete type IV, found in 4.5% of our subjects (six of 133), that may cause incorrect results of petrosal sinus sampling. CONCLUSION: Bilateral sampling of pituitary venous effluent can be accomplished by the methods described, despite the presence of either incomplete or true type IV venous anatomy. Bilateral petrosal sinus sampling is anatomically possible in 99% of persons.
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