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Table 1: Intracavernous and petrosal sinus gradient of ACTH levels
Case No. Age, y, Sex Side Drainage Route Central/Peripheral Ratio of ACTH Level
Ant. Mid. Post. IPS
1 58, F rt PP, IPS 1.0 1.4 1.3 1.0
lt IPS 4.9 1.5 12.6 7.0
2 63, F rt IPS 1.0 1.0 1.0 1.0
lt IPS 1.0 1.0 1.0 0.9
3 45, F rt PP, IPS 8.4 8.4 11.8 0.8
lt PP, IPS 4.9 24.3 67.8 2.3
4 41, F rt PP 34.8 5.3 0.9 0.8
lt IPS 0.9 0.8 0.8 0.8
5 66, F rt IPS – – 2.1 4.6
lt IPS 1.3 1.3 1.6 2.5
Note:— IPS indicates inferior petrosal sinus; PP, pterygoid plexus; Ant., anterior; Mid., middle; Post, posterior; rt, right; lt, left; F, female; ACTH, adrenocorticotropic hormone.

Case No.	Age, y, Sex	Side	Drainage Route	Central/Peripheral Ratio of ACTH Level
Case No.	Age, y, Sex	Side	Drainage Route	Ant.	Mid.	Post.	IPS
1	58, F	rt	PP, IPS	1.0	1.4	1.3	1.0
		lt	IPS	4.9	1.5	12.6	7.0
2	63, F	rt	IPS	1.0	1.0	1.0	1.0
		lt	IPS	1.0	1.0	1.0	0.9
3	45, F	rt	PP, IPS	8.4	8.4	11.8	0.8
		lt	PP, IPS	4.9	24.3	67.8	2.3
4	41, F	rt	PP	34.8	5.3	0.9	0.8
		lt	IPS	0.9	0.8	0.8	0.8
5	66, F	rt	IPS	–	–	2.1	4.6
		lt	IPS	1.3	1.3	1.6	2.5