Question:
A multiple side-holed catheter is placed at the level of the diaphragm. Which vascular structures can be imaged in the best way?
A multiple side-holed catheter is placed at the level of the diaphragm. Which vascular structures can be imaged in the best way?
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Catheter Placement Levels for Aortography:
- Ascending Aorta: Coronary Arteries.
- Aortic Arch: Innominate, Carotid, Subclavian (Great vessels).
- T12 (Diaphragm): Celiac, SMA, Renal Arteries (Visceral branches).
- L3/L4 (Bifurcation): Iliac and lower limb run-off.
- Ascending Aorta: Coronary Arteries.
- Aortic Arch: Innominate, Carotid, Subclavian (Great vessels).
- T12 (Diaphragm): Celiac, SMA, Renal Arteries (Visceral branches).
- L3/L4 (Bifurcation): Iliac and lower limb run-off.
Updated On: Sep 3, 2026
- Renal arteries and mesenteric arteries
- Coronary arteries
- Iliac and femoral arteries
- Carotid and subclavian branches
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The Correct Option is A
Solution and Explanation
Concept:
This question tests anatomical knowledge of the aorta and its major branches in relation to topographical landmarks used during diagnostic angiography.
Explanation:
• In diagnostic angiography, a multiple side-holed catheter (such as a pigtail catheter) is designed to rapidly deliver a large bolus of contrast medium, providing a "flush" aortogram that simultaneously opacifies the aorta and its immediate branch vessels.
• The positioning of the catheter determines which vascular territories are highlighted. The level of the diaphragm anatomically corresponds to the aortic hiatus at the T12 vertebral level.
• Immediately below the diaphragm, in the uppermost portion of the abdominal aorta, lie the origins of the major visceral arteries.
• The Celiac trunk emerges at the T12 level. The Superior Mesenteric Artery (SMA) branches off just below it at the L1 level.
• The right and left Renal arteries arise laterally from the aorta slightly inferior to the SMA origin, typically around the L1-L2 intervertebral disc space.
• Therefore, injecting contrast at the diaphragmatic level ensures robust anterograde flow directly into the celiac, mesenteric, and renal vascular beds, making it the optimal position for visualizing these structures.
• To image the coronary arteries (Option B), the catheter must be at the aortic root. For the iliac and femoral arteries (Option C), it must be placed near the aortic bifurcation (L4). For the carotid and subclavian arteries (Option D), it must be placed in the aortic arch.
Final Answer:
A flush catheter positioned at the level of the diaphragm perfectly targets the upper abdominal aorta, providing excellent visualization of the renal and mesenteric arteries.
This question tests anatomical knowledge of the aorta and its major branches in relation to topographical landmarks used during diagnostic angiography.
Explanation:
• In diagnostic angiography, a multiple side-holed catheter (such as a pigtail catheter) is designed to rapidly deliver a large bolus of contrast medium, providing a "flush" aortogram that simultaneously opacifies the aorta and its immediate branch vessels.
• The positioning of the catheter determines which vascular territories are highlighted. The level of the diaphragm anatomically corresponds to the aortic hiatus at the T12 vertebral level.
• Immediately below the diaphragm, in the uppermost portion of the abdominal aorta, lie the origins of the major visceral arteries.
• The Celiac trunk emerges at the T12 level. The Superior Mesenteric Artery (SMA) branches off just below it at the L1 level.
• The right and left Renal arteries arise laterally from the aorta slightly inferior to the SMA origin, typically around the L1-L2 intervertebral disc space.
• Therefore, injecting contrast at the diaphragmatic level ensures robust anterograde flow directly into the celiac, mesenteric, and renal vascular beds, making it the optimal position for visualizing these structures.
• To image the coronary arteries (Option B), the catheter must be at the aortic root. For the iliac and femoral arteries (Option C), it must be placed near the aortic bifurcation (L4). For the carotid and subclavian arteries (Option D), it must be placed in the aortic arch.
Final Answer:
A flush catheter positioned at the level of the diaphragm perfectly targets the upper abdominal aorta, providing excellent visualization of the renal and mesenteric arteries.
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