Vascular Pathology and Aneurysms Flashcards

A patient develops a painful, pulsatile mass in the right groin 3 days after a cardiac catheterization. Duplex ultrasound reveals a swirling mass of blood adjacent to the common femoral artery, connected by a narrow tract. Doppler analysis of the tract shows high-velocity, to-and-fro flow. What is the most likely diagnosis?

Answer: Pseudoaneurysm

The clinical history of a recent arterial puncture, combined with the sonographic findings of a contained, swirling blood collection (often showing a 'yin-yang' sign) connected to the native artery by a tract with a characteristic to-and-fro spectral Doppler waveform, is pathognomonic for a pseudoaneurysm. A hematoma would be a collection of blood without internal arterial flow, and an AV fistula would demonstrate a direct connection between an artery and vein with high-velocity, low-resistance flow.

When measuring the maximum diameter of an abdominal aortic aneurysm (AAA) via ultrasound, what is the standard protocol for caliper placement?

Answer: Outer wall to outer wall

The standard and most reproducible method for measuring an AAA is to measure the total vessel diameter from the outer wall to the outer wall. This method is used in major clinical trials and for surgical decision-making because it includes the vessel wall and any mural thrombus, providing the true maximum dimension of the aneurysm.

Which of the following is the most common complication associated with a popliteal artery aneurysm?

Answer: Embolization

While rupture can occur, it is much less common than with aortic aneurysms. The most frequent and clinically significant complication of a popliteal artery aneurysm is the formation of thrombus within the aneurysm sac, which can then embolize distally, leading to acute limb ischemia.

A 70-year-old male presents with sudden, severe 'tearing' chest pain radiating to his back. An abdominal ultrasound visualizes a linear, echogenic structure fluttering within the aortic lumen, separating it into two distinct channels. What is this classic finding called?

Answer: Intimal flap

The clinical presentation is highly suggestive of an aortic dissection. The sonographic finding of a mobile, linear structure within the lumen that separates a true lumen from a false lumen is the characteristic intimal flap, which represents the torn intimal layer of the vessel wall.

An abdominal aorta is generally considered aneurysmal when its maximum diameter exceeds what measurement?

Answer: 3.0 cm

While the normal aortic diameter can vary, a maximum outer diameter of 3.0 cm or greater is the widely accepted threshold for defining an abdominal aortic aneurysm (AAA). A diameter of 5.0 to 5.5 cm is often the threshold for considering surgical or endovascular repair.

Which of the following vascular pathologies is characterized by a non-atherosclerotic, non-inflammatory process that causes abnormal cell growth in the arterial wall, often leading to a 'string of beads' appearance on angiography?

Answer: Fibromuscular dysplasia (FMD)

Fibromuscular dysplasia (FMD) is a condition causing stenosis or aneurysms in medium-sized arteries, most commonly the renal and internal carotid arteries. The classic angiographic 'string of beads' appearance is caused by alternating areas of medial fibroplasia (causing stenosis) and aneurysmal dilatation. Giant cell arteritis is inflammatory, Buerger's disease is an inflammatory vasculopathy linked to tobacco, and Marfan syndrome is a connective tissue disorder.