What type of clinical presentation of AVM involves a pulsatile warm mass?

The clinical presentation of an arteriovenous malformation (AVM) that involves a pulsatile warm mass is most commonly associated with fast flow. Fast flow AVMs are characterized by a high volume of blood that flows through the abnormal connections between arteries and veins, creating a pulsatile sensation that can be palpated as a warm mass.

In these cases, the rapid movement of blood leads to turbulence and increased venous pressure, which can manifest as palpable thrill or bruit, making them detectable upon physical examination. The warmth is often due to the increased blood flow to the affected area, which can cause the skin temperature to rise.

This understanding helps in differentiating the nature of the AVM and aids in determining the appropriate diagnostic and treatment approaches. Fast flow AVMs may require more urgent intervention compared to other slower presentations, which typically do not present these symptoms. Hence, recognizing the characteristics of fast flow is crucial in the context of AVM assessment and management.