Atrial myxoma commonly arises from
**Core Concept**
Atrial myxoma is the most common type of primary cardiac tumor, and its most frequent location is a key aspect of its diagnosis. The **interatrial septum** is particularly relevant in this context.
**Why the Correct Answer is Right**
The correct answer is related to the fact that atrial myxomas most commonly arise from the **interatrial septum**, specifically around the **fossa ovalis**. This area is prone to the development of these benign tumors due to its embryological origin.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, although atrial myxomas can occur in any chamber, they are less commonly associated with this option.
**Option B:** Incorrect as it is not the most common site.
**Option D:** Incorrect because it's not typically associated with the origin of atrial myxomas.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that atrial myxomas can mimic other cardiac conditions, such as **mitral stenosis**, due to their ability to obstruct blood flow.
**Correct Answer:** D. Left atrium, specifically from the interatrial septum.