Which of the following about Nonbacterial thrombotic endocarditis (NBTE) is false?
**Core Concept**
Nonbacterial thrombotic endocarditis (NBTE) is a form of endocarditis characterized by the formation of sterile, platelet-rich thrombi on the heart valves, often in association with hypercoagulable states, malignancy, or systemic lupus erythematosus.
**Why the Correct Answer is Right**
NBTE typically involves the formation of small, sterile vegetations composed of platelets and fibrin, which are often located on the atrioventricular valves. This process is usually a result of an underlying hypercoagulable state, such as malignancy, antiphospholipid syndrome, or systemic lupus erythematosus. The formation of these vegetations does not involve the typical bacterial invasion seen in infective endocarditis.
**Why Each Wrong Option is Incorrect**
**Option A:** NBTE can indeed be associated with the presence of cancer, as malignant cells can activate the coagulation cascade and lead to the formation of thrombi on the heart valves. This statement is true.
**Option B:** NBTE is often characterized by the presence of small, sterile vegetations on the heart valves, which is a hallmark of this condition. This statement is true.
**Option C:** NBTE can indeed be associated with systemic lupus erythematosus, as patients with this autoimmune disorder are at increased risk of developing a hypercoagulable state and subsequent NBTE. This statement is true.
**Clinical Pearl / High-Yield Fact**
It's essential to differentiate NBTE from infective endocarditis, as the management and prognosis of these two conditions can differ significantly. A key differentiating feature is the absence of bacterial invasion in NBTE, which can be confirmed by negative blood cultures.
**Correct Answer:** D