All are seen in Samters triad except-
**Core Concept**
Samter's triad is a rare condition characterized by the combination of aspirin sensitivity, asthma, and nasal/ethmoidal polyposis. This condition is often associated with a genetic deficiency in the enzyme arachidonate 5-lipoxygenase, which is involved in the production of leukotrienes - key mediators of inflammation.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of Samter's triad. Aspirin sensitivity in Samter's triad is due to the inhibition of cyclooxygenase (COX) enzymes by aspirin, leading to an imbalance between the production of prostaglandins (PGs) and leukotrienes (LTs). The increased production of LTs, particularly LTB4 and LTC4, contributes to the inflammatory response and exacerbates asthma symptoms. Nasal/ethmoidal polyposis is thought to be triggered by the chronic inflammation and tissue damage caused by the imbalance of PGs and LTs.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is actually a component of Samter's triad. Aspirin sensitivity is a hallmark of the condition, making it an incorrect choice.
**Option B:** This option is incorrect because asthma is a key component of Samter's triad. The condition is often characterized by severe, aspirin-exacerbated respiratory disease (AERD).
**Option C:** This option is incorrect because nasal/ethmoidal polyposis is a common feature of Samter's triad, particularly in patients with AERD.
**Clinical Pearl / High-Yield Fact**
Samter's triad is often associated with a genetic deficiency in the enzyme arachidonate 5-lipoxygenase, which is involved in the production of leukotrienes. This deficiency can lead to an imbalance between the production of PGs and LTs, resulting in the characteristic symptoms of Samter's triad.
**Correct Answer:** D