**Question:** In Pelger-Huët anomaly, what is the abnormality observed in neutrophils?

**Core Concept:** Pelger-Huët anomaly is a rare autosomal recessive disorder characterized by abnormal granulopoiesis in the bone marrow. It is associated with abnormal neutrophils, lymphocytes, and eosinophils. The primary abnormality lies in the abnormal granules, which are not properly formed or organized, leading to the observed cellular abnormalities.

**Why the Correct Answer is Right:** In Pelger-Huët anomaly, the primary defect lies in the granulopoiesis process, leading to the formation of abnormal neutrophils. The term "Pelger-Huët" refers to the two Belgian scientists who first described the condition, Hans Pelger and Georges Huët. The abnormality is characterized by the presence of large, pale, and loosely packed neutrophils, which are often fragmented or branched. This is due to the abnormal granules that fail to form and organize properly in the neutrophil precursors.

**Why Each Wrong Option is Incorrect:**

A. Pelger-Huët anomaly primarily affects neutrophils, not lymphocytes. Therefore, Option A is incorrect.

B. Pelger-Huët anomaly is a granulopoietic disorder, not specifically affecting eosinophils. Option B is incorrect.

C. While the condition does affect neutrophils, lymphocytes, and eosinophils, this option is too broad and does not specifically address the granulopoietic defect. Option C is incorrect.

D. Pelger-Huët anomaly is a congenital disorder affecting neutrophils, lymphocytes, and eosinophils. While Option D is partially correct, it does not address the granulopoietic defect and the specific abnormality of the granules in neutrophils.

**Clinical Pearl:** Pelger-Huët anomaly is a rare genetic disorder that affects the formation and maturation of neutrophils, lymphocytes, and eosinophils in the bone marrow. The abnormality lies in the granulopoietic process, particularly the granules in neutrophils, leading to the characteristic features of fragmented and branched neutrophils. This genetic disorder is important to recognize as it may lead to anemia and recurrent infections due to impaired neutrophil function.