Transient myeloproliferative disorder of the newborn is seen in association with –
**Core Concept**
Transient myeloproliferative disorder (TMD) is a condition characterized by the abnormal proliferation of myeloid cells in the bone marrow and blood of newborns. It is often associated with genetic mutations and is seen in the context of certain congenital conditions. The underlying principle involves **genetic predisposition** and **abnormal hematopoiesis**.
**Why the Correct Answer is Right**
The correct answer is associated with Down syndrome, as TMD is commonly seen in newborns with this condition. The mechanism involves the presence of an extra copy of chromosome 21, which leads to the overexpression of genes involved in hematopoiesis, resulting in the proliferation of myeloid cells. This condition is often self-limiting, but it can increase the risk of developing leukemia later in life.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not specifically associated with TMD in newborns.
**Option B:** This option is also incorrect as it does not have a direct link with TMD.
**Option C:** Similarly, this option is incorrect because it is not a known risk factor for TMD.
**Clinical Pearl / High-Yield Fact**
It is essential to recognize TMD in newborns, especially those with Down syndrome, as it can mimic congenital leukemia. The key to differentiating between the two conditions is the presence of specific genetic mutations and the clinical course of the disease.
**Correct Answer:** D. Down syndrome