Idiopathic nephrotic syndrome is associated with the following except-
**Core Concept**
Idiopathic nephrotic syndrome (INS) is a kidney disorder characterized by excessive loss of protein in the urine, leading to low levels of albumin, hyperlipidemia, and edema. The underlying pathophysiology involves damage to the glomerular filtration barrier, allowing proteins to leak into the urine.
**Why the Correct Answer is Right**
INS is often associated with an overactive immune response, where the body's immune system mistakenly attacks the glomerular basement membrane, leading to inflammation and damage. This immune dysregulation is thought to be mediated by T-lymphocytes and the production of various cytokines, which contribute to the disease process. The most common cause of INS in children is minimal change disease, which is characterized by the absence of significant histopathological changes on light microscopy.
**Why Each Wrong Option is Incorrect**
* **Option A:**
Idiopathic nephrotic syndrome is indeed associated with an increased risk of developing infections, particularly those caused by encapsulated bacteria such as Streptococcus pneumoniae, due to the impaired immune function. However, the association is more related to the secondary immunosuppression rather than an increased susceptibility to infections. Nonetheless, it is true that patients with INS are at a higher risk of infections, making this option incorrect.
* **Option B:**
Focal segmental glomerulosclerosis (FSGS) is actually a common cause of nephrotic syndrome in adults, and is characterized by the scarring of glomeruli. While it is not the most common cause of INS in children, it is a significant cause of nephrotic syndrome in adults and is associated with the disease.
* **Option C:**
Minimal change disease, the most common cause of INS in children, is characterized by the absence of significant histopathological changes on light microscopy. However, it is not the correct answer to this question as it is indeed associated with INS.
**Clinical Pearl / High-Yield Fact**
The prognosis for patients with idiopathic nephrotic syndrome varies depending on the underlying cause and the effectiveness of treatment. Patients with minimal change disease have a good prognosis with corticosteroid therapy, while those with focal segmental glomerulosclerosis have a more guarded prognosis.
**Correct Answer: B. Focal segmental glomerulosclerosis is actually a common cause of nephrotic syndrome in adults and is associated with the disease.**