Minimal change glomerulopathy may be seen in association with all of the following except –
**Core Concept**
Minimal change glomerulopathy (MCGN) is a type of nephrotic syndrome characterized by the loss of foot processes of podocytes, leading to massive proteinuria. This condition is often idiopathic but can be associated with various systemic diseases and secondary causes.
**Why the Correct Answer is Right**
MCGN is typically associated with conditions that trigger an immune response or alter the glomerular filtration barrier. The condition is often seen in association with infections, autoimmune diseases, and malignancies. The loss of foot processes of podocytes is thought to be mediated by immune complexes and complement activation. Relevant enzymes and pathways involved in MCGN include the alternative complement pathway and the podocin-nephrin complex.
**Why Each Wrong Option is Incorrect**
**Option A:** Focal segmental glomerulosclerosis (FSGS) is actually a common cause of secondary MCGN, especially in the context of HIV infection or obesity-related glomerulopathy. Therefore, FSGS is not an exception to the association with MCGN.
**Option B:** Lupus nephritis is a classic example of a systemic autoimmune disease that can present with MCGN as part of its renal manifestations. Thus, option B is incorrect.
**Option C:** Hepatitis B and C infections have been associated with MCGN, although the exact mechanisms are unclear. This association makes option C incorrect.
**Clinical Pearl / High-Yield Fact**
MCGN is often responsive to corticosteroids and immunosuppressive agents, especially in the context of secondary causes. Early treatment can improve renal outcomes and reduce the risk of progression to end-stage renal disease.
**Correct Answer:** D.