Which of the following is the cause of break of glomerular basement membrane sometimes and sub epithelial deposits in electron microscopy?-
## **Core Concept**
The question tests knowledge of renal pathology, specifically the causes of alterations in the glomerular basement membrane (GBM) and the presence of subepithelial deposits. The GBM is a critical component of the glomerulus, and changes in its structure or the presence of deposits can indicate various kidney diseases.
## **Why the Correct Answer is Right**
The correct answer, **Goodpasture's syndrome**, is associated with the production of autoantibodies against the alpha-3 chain of type IV collagen in the GBM. This autoimmune response can lead to damage and disruption of the GBM. However, Goodpasture's syndrome is more commonly associated with anti-GBM antibodies and typically presents with linear immunofluorescence along the GBM and subepithelial deposits are not the hallmark but it can cause breaks in GBM.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Minimal Change Disease is characterized by the loss of foot processes of podocytes and typically does not show significant changes on light microscopy. It does not primarily involve breaks in the GBM or subepithelial deposits.
- **Option B:** Membranous Nephropathy is indeed characterized by the formation of immune complexes on the subepithelial side of the GBM, leading to thickening of the GBM. However, the primary feature is not breaks in the GBM but rather the deposition of immune complexes.
- **Option D:** Post-streptococcal Glomerulonephritis (PSGN) involves immune complex deposition in the mesangium and subepithelial space (humps), but it's not primarily known for causing breaks in the GBM.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Goodpasture's syndrome** is a rare autoimmune disease that can cause rapidly progressive glomerulonephritis and is associated with anti-GBM antibodies. It is a critical diagnosis to consider in cases of rapidly progressive glomerulonephritis.
## **Correct Answer:** .