Subepithelial deposits are seen in –
**Core Concept**
Subepithelial deposits refer to the accumulation of immune complexes or other substances in the subepithelial region of tissues, such as the kidney or skin. This phenomenon is often associated with autoimmune diseases, where the immune system produces antibodies against self-antigens, leading to their deposition in tissues.
**Why the Correct Answer is Right**
Subepithelial deposits are characteristic of membranous nephropathy, a type of kidney disease caused by the deposition of immune complexes in the subepithelial space of the glomerular basement membrane. This leads to the activation of the complement system, inflammation, and eventual damage to the renal tissue. The correct answer is a condition where this type of deposition is commonly seen.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because subepithelial deposits are not typically associated with IgA nephropathy, which is characterized by mesangial deposits rather than subepithelial deposits.
**Option B:** This option is incorrect because lupus nephritis can have various types of deposits, including mesangial, subendothelial, and intramembranous deposits, but not typically subepithelial deposits.
**Option C:** This option is incorrect because Henoch-Schönlein purpura is characterized by IgA deposits in the mesangium, not subepithelial deposits.
**Clinical Pearl / High-Yield Fact**
Remember that the location and type of immune complex deposition can be a crucial clue in diagnosing autoimmune diseases and can guide the choice of treatment.
**Correct Answer: C. Henoch-Schönlein Purpura.