IgA nephropathy can occur in –
**Core Concept**
IgA nephropathy, also known as Berger's disease, is a kidney disease characterized by the deposition of IgA antibodies in the glomeruli, leading to inflammation and damage. This condition is an example of a glomerulonephritis, specifically a form of immune complex-mediated nephropathy.
**Why the Correct Answer is Right**
IgA nephropathy typically presents with hematuria, particularly after an upper respiratory tract infection, and can progress to renal failure if left untreated. The deposition of IgA antibodies in the glomeruli activates the complement system, leading to the formation of immune complexes that damage the glomerular basement membrane. This process involves the activation of C3 and the production of pro-inflammatory cytokines.
**Why Each Wrong Option is Incorrect**
**Option A:** While IgA nephropathy can occur in conjunction with other conditions, such as Henoch-Schönlein purpura, it is not a direct result of this condition.
**Option B:** IgA nephropathy is not typically associated with the deposition of C3 nephritic factor, which is more commonly seen in dense deposit disease.
**Option C:** While IgA nephropathy can be seen in patients with liver disease, it is not a direct result of liver dysfunction.
**Clinical Pearl / High-Yield Fact**
IgA nephropathy often presents with episodic hematuria, particularly after an upper respiratory tract infection, and can progress to renal failure if left untreated. Recognizing this pattern is crucial for early diagnosis and intervention.
**Correct Answer:** D.