Collapsing glomerulopathy, features are –
**Core Concept**
Collapsing glomerulopathy is a type of focal segmental glomerulosclerosis (FSGS) characterized by collapse of the glomerular tuft, often due to podocyte injury and detachment from the glomerular basement membrane. This condition is associated with significant proteinuria and renal dysfunction.
**Why the Correct Answer is Right**
The correct answer is characterized by the collapse of the glomerular tuft, leading to obliteration of the capillary lumen and formation of a sclerotic scar. This collapse is often accompanied by podocyte effacement and detachment, resulting in severe proteinuria. The pathogenesis of collapsing glomerulopathy is believed to involve podocyte injury and subsequent loss of the slit diaphragm, leading to disruption of the glomerular filtration barrier.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the characteristic collapse of the glomerular tuft.
**Option B:** This option is incorrect because it does not specify the involvement of podocyte injury and detachment in the pathogenesis of collapsing glomerulopathy.
**Option C:** This option is incorrect because it is a feature of other types of glomerulonephritis, not specifically collapsing glomerulopathy.
**Clinical Pearl / High-Yield Fact**
Collapsing glomerulopathy often presents with rapidly progressive glomerulonephritis (RPGN) and severe proteinuria, requiring prompt initiation of immunosuppressive therapy to prevent progression to end-stage renal disease.
**Correct Answer:** C.