## **Core Concept**
HIV-associated nephropathy (HIVAN) is a significant cause of chronic kidney disease in HIV-positive patients. It primarily affects the glomeruli and is characterized by specific pathological changes. The condition is strongly associated with certain genetic markers.

## **Why the Correct Answer is Right**
HIVAN, also known as HIV-associated nephropathy, typically presents with **focal segmental glomerulosclerosis (FSGS)** on renal biopsy. This condition is a leading cause of kidney disease in HIV-infected individuals, particularly those of African descent. The pathogenesis involves direct viral infection of renal cells and an immune-mediated response. The presence of **FSGS** is a hallmark, although other patterns like membranoproliferative glomerulonephritis can also occur.

## **Why Each Wrong Option is Incorrect**
* **Option A:** Minimal change disease is characterized by nephrotic syndrome with minimal changes on light microscopy but foot process effacement on electron microscopy. It is not specifically associated with HIV.
* **Option B:** Membranous nephropathy involves the formation of immune complexes on the subepithelial side of the glomerular basement membrane. While it can cause nephrotic syndrome, it is not the most common glomerulopathy associated with HIV.
* **Option D:** IgA nephropathy (Berger's disease) is characterized by the deposition of IgA antibodies in the glomeruli and often presents with hematuria. It is not specifically linked to HIV infection.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **HIVAN is strongly associated with African American patients** and those with a specific genetic predisposition. Early diagnosis and antiretroviral therapy can significantly slow the progression of kidney disease in these patients. Clinicians should have a low threshold for obtaining a renal biopsy in HIV-positive patients with kidney dysfunction to confirm the diagnosis.

## **Correct Answer:** . FSGS