A 40-year-old man with a history of intravenous drug use presents with facial swelling, foamy urine, and malaise. Laboratory studies show serum creatinine 0.9 mg/dL, albumin 2.2 g/dL, total cholesterol 320 mg/dL, and urine protein-to-creatinine ratio 5.0 g/g. Urinalysis reveals 3+ protein and oval fat bodies. Which of the following is the most likely underlying renal pathology?

The correct answer to the question "A 40-year-old man with a history of intravenous drug use presents with facial swelling, foamy urine, and malaise. Laboratory studies show serum creatinine 0.9 mg/dL, albumin 2.2 g/dL, total cholesterol 320 mg/dL, and urine protein-to-creatinine ratio 5.0 g/g. Urinalysis reveals 3+ protein and oval fat bodies. Which of the following is the most likely underlying renal pathology?" is Option C: Focal segmental glomerulosclerosis (FSGS).

The other options — A) Minimal change disease, B) IgA nephropathy, D) Post-streptococcal glomerulonephritis — are incorrect for this USMLE Exam Prep question. As explained above: This is a classic nephrotic syndrome presentation. Given the history of intravenous drug use, which is a risk factor for HIV, focal segmental glomerulosclerosis (FSGS) is the most common cause of nep…