A 48-year-old previously healthy female presents to the ED with a few-day history of shortness of breath, right pleuritic chest pain, and pink sputum. She denies fever or chills. For the past month, she has noticed ankle swelling. She has no previous history of dyspnea, respiratory diseases or heart diseases. She does not smoke and takes no medications including illicit drugs.
On physical examination, she is alert but in mild respiratory distress. Her temperature is 36.8C, blood pressure 156/98, pulse rate 106, and respiratory rate 24. There is no jugulovenous distention and no rash. The lung sound are clear to auscultation bilaterally. Cardiac examination is normal with normal S1 and S2 and no gallop or murmur. Abdomen is neither tender or distended without hepatosplenomegaly. There are 2+ to 3+ edema at ankles and legs.
Laboratory results are as follows; WBC 8600, Platelet 200,000, Hb 14, Hct 43%, BUN 19, Crn 1.4, Na 139, K 4.2, total protein 5.9, albumin 1.9, total cholesterol 312, C3 80 mg/dL, C4 25, ANA negative, Urinalysis = SG 1.015, 4+ protein, oval fat bodies, granular casts, 3-5 RBC, 24-hour urine protein - 10g
CXR – clear lung fields and normal heart size V/Q scan – a mismatch in the right lower lung field Ultrasound of lower extremities – right femoral vein thrombosis
What renal disease is most likely in this patient?