Initial blood tests showed hypoalbuminemia (6 g/L) and anemia (Hb 92 g/L). Urinalysis performed after the CT showed a protein concentration of 4.92 g/L (protein/creatinine ratio 593). Together with the severe fluid overload seen on CT, these findings are diagnostic of nephrotic syndrome. Nephrotic syndrome is known to cause a hypercoagulable state, and it is a common cause of renal vein thrombosis. The patient was subsequently diagnosed with SLE and lupus nephritis (positive ANA and anti-dsDNA, weak positive ENA and Anti-Sm).