Nephrotic Syndrome: This condition is characterized by heavy proteinuria, hypoalbuminemia, and edema. The renal artery clot could be a secondary complication due to the hypercoagulable state often associated with nephrotic syndrome.

Renal Vein Thrombosis: Although more commonly associated with renal vein thrombosis, the clot could have extended to the renal artery, and conditions like membranous nephropathy or other glomerulopathies could lead to both hypoalbuminemia and an increased risk of thrombosis.
Systemic Lupus Erythematosus (SLE): SLE can cause nephritis leading to hypoalbuminemia and also has a high risk of thrombotic events, including renal artery clots, due to antiphospholipid syndrome.
Vasculitis (e.g., ANCA-associated vasculitis): Certain types of vasculitis can affect the kidneys, leading to renal dysfunction and hypoalbuminemia, and also increase the risk of vascular clots.

Antiphospholipid Syndrome: This condition is characterized by a hypercoagulable state and can cause both arterial and venous clots, including renal artery clots, and can also lead to nephrotic syndrome or other renal manifestations.
Renal Cell Carcinoma: Although less common, a renal cell carcinoma could cause a renal artery clot and also lead to paraneoplastic syndromes that result in hypoalbuminemia.
Thrombotic Thrombocytopenic Purpura (TTP) or Hemolytic Uremic Syndrome (HUS): These conditions are characterized by microangiopathic hemolytic anemia, thrombocytopenia, and renal failure, which could potentially lead to hypoalbuminemia and renal artery clots.

Atypical Hemolytic Uremic Syndrome (aHUS): A rare condition that could lead to renal failure, hypoalbuminemia, and potentially renal artery clots due to its association with thrombotic microangiopathy.
Renal Artery Embolism from a Paradoxical Embolism: In patients with a patent foramen ovale, an embolism could paradoxically embolize to the renal artery, causing a clot, and if associated with another condition, could lead to hypoalbuminemia.