<unk>  is usually caused by obstructive uropathy. The obstructive uropathy may be at the urinary bladder or urethral level. Obstructive causes have been caused by prostate disease, kidney cyst, retroperitoneal fibrosis, and supernumerary kidney. Traumatic cases tend to occur on one side, while obstructive cases tend to be bilateral. In cases caused by urinoma, the<unk>  is usually on the same side of it. Rarely, it can be on both sides or on the opposite side of the urinoma. It can also be caused by renal biopsy, kidney transplantation, lithotripsy, failed tube nephrostomy, or cancer of the urinary tract.
Urinothorax
Hemothorax
Chylothorax
Hydropneumothorax
Hemopneumothorax
Pulmonary hematoma
Fibrothorax
Pneumothorax