Table 1.

Causes of obstruction in renal transplant patients

Risk factors	Intrinsic obstruction	Extrinsic compression	Others
>65 years old More than two transplant arteries Increased cold ischaemia time Stentless anastomotic transplant	Oedema Clot Tumour Calculi	Lymphocele Abscess Haematoma	Ischaemia Kinking Previously unrecognized PUJ obstruction Misplacement of ureteric anastomosis

PUJ, pelviureteric junction.