Hi,Welcome to Healthcaremagic. I appreciate your concern for your Grand Father.Well,As You have been told that angioplasty is entering a blood vessel which is clogged ,inserting a dye which acts as a contrast material and visualising it under the images formed after radiation with X rays,looking for the extent of disease and putting a stent which is a small tube which helps preventing the vessel from blocking again. This is commonly performed in heart vessels but also performed on vessels supplying other organs.The clogging of intestinal vessels is relatively uncommon but the procedure is being increasingly performed before the advent of which the resection of the effected intestine was only option if the condition is not controlled with medications. Coming to the risks,it is a minimal invasive procedure and doesn t carry the morbidity of a surgery.It is done under local anesthesia or mild sedation and hence the risks of a general anesthesia are not there.Recovery after procedure is excellent as it is done through a very small opening and is associated with mild pain which is very well controlled by routine pain medications. But as a note of caution,every procedure is inherently associated with few risks.The note worthy complications are, 1)Bleeding ,bruising,infection at the site of entry.(prior tests to assess the blood coagulation, Prothrombin time(PT) and Activated partial thromboplastin time (APTT) are done) 2)Bleeding inside due to trauma to the blood vessel. 3)If the kidney functioning is not proper then the injected may damage kidneys.To avoid that kidney function tests (blood urea and serum creatinine) are done before hand. 4)some times due to trauma to the blood vessel a local dilatation of the vessel occurs which is called Aneurysm . But usually the procedure is without complications.Hope all the best for your Grand Father.Hope this helps You. Thank You.