Please select the eligibility criteria that correspond to the clinical trial below.
Title: Randomized Clinical Trial Comparing Surveillance and Selective Surgical Treatment for Abdominal Aortic Aneurysms Less Than 5.5 cm in Diameter Versus Early Endovascular Treatment
Brief Summary: Objective of the present study is to compare endovascular repair versus surveillance and, eventually delay treatment in patients with small abdominal aortic aneurysms (AAA), with respect to patient survival, AAA rupture and AAA related death risks.


Options:
A: Inclusion Criteria:

* Asymptomatic, infrarenal AAA that requires surgery
* Adequate infrarenal neck
* Other aortic-iliac anatomical configuration suitable for EVAR according to the criteria of the device to be used
* Patient having a life expectation of at least 2 years and cleared for transabdominal intervention
* Signed informed consent

Exclusion Criteria:

* ruptured AAA or symptomatic AAA, which requires emergency surgery
* maximum aneurysm diameter\< 5.0 cm
* suprarenal AAA
* Inflammatory AAA (more than minimal wall thickening)
* infrarenal neck unsuitable for endovascular fixation or aortic-iliac anatomic configuration otherwise unsuitable for EVAR according to criteria of the device to be used
* bilateral retroperitoneal incision required for EVAR
* sacrifice of both hypogastric arteries required
* anatomical variations, i.e. horseshoe-kidney, arteries requiring reimplantation
* patient unsuitable for laparotomy
* administration of contrast agent not possible: proved, severe systemic reaction to contrast agent
* active infection present
* transplantation-patients
* limited life expectation due to other illness (\< 2 year)
* non-iatrogenic bleeding diathesis
* connective tissue disease
B: Inclusion Criteria:

* AAA with a maximum external diameter in any plane greater than or equal to 5 cm.
* An iliac aneurysm (associated with an AAA) with a maximum external diameter in any plane greater than or equal to 3 cm.
* AAA greater than or equal to 4.5 cm and the AAA has increased by greater than or equal to 0.7 cm in diameter in 6 months.
* An AAA greater than or equal to 4.5 cm and the AAA has increased by greater than or equal to 1 cm in diameter in 12 months.
* An AAA greater than or equal to 4.5 cm and the AAA is saccular (i.e., a portion of the circumference of the aorta at the level of the aneurysm is considered normal based on CT scan or MRI).
* An AAA greater than or equal to 4.5 cm and the AAA is associated with distal embolism.

  * as measured from two imaging studies (ultrasound CT scan or MRI) within the appropriate interval, the later one within 6 months of randomization.

Exclusion Criteria:

* Patient has had a previous AAA repair procedure
* Evidence of AAA rupture by imaging test
* AAA is not elective (i.e., urgent or emergent operation, usually due to suspected rupture)
* Likelihood of poor compliance to the protocol
* Patient refused randomization
* Physician refused randomization
C: Inclusion Criteria:

* 40 to 90 years of age
* Meet all indications for use as stated in the Medtronic Vascular AAA Endograft Instructions for Use
* Maximum aneurysm diameter of 4-5cm
* If female patient with child bearing potential, must have a documented negative pregnancy test within seven(7)days prior to inclusion
* Patient is willing and able to comply with the specified follow-up evaluation
* Life expectancy at least 3 years

Exclusion Criteria:

* Meet any of the Contraindications stated in the Medtronic Vascular AAA Endograft instructions for Use
* Known co-existing condition with a life expectancy of less than 3 years
* Major surgical or interventional procedure (vascular and/or non-vascular)within 30 days prior to study enrollment
* Subjects enrolled in another clinical trial or anticipated to be included into a trial, which may interfere with this study, or subjects already enrolled in this trial before.
* Planned conduit procedure for introduction of endograft
D: Inclusion Criteria:

* Patients of 50-80 years of age
* Non symptomatic infrarenal AAA of 4.1 to 5.4 cm in diameter measured by CT performed within 3 months before randomization
* Adequate infrarenal aortic neck (length \> 15 mm diameter \< 30 mm) and other anatomical configurations suitable for EVAR
* Patients have a life expectancy of at least 5 years
* Signed informed consent

Exclusion Criteria:

* Ruptured or symptomatic AAA
* AAA maximum diameter \>= 5.5 cm
* Suprarenal or thoracic aorta aneurysm of more than 4.0 cm
* Patient unsuitable for administration of contrast agent
* Severe heart, lung, liver or renal disease (serum creatinine \>= 3mg/dl)
* Need for adjunctive major surgical or vascular procedures within 1 month
* High likelihood of non compliance with follow-up requirements

Answer: D