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:

* Patients aged 50 years old or more (more than 80 possible depending on physiological age)
* Level 0, 1, or 2 of operative risk
* Abdominal aortic aneurysm with a diameter \> or equal to 50 mm or \> or equal to 40 mm if rapid growing (10 mm or more in a year), or painful, or saccular aneurysms, or aneurisms of common iliac arteries with a diameter equal or superior to 30 mm; or women with a diameter equal to 45 mm;
* Aortic neck superior or equal to 1.5 cm
* No stenosis superior or equal to 75% of the superior mesenteric artery
* Proximal neck angulation inferior to 80°
* Diameter of the iliac arteries compatible with introducer sheath
* Inform consent signed

Exclusion Criteria:

* Aneurysm involving the renal arteries or with the length of the neck less than 1.5 cm
* Thrombus or major calcification in the neck
* Diameter of the iliac arteries not compatible with introducer sheath
* Level 3 of operative risk
* History of major iodine allergy (Quincke oedema, anaphylactic shock)
* Other comorbidity with life expectancy less than 6 months
* Follow up impossible during the trial
* Participation in another trial
* Inform consent not signed
B: 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
C: 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
D: 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

Answer: B