Follow-up of endovascular aortic aneurysm repair: Preliminary validation of digital tomosynthesis and contrast enhanced ultrasound in detection of medium- to long-term complications

Table 1 Classification for endoleaks and endotension[4]

Endoleak (type)	Source of perigraft flow
I	Attachment site
A	Proximal end of the stentgraft
B	Distal end of the stentgraft
C	Iliac occluder
II	Branch leaks without attachment site leaks
A	Simple: One patent branch
B	Complex: Two or more patent branches
III	Stentgraft defect
A	Junctional leak or modular disconnect
B	Fabric holes
IV	Stentgraft fabric porosity < 30 d after placement
Endoleak (time of detection)	Primary, present from time of EVAR Secondary, appearing after prior negative CTA
Endotension	AAA enlargement with increased intrasac pressure after EVAR without visualised endoleak on delayed contrast CTA

CTA: Computed tomography angiography; EVAR: Endovascular aortic aneurysm repair.

Table 2 Statistical data

	Sensitivity	Specificity	PPV	NPV	Accuracy
DTA	97%	98%	91%	99%	98%
CEUS	58%	99%	95%	90%	91%

DTA: Digital tomosynthesis of the abdomen; CEUS: Contrast-enhanced ultrasound; PPV: Positive predictive value; NPV: Negative predictive value.

Table 3 Detected complications in digital tomosynthesis of abdomen/contrast-enhanced ultrasound vs computed tomography angiography

Complication	Total (37)	DTA (36)	CEUS (23)
Graft fracture	5	5	5
Graft dislocation	9	8	6
Graft migration	6	6	2
Graft stenosis	9	9	2
Graft fracture and migration	2	2	2
Graft fracture and dislocation	4	4	4
Graft migration and stenosis	2	2	2

DTA: Digital tomosynthesis of the abdomen; CEUS: Contrast-enhanced ultrasound.