Abstract The classic entity of life-threatening aortic dissection represents one pathology of a spectrum of acute conditions coined the acute aortic syndrome comprising dissection, intramural haematoma, penetrating atherosclerotic ulcer, and contained aortic rupture of any cause. On CT, a number of entities that can mimic a dissection should be considered 5: Clinically, a number of causes of acute chest pain are often considered: ADVERTISEMENT: Supporters see fewer/no ads, Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. The aortic root at the mid aortic sinus is 5.4 cm. 2002;223 (1): 270-4. 8. 6. Management of acute aortic dissections. 4. Clinical suspicion is usually based on mechanism and severity of the injury, the hemodynamic status of the patient and/or the presence of related injuries. The aortic knob was very enlarged and had displaced the trachea to the right. On finding extensive descending aortic dissection extending into the abdominal aorta and left common carotid artery, further CTA was performed of the neck, abdomen and pelvis as well as a ECG-gated CTA of the aortic root. 79 (3): 567-73. In most cases the vessel wall is abnormal. 3 4. Aortic dissection is may sometimes be classified as communicating versus non-communicating 16,17. Approximately 60% of dissections involve the ascending aorta (Stanford A or DeBakey I and II) 5. CT is the principal modality used to diagnose acute aortic dissection (AAD). ADVERTISEMENT: Radiopaedia is free thanks to our supporters and advertisers. Thoracic endovascular aortic repair for retrograde type A aortic dissection with an entry â¦ Causes include: Imaging is essential in delineating the morphology and extent of the dissection as well as allowing for classification (which dictates management). Findings: There was a left, apical, pleural cap. 2019]. However, treating these patients with antiplatelets/anticoagulation could be disastrous in aortic dissection. Along with the DeBakey classification, the Stanford classificationÂ 7 is used to separate aortic dissections into those that need surgical repair, and those that usually require only medical management. Blount KJ, Hagspiel KD. Dissections involving the aortic root should ideally be assessed with ECG-gated CTA which nearly totally eliminates pulsation artefact. (2014) Radiology. 1. Case 7: Stanford type A with rupture into pericardium, Case 8: dissection confined to the infrarenal aorta, Case 10: Stanford type B dissecting aneurysm, Case 22: Stanford type A : background Marfan syndrome, Case 25: ruptured Stanford type A aortic dissection, aortic dissection detection risk score (ADD-RS), thoracic aortic dilatation (differential), D-loop transposition of the great arteries, L-loop transposition of the great arteries, ciprofloxacin use (unclear if class effect for fluoroquinolone agents), fluoroquinolones seem to promote loss of extracellular matrix integrity, by several mechanisms, in the UK caution is now advised in using these agents in high-risk patients, acute: within 14 days of first symptom onset, chronic: more than 3 months from the initial onset of symptoms, inherited connective tissue disorders (pathogenesis: medial degeneration), widened mediastinum: > 8.0-8.8 cm at the level of the, inward displacement of atherosclerotic calcification (>1 cm from the aortic margin), left main bronchus inferiorly (decreased angle from the horizontal), increased thickness of the left and/or right paratracheal stripe, an atypical variant that may be seen is an, involvement and supply (from true or false lumen) of aortic branches, signs of organ ischemia or vessel occlusion, often compressed by the false lumen and the smaller of the two, outer wall calcifications (helpful in acute dissections), origin of the celiac trunk, SMA and right renal artery usually arise from the true lumen, often larger lumen size due to higher false luminal pressures, at risk for rupture due to reduced elastic recoil and dilation, often of lower contrast density due to delayed opacification, maybe thrombosed and seen as mural low density only (more common in chronic dissections), the left renal artery usually arises from the false lumen, aggressive blood pressure control with beta-blockers as they reduce both blood pressure and also heart rate hence reduce extra pressure on the aortic wall, immediate surgical repair (for type A dissection or complicated type B dissection), dissection and occlusion of branch vessels, aneurysmal dilatation: this is an indication for endovascular or surgical intervention, rupture into the pericardial sac with resulting. A typical helical scanning protocol for aortic dissection includes the following parameters: 5-mm collimation, 1.5 pitch, and 7.5-mm imaging spacing. It is also seen in other collagen vascular disorders such as rheumatoid arthritis and ankylosing spondylitis. American surgical consensus (2020) 5 defines types A and B according to the location of the intimal tear (both types with additional qualifiers for proximal and distal extent): In contrast, a European surgical consensus document (2018) 6 recognizes dissections of the arch without involvement of the ascending aorta as a distinct category, termed "non-A-non-B dissection": ADVERTISEMENT: Supporters see fewer/no ads, Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Aortitis is a pathologic term for the presence of inflammatory changes of the aortic wall, regardless of the underlying cause. It occurs when blood enters the medial layer of the aortic wall through a tear or penetrating ulcer in the intima and tracks along the media, forming a second blood-filled channel within the wall. 46 (2): 175-90. Other conditions or predisposing factors may also be encountered, in which case they will be reflected in the demographics. 13. Rogers AM, Hermann LK et al. It occurs when blood enters the medial layer of the aortic wall through a tear or penetrating ulcer in the intima and tracks along the media, forming a second blood-filled channel within the wall. Multidetector CT of Aortic Dissection: A Pictorial Review. [online] Available at: https://www.gov.uk/drug-safety-update/systemic-and-inhaled-fluoroquinolones-small-increased-risk-of-aortic-aneurysm-and-dissection-advice-for-prescribing-in-high-risk-patients [Accessed 22 Jun. If the blood-filled channel ruptures through the outside aortic wall, aortic dissection is often fatal.Aortic dissection is relatively uncommon. AJR Am J Roentgenol. Saunders Ltd. ISBN:0702030465. Aortic dissection is the most common form of the acute aortic syndromes and a type of arterial dissection. Diagnostic accuracy of mediastinal width measurement on posteroanterior and anteroposterior chest radiographs in the depiction of acute nontraumatic thoracic aortic dissection. 7. thoracic aortic dilatation (differential), D-loop transposition of the great arteries, L-loop transposition of the great arteries, rupture into the pericardial sac with resulting, medical management with blood pressure control, type A: dissections with a tear in the ascending aorta including a segment with the branching of the brachiocephalic trunk, type B: all dissections with proximal tear distal to the branching of the brachiocephalic trunk, type A: proximal extent in ascending aorta, non-A-non-B dissection: retrograde extent or proximal tear in the arch between the brachiocephalic trunk and left subclavian artery, type B: proximal extent in descending aorta distal to left subclavian artery. 1-2.5 mm collimation causing collapse and often death extent of the aorta separate. 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