VASCULAR RINGS A CASE - BASED REVIEW
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1 VASCULAR RINGS A CASE - BASED REVIEW Beverley Newman, BSc. MB.Bch. FACR Professor of Radiology Stanford University and Lucile Packard Children s Hospital
2 Q1,2,3 Frontal chest radiographs on three different individuals. For each case suggest the most likely diagnosis. a. No ring or sling b. Vascular ring very likely c. Vascular ring unlikely d. Pulmonary sling very likely e. Pulmonary sling unlikely
3 Case 1: 16month girl with respiratory distress
4 Case 2: 16month girl with respiratory distress
5 Case 3: 2.5 month girl with respiratory distress
6 Q4,5,6 Additional lateral chest radiographs on the same three children. For each case suggest the most likely diagnosis. a. No ring or sling b. Vascular ring very likely c. Vascular ring unlikely d. Pulmonary sling very likely e. Pulmonary sling unlikely
7 Case 1:16month girl with respiratory distress
8 Case 2: 16month girl with respiratory distress
9 Case 3: 2.5 month girl with respiratory distress
10 Q7,8,9 Contrast esophagrams on the same three children. For each case suggest the most likely diagnosis. a. No ring or sling b. Vascular ring very likely c. Vascular ring unlikely d. Pulmonary sling very likely e. Pulmonary sling unlikely
11 Case1: 16month girl with respiratory distress
12 Case 2: 16month girl with respiratory distress
13 Case 3: 2.5 month girl with respiratory distress
14 Q10,11,12 CT axial images on the 3 cases. For each case suggest the most likely diagnosis. a. No ring or sling b. Vascular ring very likely c. Vascular ring unlikely d. Pulmonary sling very likely e. Pulmonary sling unlikely
15 Case1: 16month girl with respiratory distress
16 Case 2: 16month girl with respiratory distress
17 ase 3: 2.5 month girl with respiratory distress
18 Chest Radiographic Findings Suggestive of a Vascular Ring Right Aortic arch Descending Aorta on opposite side of arch Anterior bowing of trachea (lateral view)
19 6 month old with recurrent respiratory infections
20 Vascular Ring ESOPHAGRAM Not necessary if plain film suggests ring Confirms likely presence of ring May suggest type but not definitive
21 Imaging Vascular Rings CT Angiography Fast - decreased need for sedation.6mm-1mm axial spiral Timed/triggered dynamic IV contrast (2-3cc/Kg) 2 and 3-D reconstruction Pay attention to parameters and radiation dose Lower kvp (80-100) Automodulation of mas (ref mas 150) Breast shield in girls
22 Imaging Vascular Rings MR Imaging/Angiography Multiplanar capability/many sequence options. Need specific sequences to optimally evaluate airway Timed/triggered dynamic IV contrast for MRA 2 and 3-D reconstruction of images No ionizing radiation Long study/sedation often required
23 Vascular Ring combination of vascular/ ligamentous structures encircling the airway COMMON Double Aortic Arch Right arch, aberrant left subclavian artery + ductus UNCOMMON - Left arch, aberrant right subclavian artery + ductus - Right or left circumflex aorta and ductus aberrant subclavian artery - Mirror image right arch + ductus
24 Imaging Vascular Rings KEY FEATURES Arch location Branching of aorta Compression of airway Diverticulum of Kommerel Descending aorta
25 DOUBLE AORTIC ARCH DOUBLE AO ARCH WITH ATRETIC LEFT SEGMENT AA ANTERIOR AA C C S DA S DA POSTERIOR
26 DOUBLE AORTIC ARCH 4 symmetric vessels Bilateral Arches Ipsilateral carotid and subclavian Branches S c C S Compressed trachea
27 DOUBLE AORTIC ARCH L R R L Compressed airway Descending aorta on left
28 RIGHT ARCH ABERRANT LEFT SUBCLAVIAN ARTERY AA ANTERIOR DA DK
29 AAo T E DAo 2.5yo RAA ABERRANT LSCA BRANCH, Mild tracheal Compression, Diverticulum, Lt descending AO
30 LAA ABERRANT RSCA PLUS DIVERTICULUM
31 LAA ARSCA BRANCH Mild Tracheal Compression Diverticulum behind trachea ( prior TEF repair) Lt SVC
32 MIRROR IMAGE RIGHT ARCH RING AA ANTERIOR AA LT INNOM DA DA A
33 Mirror image right Arch Branching Mild tracheal Compression In Diverticulum Right descending aorta In
34 Mirror image Rt Arch Branching Mild tracheal Compression Diverticulum Circumflex aorta descending on left
35 Left Pulmonary Artery Sling Left pulmonary artery arises from RPA Courses posteriorly between the trachea and esophagus
36 Type I PA Sling Higher level of sling N bronchial branching or tracheal bronchus Associated compression/malacia (trachea/rmsb)
37 15yo girl with known VSD
38 15yo girl with known VSD
39 Type 1 PA sling
40 LPA Sling Chest Radiographic Findings May be normal Mass posterior to trachea on lateral view Unilateral hyperinflation (Type I) Bilateral hyperinflation or small right lung (Type II). Low T carina
41 Type II PA Sling ( Ring/Sling complex) Low position of PA sling Horizontal low carina Abnormal airway branching Associated long segment airway stenosis May be right lung hypoplasia/agenesis
42 5week old male with severe stridor
43 Newborn male with severe respiratory distress
44 Newborn male with severe respiratory distress 1 Type IIA LPAS 3 2
45 49 YO F PREVIOUS TOF REPAIR RIGHT DIAPHRAGMATIC PARALYSIS DECREASED EXERCISE TOLERANCE Previously unrecognized Type IIA PA sling and tracheal stenosis
46 Tracheal stenosis
47 LPA Sling Pre &Post
48 10 day old with tachypnea
49 10 day old with tachypnea
50 5 month old male with persistent respiratory symptoms
51
52 SUMMARY Vascular rings and slings are often first suspected on the basis of plain chest radiographs There is a wide spectrum of lesions and radiographic appearances Cross-sectional angiography provides the detailed anatomy needed for operative planning of vascular lesions compressing the airway Carefully evaluate and report vascular & airway appearance and relationships Multiple planes, 2D and 3D reconstructions are useful in understanding and communicating the important anatomy
53 References Vascular Ring/Pulmonary Artery Sling 1. Berdon WE. Rings, slings, and other things: Vascular compression of the infant trachea updated from the mid-century to the millennium the legacy of Robert E. Gross, MD, and Edward B.D. Neuhauser, MD. Radiology 2000; 216: Chan, MS, Chu WC, Cheung KL, Arifi AA, Lam WW. Angiography and dynamic airway evaluation with MDCT in the diagnosis of double aortic arch associated with tracheomalacia. AJR 2005; 185(5): Dodge-Khatami A, Tulevski II, Hitchcock JF, et al. Vascular rings and pulmonary arterial sling: from respiratory collapse to surgical cure, with emphasis on judicious imaging in the hi-tech era. Cardiol Young 2002; 12: Eichhorn J, Fink C, Delorme S, et al. Rings, slings and other vascular abnormalities. Ultra fast computed tomography and magnetic resonance angiography in pediatric cardiology. Z Kardiol 2004; 93:
54 References Vascular Rings (cont.) 5. Hernanz-Schulman M. Vascular rings: a practical approach to imaging diagnosis. Pediatric Radiology 2005; 35: Mahboubi S, Meyer JS, Hubbard AM, et al. Magnetic resonance imaging of airway obstruction resulting from vascular anomalies. International J of Pediatric Otorhinolaryngology 1994; 28: Dillman JR, Attili AK, Agarwal PP, Dorfman AL, Hernandez RJ, Strouse PJ. Common and uncommon vascular rings and slings: a multi-modality review Pediatr Radiol Nov;41(11): Newman B, Cho YA. Left Pulmonary Artery Sling-Anatomy and Imaging. Semin Ultrasound CT MR 2010; 31:
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