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Arterial Thoracic Outlet Syndrome - A Rare Entity | OMICS International
ISSN: 2329-6895
Journal of Neurological Disorders
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Arterial Thoracic Outlet Syndrome - A Rare Entity

Rajul Rastogi1*, Shourya Sharma1, Ankita Singhal1,2, Prabhat Kumar Bhagat1, Yuktika Gupta1, Pankaj Kumar Das1, Mohini Choudhary1 and Vijai Pratap1

1Department of Radiodiagnosis, Teerthanker Mahaveer Medical College and Research Center, Moradabad, UP, India

2Consultant Neurophysician, Moradabad, UP, India

*Corresponding Author:
Rajul Rastogi
Teerthanker, Mahaveer Medical College and Research Center
Moradabad, U.P, India
Tel: 919319942162
E-mail: [email protected]

Received Date: November 24, 2016; Accepted Date: November 28, 2016; Published Date: November 30, 2016

Citation: Rastogi R (2016) Arterial Thoracic Outlet Syndrome – A Rare Entity. J Neurol Disord 4:320. doi: 10.4172/2329-6895.1000320

Copyright: © 2016 Rastogi R. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Abstract

Thoracic outlet syndrome refers to a constellation of neurovascular signs and symptoms caused by compression of neural and vascular structures as they exit through the superior thoracic aperture to enter the upper limb. Arterial type is the rarest and requires early diagnosis and management to prevent severe complications like thromboembolic phenomenon. Hence, in this article, we are describing thoracic outlet syndrome arising due to compression of right subclavian artery that was well diagnosed by imaging.

Keywords

Arterial; Thoracic; Outlet; Color-Doppler

Case report

A 35-year old male with 2-3 months’ history of numbness and paresthesia in right upper limb following an overhead smash-shot during badminton play came to our department for Computed Tomography Angiography (CTA). Though clinical examination revealed feeble radial pulse ipsilaterally yet there was no discoloration of skin and other signs of ischemia. All routine laboratory tests were unremarkable.

neurological-disorders-nonvisualised-portion

Figure 1: CTA VRT image showing nonvisualised portion of distal right SCA (large arrow) with normal appearing right axillary and brachial arteries and bilateral cervical ribs arising from C7 vertebrae (thin small arrows).

neurological-disorders-coronal-plane

Figure 2: CTA MIP image in coronal plane shows nonvisualised portion of distal right SCA (large arrow) with narrowing of costoclavicular space on right side relative to left side (thin small arrows).

neurological-disorders-Color-Doppler

Figure 3: Color Doppler US image with overhead abduction of arm shows nonvisualised distal right SCA (arrow).

neurological-disorders-Power-Doppler

Figure 4: Power Doppler US image in adducted arm position shows narrow segment of distal right SCA corresponding to the nonvisualised segment in figure 3 (in between the arrows).

CTA revealed nonvisualisation of short-segment of distal part of right subclavian artery in the region of thoracic outlet associated with narrowing of ipsilateral costoclavicular space caused by synostosis of cervical rib arising from C7 vertebra with first dorsal rib (Figures 1 and 2). No evidence of any obvious post-stenotic dilation or collateral channels or space occupying lesion was noted. Axillary and rest of the arteries of right upper limb were normally visualised but were slightly less in caliber relative to contralateral side.

As patient head no clinical signs of ischemic changes, he was then taken up for Color Doppler Imaging (CDI) for getting more information about the nonvisualised segment of right subclavian artery. CDI revealed luminal narrowing of the corresponding nonvisualised segment of right subclavian artery; being more marked in overhead position of the right arm (Figures 3 and 4). This made us realise that the nonvisualisation of subclavian artery on CTA was secondary to the overhead position of right arm.

Based on the above radiological findings, the diagnosis of arterial thoracic outlet syndrome (ATOS) secondary to costoclavicular space stenosis was made.

Discussion

Thoracic outlet syndrome (TOS) is a clinical entity characterised by signs and symptoms arising secondary to compression of brachial plexus or subclavian vein or subclavian artery (SCA) as they exit from superior thoracic aperture to enter the upper limb. It may be congenital or acquired and may present with neural or vascular symptoms or combination of both [1]. Thoracic outlet extends from the cervical spine and mediastinum to the lower border of pectoralis minor muscle. The syndrome is four times commoner in females than males and is seen between 3rd to 5th decades [1].

The three common locations of compression of neurovascular bundle of the upper limb at the thoracic outlet include scalene triangle (space between scalenus anterior and medius muscles); costoclavicular space (space between coracoid process and clavicle) and retro or subpectoral space (space between pectoralis minor muscle and coracoid process).

Commonest etiology of TOS is scalenus anticus syndrome characterised by abnormal insertion of scalenus anterior muscle on 1st rib followed by cervical rib; abnormalities of 1st rib or clavicle (1st rib uniting with another rib instead of sternum, malunited fracture, abnormal callus following fracture, Paget’s disease, tumors like exostosis); abnormally large C7 vertebral transverse process (tip of C7 transverse process extending beyond the limits of D1 transverse process); muscular hypertrophy; supraclavicular adenopathy, etc. [1-3].

Neurogenic type of TOS is commonest (more than 90%) while arterial type is rarest (1% to 3%) with former presenting with pain, paresthesia and numbness of upper limb [2]. Venous type is commonly associated with thrombosis of subclavian vein presenting with pain and swelling of upper limb while arterial type is characterised by signs of ischemia like coolness, pallor, claudication, paresthesia and reduced upper limb pulses. Our case is unique in the fact that he presentation occurred for the first time in 4th decade by an identifiable precipitating factor similar to one described by Esposito et al. in a ball thrower [4]. Probably the overhead smash shot during badminton play caused movement at the abnormal union between the cervical and first dorsal ribs resulting in narrowing of right costoclavicular space below a critical level sufficient to cause symptoms.

Imaging in adducted and abducted position of arm (latter above the level of head) using CDI, CT, magnetic resonance imaging (MRI) or angiography can be variably useful depending upon the clinical setting [1-5]. CDI is primarily useful in venous and arterial type of TOS and has the advantage of being dynamic, less time-consuming, noninvasive and radiation-free. CT scan is primarily useful in vascular type of TOS as it can be combined with angiography and provides information about the etiology especially bony pathology but has the disadvantage of radiation exposure and contrast-related side effects. MRI is useful in both neural and vascular type of TOS as it can be combined with angiography and provides nearly all the information needed and also has the advantage of being noninvasive, radiation-free and reproducible but has the disadvantage of being expensive and more time-consuming [6]. Thus, MRI is the single stop-shop for imaging of TOS.

Imaging in ATOS may reveal transient stenosis on overhead abduction of arm or fixed stenosis of SCA at the site of dynamic compression caused by osseous or soft tissue abnormalities with or without associated complications like thrombosis; distal embolism; collaterals and /or aneurysm/pseudoaneurysm of SCA.

Management of ATOS is primarily surgical excision of cervical and 1st dorsal rib to prevent as well as treat thromboembolic phenomena. In acute cases, endovascular removal of clot may be needed to prevent complications.

Conclusion

Imaging plays a key role in diagnosis and management of TOS with CDI and CTA being complimentary to each other in vascular type while MRI being not only the gold standard imaging technique in neurogenic type but is also a single-stop shop for all cases with suspected TOS. Hence, knowledge of imaging features is a key to early diagnosis.

References

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