Zita Medical Management 0000 Zita Medical Management2529-05682654-1629 Zita Medical Management http://dx.doi.org/10.36162/hjr.v3i2.157 Research Article Parsonage Turner syndrome; MR imaging/diagnosis Winging scapula in a young athletic maleWinging scapula in a young athletic male Terezaki Foteini Department of Radiology, University of Crete, Department of Medical Imaging, University Hospital, Heraklion, Greece Savva Εirini D. Department of Radiology, University of Crete, Department of Medical Imaging, University Hospital, Heraklion, Greece April 2017 1 April 2017 3 2 © 2017 Upon acceptance of an article for publication in Hellenic Journal of Radiology, authors transfer copyright to the Hellenic Radiological Society but they retain the intellectual property rights including research data. 2017

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 Winging scapula in a young athletic male

A 17-year-old male patient, elite track athlete, presented with a winging scapula (Fig. 1). His past medical history revealed a right arm pain lasting for a period of two weeks, two months before presentation. Clinical findings included slight impairment of biceps and right brachioradialis reflexes, as well as right serratus muscle weakness. An electromyography study (EMG) was performed. Axial STIR (Fig. 2), axial T1W (Fig. 3) and coronal STIR (Fig. 4) magnetic resonance (MR) images are shown.

PART A

A 17-year-old male patient, elite track athlete, pre­sented with a winging scapula (Fig. 1). His past med­ical history revealed a right arm pain lasting for a period of two weeks, two months before presenta­tion. Clinical findings included slight impairment of biceps and right brachioradialis reflexes, as well as right serratus muscle weakness. An electromyogra­phy study (EMG) was performed. Axial STIR (Fig. 2), axial T1W (Fig. 3) and coronal STIR (Fig. 4) magnetic resonance (MR) images are shown.

 Figure 1

Fig. 1: The patient at clinical examination

 Figure 2

Fig. 2: Axial consecutive STIR MR images

 Figure 3

Fig. 3: Axial T1W MR image

 Figure 4

Fig. 4: Coronal consecutive STIR MR images

 PART B

PART B

Diagnosis: Parsonage Turner syndrome

Winging scapula is defined as the wing-like appear­ance of the medial scapular border and may result from various pathologies related to long thorac­ic nerve injury and serratus anterior muscle paresis (Fig. 1) [1].In our patient there was no history of pre­vious trauma. The EMG showed acute denervation of muscles, a finding which is consistent with Parsonage Turner syndrome (PTs). The muscles involved were the anterior serratus and trapezius, innervated by the long thoracic and spinal accessory nerves respective­ly. MR images showed accordingly the muscular oede­ma (Figs. 2-4).PTs, also known as neuralgic amyotrophy or branchial plexus neuritis, is a rare, self limited disor­der of the branchial plexus [2], which usually affects the long thoracic, axillary, radial or phrenic nerves [3]. PTs diagnosis requires previous exclusion of a bra­chial plexus lesion. It is characterised by the inflam­mation of the nerves that innervate the muscles of the chest, shoulders and arms [2]. Its cause is not well de­fined but viral and immunological patterns are sug­gested [3]. This syndrome may appear in two differ­ent forms, idiopathic or hereditary [4]. The aetiology of the idiopathic pattern remains unclear [2] and an immune cause has been suggested [4]. Multiple ante­cedent events such as viral infection, trauma, strenu­ous exercise and surgery may trigger an immune-me­diated syndrome [4, 5]. As far as the hereditary pattern is concerned, it is an autosomal-dominant recurrent neuropathy of the branchial plexus due to defects in a septin family gene. Mutations in the gene septin 9 on chromosome 17q23 are detected in families with he­reditary form of the syndrome [4]. The overall inci­dence is about 1.64 per 100,000, usually affecting peo­ple between 30 and 70 years and mainly men [5], with ratios ranging from 2:1 to 11.5:1 [6]. It was believed that the long thoracic nerve was the nerve mainly af­fected in PTs, but later reports have shown a high­er incidence of isolated suprascapular nerve involve­ment. Furthermore, the axillary, radial and phrenic nerves or even the entire branchial plexus may be af­fected [3]. This syndrome appears bilaterally in up to one third of the patients [5].

Clinically, PTs presents with acute, severe neuro­genic pain in the shoulder or arm lasting for days or weeks. Pain is often unrelenting; it worsens with shoulder movements and can also worsen at night, awaking patients from sleep [4, 7]. It is often described as constant, sharp, stabbing, throbbing, or aching pain. Characteristically it is located in the shoulder and often radiates into the arm or neck, commonly ag­gravated by movement of the shoulder but not typi­cally by movement of the neck or Valsalva maneuvers [7]. Pain is usually followed by muscle weakness, at­rophy, paraesthesia and hypoaesthesia. Muscle weak­ness typically begins to develop days to weeks after the onset of pain and often worsens as the pain sub­sides [4, 7]. The initial pain location does not necessar­ily correlate to the muscle weakness distribution and does not always correlate with a single nerve root dis­tribution. Multiple muscles may be involved which do not coincide with a single or specific nerve affliction. Upper brachial plexus involvement is the most com­mon pattern [4]. Atrophy of the involved muscles usu­ally occurs relatively quickly [7]. Hypoaesthesia and paraesthesia are the most commonly described sen­sory symptoms and the sensory loss is often patchy in distribution, corresponding to the sites of plexus or nerve involvement [4]. Autonomic symptoms have rarely been described, including trophic skin chang­es, oedema in the involved extremity, temperature dysregulation, changes in nail or hair growth and in­creased sweating [4, 7].

The diagnosis of PTs is mainly clinical but no specif­ic tests exist. Therefore, as PTs could be confused with other diseases, such as neoplastic plexopathy, imag­ing is required for accurate diagnosis, which will guide proper treatment. There is no surgical treatment for PTs. Analgesics and/or non-steroidal anti-inflammato­ry drugs along with physiotherapy usually result in full recovery within three years with a low percentage of relapse. Imaging is important in order to exclude com­mon disorders, such as denervation from ganglion cysts or other mass-like lesions [4]. MR imaging is the meth­od of choice, by revealing, on fluid-sensitive sequenc­es, diffusely increased signal in various muscles in the early stages. Inchronic disease, atrophy, demonstratedwith reduction in muscle bulk and increased T1 signal due to fatty infiltration are shown. Intramuscular sig­nal may return to normal several months after symp­tom onset but cases with atrophy and fatty infiltration correspond to irreversible changes [4]. EMG testing is also useful, revealing acute denervation in various mus­cles [3]. In our patient, full recovery was observed on the three-months clinical follow up and thus there was no need for further imaging.

Conflict of interest

The authors declared no conflicts of interest. Figure 1

Fig. 1: Winging scapula is the protrusion of the medial border of the scapula from the tho­rax (arrows).

 Figure 2

Fig. 2: Axial consecutive STIR MR images show oedema and mild swelling of the right serratus anterior muscle (arrows).

 Figure 3

Fig. 3: Axial T1W MR image does not show any atrophy or fatty infiltration of the anterior serratus muscle (arrow).

 Figure 4

Fig. 4: Coronal consecutive STIR MR images show oedema and mild swelling of the right serratus anterior muscle (open ar­rows) and of the right trapezius muscle (arrows).

 Refrences

1. Gooding BW, Geoghegan JM, Wallace WA, et al. Scap­ular winging. Shoulder Elbow 2014; 6(1): 4-11.

2. Zara G, Gasparotti R, Manara R. MR imaging of pe­ripheral nervous system involvement: Parson­age-Turner Syndrome. J Neurol Sci 2012; 315(1-2): 170-171.

3. Bencardino JT, Rosenberg ZS. Entrapment neuropa­thies of the shoulder and elbow in the athlete. Clin Sports Med 2006; 25(3): 465-487.

4. Stutz CM. Neuralgic amyotrophy: Parsonage-Turn­er syndrome. J Hand Surg Am 2010; 35(12): 2104-2106.

5. Yanny S, Toms AP. MR patterns of denervation around the shoulder. AJR Am J Roentgenol 2010; 195(2): W157-163.

6. Scalf RE, Wenger DE, Frick MA, et al. MRI findings of 26 patients with Parsonage-Turner syndrome. AJR Am J Roentgenol 2007; 189(1): W39-44.

7. Smith CC, Bevelaqua AC. Challenging pain syn­dromes: Parsonage-Turner syndrome. Phys Med Re­habil Clin N Am 2014; 25(2): 265-277.

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