Case report 63

Kimura’s disease involving the peripheral nerve of the arm in a child: a case report Kwang Soon Songa and Da Eun Woob A 7-year-old Korean boy was referred for a nontender mass in the left arm. He had a 5-year history of a poorly defined painless mass on the medial side of the left elbow. The ultrasonogram of the left arm indicated an ill-defined, lobulating solid mass involving the deep soft tissue layer. The fat-suppressed T2-weighted magnetic resonance image showed a poorly marginated, homogeneous highsignal intensity mass. On further follow-up of 1 year and 6 months, the mass showed no change in size and nature. At surgery, a poorly demarcated inflammatory mass was dissected from a branch of the superficial radial nerve and excised completely. There was no recurrence and any dysfunction, except temporary localized hypoesthesia of

Introduction Kimura’s disease is a rare inflammatory disorder of unknown cause, primarily seen in young Asian males. The disease is characterized by a triad of painless subcutaneous masses in the head or neck region, blood and tissue eosinophilia, and elevated serum immunoglobulin E (IgE) levels [1]. We could not find any report of Kimura’s disease involving the nerve of extremity in children, except for two reports in adults [2,3]. The characteristics of the Kimura disease in childhood have not been well described. We report a case of Kimura’s disease involving the medial brachial cutaneous nerve of the arm in a child.

Case report A 7-year-old Korean boy was referred for a nontender mass in the left arm. He had a 5-year history of a poorly defined painless mass. There were no overlying skin changes. On physical examination, the mass was located at the medial side of the left elbow. It was movable and nontender. The overlying skin was unremarkable (Fig. 1). He experienced no alteration in the sensory and motor function of the left arm. Laboratory tests indicated peripheral eosinophilia of 29.8% (normal range: 0–7%). The serum IgE level was not determined. The ultrasonogram of the left arm indicated an ill-defined, lobulating solid mass involving the deep soft tissue layer. The fat-suppressed T2-weighted magnetic resonance image showed a poorly marginated, homogeneous high-signal intensity mass located in the subcutaneous fat layer proximal of the medial epicondyle (Fig. 2). With intravenous gadolinium enhancement, the mass was enhanced strongly and homogeneously. Perilesional edema and inflammatory change were 1060-152X © 2014 Wolters Kluwer Health | Lippincott Williams & Wilkins

the medial aspect of the left arm at the 3.6-year followup. J Pediatr Orthop B 24:63–66 © 2014 Wolters Kluwer Health | Lippincott Williams & Wilkins. Journal of Pediatric Orthopaedics B 2015, 24:63–66 Keywords: child, Kimura’s disease, nerve a Department of Orthopedic Surgery, Dongsan Medical Center, School of Medicine, Keimyung University and bDepartment of Pediatrics, School of Medicine, Yeungnam University, Korea

Correspondence to Kwang Soon Song, MD, PhD, Department of Orthopedic Surgery, School of Medicine, Dongsan Medical Center, Keimyung University, 56 Dalsungro, Jung-gu, Daegu 700-712, Korea Tel: + 82 53 250 7250; fax: + 82 53 250 7205; e-mails: [email protected] and [email protected]

observed. Needle biopsy for the mass was performed and the diagnosis of Kimura’s disease was established. On further follow-up of 1 year and 6 months, the mass showed no change in size and nature. At surgery, a poorly demarcated inflammatory mass was dissected from a branch of the superficial radial nerve and excised completely. On gross examination, a poorly demarcated mass was found that measured 7.5 × 3.0 × 2.7 cm in size (Fig. 3). The cutting surface of the mass was solid, slightly nodular, and pale pink to tan in color. No necrosis or hemorrhage was observed in the removed mass (Fig. 4). On microscopic examination, the mass was composed of numerous lymphoid follicles of variable sizes with germinal centers and infiltration of intervening inflammatory cells and associated with proliferation of blood vessels. Focal fibrosis was also observed. The intervening inflammatory cells were composed of mostly eosinophils and occasional lymphocytes and plasma cells. Fascicles of nerve bundles with perineurium were scattered within the mass (Figs 5 and 6). At the 3.5-year follow-up, there was no recurrence and any dysfunction, except temporary localized hypoesthesia of the medial aspect of the left arm.

Discussion Kimura disease is a chronic inflammatory disease, which frequently affects middle-aged Asian men, although children are seldom affected by it. Therefore, the characteristics of the Kimura disease of childhood have not been well described [3,4]. The cause of Kimura’s disease is unknown and many theories have been proposed [4–7]. The disease is characterized by a triad of painless subcutaneous masses in the head or neck region, blood and tissue eosinophilia, and markedly elevated serum DOI: 10.1097/BPB.0000000000000114

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64 Journal of Pediatric Orthopaedics B 2015, Vol 24 No 1

IgE levels [1]. Kimura’s disease typically occurs in the head and neck region, but cases involving the limbs, trunk, scalp, and groin have been reported [2,8]. Two cases of Kimura’s disease involving the median nerve have been reported [2,3], but to our knowledge, there has been no similar case of Kimura’s disease involving a purely sensory nerve in a child. Kimura’s disease should be considered as a possible diagnosis when a partially or a poorly defined subcutaneous mass of high-signal intensity on T1-weighted and T2-weighted images with homogeneous enhancement, surrounding subcutaneous edema, and internal flow voids is seen in the medial epitrochlear region in an Asian individual, especially if accompanied by peripheral

eosinophilia [9]. Ultrasound scanning and MRI, used in combination, are the most effective imaging techniques, but may not differentiate Kimura’s disease from malignant tumors [3]. The diagnosis was made on the basis of the characteristic histopathologic findings after surgical excision in conjunction with peripheral eosinophilia [1]. The differential diagnosis is broad [3,6,7,10]. The main condition with which Kimura’s disease can and has been confused histologically is angiolymphoid hyperplasia with

Fig. 3

Fig. 1

The mass was located at the medial side of right distal humerus above the elbow. It was movable and nontender. The overlying skin was unremarkable.

Poorly demarcated mass was found that measured 7.5 × 3.0 × 2.7 cm in size.

Fig. 2

The fat-suppressed T2-weighted magnetic resonance image shows a poorly marginated, homogeneous high-signal intensity mass located in the subcutaneous fat layer proximal of the medial epicondyle.

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Kimura’s disease involving nerve in children Song and Woo 65

eosinophilia (ALHE), which itself most often involves the head and neck region and which has now been determined to be a separate condition [3].

Fig. 4

No cases of ALHE affecting a nerve have been described, but a case of Kimura’s disease, the lesions of which have repeatedly been confused with ALHE, has been reported involving the median nerve in an adult [10]. Several reports have described the modalities of treatment [2,4,5,11–19]. Complete surgical resection is the main form of treatment and the best modality of treatment [3,4,8]. Although Kimura’s disease is a rare chronic inflammatory disorder with a high rate of recurrence [4,8,11,19,20], Fig. 6

The cutting surface of the mass showed solid and nodular shape. No necrosis or hemorrhage was observed in the removed mass.

The mass consists of inflammatory infiltrates and hyperplastic lymphoid follicles (black solid arrow) with entrapped nerve fascicles (empty arrow) (H&E, × 20).

Fig. 5

A nerve fascicle (solid black arrow) is surrounded by Kimura’s disease (H&E, × 100) (a). The mass shows proliferation of blood vessels (solid black arrow) and dense infiltration of inflammatory cells, especially eosinophils (arrow head) (H&E, × 400) (b).

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66 Journal of Pediatric Orthopaedics B 2015, Vol 24 No 1

fortunately, there was no recurrence or dysfunction on our case at the 3.5-year follow-up.

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Acknowledgements Conflicts of interest

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There are no conflicts of interest. 13

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Kimura's disease involving the peripheral nerve of the arm in a child: a case report.

A 7-year-old Korean boy was referred for a nontender mass in the left arm. He had a 5-year history of a poorly defined painless mass on the medial sid...
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