A Case of Giant Subcutaneous Dermoid Cyst of the Right Shoulder

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  • KATANO Azusa
    Adventist Medical Center Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • UTSUMI Daisuke
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • OHIRA Aoi
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • KASUYA Yuriko
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • KARIYA Yoshiyuki
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • SAKIEDA Kaoru
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • MATORI Shigetaka
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • TAIRA Kiyohito
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • TAKAHASHI Kenzo
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus
  • UEZATO Hiroshi
    Department of Dermatology, Graduate School of Medicine, University of the Ryukyus

Bibliographic Information

Other Title
  • 右肩部に生じた巨大皮下皮様囊腫の1例
  • 症例 右肩部に生じた巨大皮下皮様囊腫の1例
  • ショウレイ ミギカタブ ニ ショウジタ キョダイ ヒカ ヒ ヨウノウ シュ ノ 1レイ

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Description

We describe a 16-year-old man suffering from a giant subcutaneous dermoid cyst. The patient presented a subcutaneous nodule on the right shoulder that he had had since birth, which gradually grew into a mass with the size of a chicken egg. The tumor could be removed easily from underling tissues and had fistula on the surface of the mass, from which several hair shafts projected. Contrast-enhanced computed tomography revealed a 86×44×67 mm well circumscribed low density unilocular cyst on the upper-dorsal aspect of the right scapula. The resected tumor displayed a fibrous connected tissue capsule that contained hair and atheromatous substance. A diagnosis of subcutaneous dermoid cyst was established based on the histopathological findings represented by a cyst lined by stratified squamous epithelium with hair follicles, sebaceous glands and smooth muscle. No recurrence had been observed for 20 months after the operation. Most subcutaneous dermoid cysts appear in the region of the head and neck, but rarely in other regions. Only 7 cases of subcutaneous dermoid cysts with diameters of more than 5 cm have been reported in Japan. Among these 7 cases, our case was the only one with the cyst observed in a region other than head and neck.

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