Pilonidal sinus

Japanese: 毛巣洞 - もうそうどう（英語表記）pilonidal sinus

Also called pilonidal fistula. A chronic, purulent-draining sinus that occurs subcutaneously in the sacrococcygeal region of the lower back. Although congenital cases are known, it is usually acquired and is thought to occur when hair is pushed subcutaneously by friction or pressure, forming a cyst-like shape. Congenital causes are rare, at about 10%. The male-female ratio is 3:1, and it is more common in men and in hairy people. It is more common in Caucasians, but less common in Asians and blacks. It is also called jeep disease because it was common among military personnel who often drove jeeps.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

毛髪洞，毛巣瘻（ろう）pilonidal fistulaともいう。腰の仙尾骨部の皮下に生じる慢性の排膿性の洞をいう。先天的なものも知られるが，通常は後天性で，摩擦や圧迫などによって毛髪が皮下に押し込まれ，囊胞のような形となって生じるものと考えられている。先天性の要因は約10％と少ない。男女比は3対1で男性に多く，毛深い人に多い。白人に多いが，東洋人や黒人には少ない。ジープによく乗る軍人に多発したことからジープ病jeep diseaseとも呼ばれる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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