Oral leukoplakia

Japanese: 口腔白板症 - こうこうはくばんしょう(英語表記)oral leukoplakia
Oral leukoplakia
Medically, it is called oral mucosa. It is a keratotic white spot that occurs on the oral mucosa. The WHO Committee on Precancerous Conditions of the Oral Cavity (1967) defined it as a white spot that cannot be removed by scraping and cannot be classified as another diagnosable disease. It occurs anywhere in the oral cavity, but is most common on the gums, buccal mucosa, and tongue. It is more common in men than women, and the majority of cases are over 40 years old. The color, shape, and spread vary, and some are white, pearly, grayish white, and even erythematous. The surrounding border may be clear or unclear, and the surface may be smooth or raised, rough, wrinkled, pavement-like, papillary, or warty.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
医学的には〈こうくうはくばんしょう〉という。口腔粘膜に生ずる角化性白斑性病変で,WHO口腔前癌状態に関する調査委員会(1967)では,擦過によっても除去できない白斑で,他の診断可能な疾患に分類できないものと定義されている。口腔全域に生ずるが,歯肉,頰粘膜,舌に多い。男性は女性より多く,40歳以上が大半を占めている。色調,形,広がり方はさまざまで,白色,真珠色,灰白色,さらに紅斑を交えるものもあり,周囲の境界が鮮明なものや不鮮明なもの,表面は平滑であったり隆起し,粗造,しわ状,敷石状,乳頭状ないしいぼ状のものなどがある。

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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