English Dictionary

Mongolian spot

名詞

A benign, flat, congenital, usually blue to blue-black birthmark in lower back with wavy borders and irregular shape, prevalent among East Asians, South-East Asians, Polynesians, Native Americans, East Africans, and the Turkish people. It normally disappears three to five years after birth and almost always by puberty.

日本語の意味

モンゴル斑：下背部に出現する良性の先天性色素斑で、通常は青色から青黒色を呈し、境界が波状で形が不規則なもの。東アジア、南東アジア、ポリネシア、先住アメリカ人、東アフリカ、トルコ人などに多く見られ、生後3～5年以内、ほとんどの場合は思春期までに消失する。

The pediatrician reassured the parents that the blue-gray patch on their newborn's lower back was a Mongolian spot, a benign flat congenital birthmark that typically fades by puberty.

小児科医は、新生児の下背部にある青灰色の斑点が蒙古斑であり、波状の縁を持つ扁平で先天的な良性のあざで、通常は出生後3〜5年で消え、思春期までにはほぼ消失することを両親に説明して安心させました。

意味（1）

A benign, flat, congenital, usually blue to blue-black birthmark in lower back with wavy borders and irregular shape, prevalent among East Asians, South-East Asians, Polynesians, Native Americans, East Africans, and the Turkish people. It normally disappears three to five years after birth and almost always by puberty.

Mongolian spots are produced by melanocyte leftovers that do not migrate into the epidermis; they remain deeper than usual in the lumbar-sacral region, resulting in blue coloration of the skin. Mongolian spots occur mainly on the buttocks and lower back, and occasionally on the abdomen, thighs, and arms. They occur in 90 percent of Blacks, 80 percent of Orientals and Native Americans, and 9 percent of Whites.

Mongolian spots （ plural ）