Solitary neurofibroma
（重定向自Plexiform neurofibroma）
A solitary neurofibroma (also known as a "Solitary nerve sheath tumor," and "Sporadic neurofibroma") may be 2 to 20mm in diameter, is soft, flaccid, and pinkish-white, and frequently this soft small tumor can be invaginated, as if through a ring in the skin by pressure with the finger, a maneuver called "button-holing."