Can a pilonidal cyst be a vanishing twin?

Pilonidal: The answer is no, no relationship at all to a vanishing twin.

???: Not sure I understand the question. Are you asking Can it resolve without surgery ?? I guess it could but this would be the exception. Most will not get better until they are excised. But sometimes they are quiescent and can remain there for years without causing pain or problems. In that case you would not need to remove it