Well, first of all I don't think it's an "organ". I am trying to find out a type of medical condition, I have attached a picture of some sketch drawings of what I think the "organ" looks like on the right and then on the left roughly where it is located (either in one of two of the locations), there is only one I think of these and it's in a male 16 year old body. The medical condition to do with this can be treated with an operation when young but it doesn't affect you until you're older and people can die from this. They have known they've had the condition since birth and the name of the "organ" is quite common, although not too many people have heard of it.
Can anyone tell me what this thing/organ is called and perhaps what medical conditions it could have? dans condition.jpg