True about Richter's hernia

In Richter's hernia, only pa of the bowel wall enters the hernia. Bowel obstruction may not be present but the bowel wall may still become necrotic and perforate.In sliding hernia, viscus forms the wall of the herniaIn Littre's hernia, Meckel's diveiculum is the content.In Amyand's hernia, appendix is the content.Ref: Bailey and love 27e pg: 1024