Here is an excellent article from the American Family Physician on primary non-retentive encopresis, where pant soiling may by an issue in children with no evidence of faecal compaction or constipation...
Treatment Guidelines for Primary Nonretentive Encopresis and Stool Toileting Refusal
BRETT R. KUHN, PH.D., BETHANY A. MARCUS, PH.D., and SHERYL L. PITNER, M.D., M.P.H. University of Nebraska Medical Center Omaha, NebraskaNonretentive encopresis refers to inappropriate soiling without evidence of fecal constipation and retention. This form of encopresis accounts for up to 20 percent of all cases. Characteristics include soiling accompanied by daily bowel movements that are normal in size and consistency.
technorati tags:primary non-retentive encopresis, encopresis, non-retentive encopreisis, potty training, toilet training, constipation