CT abdomen and pelvis without contrast: Subcutaneous emphysema and extensive inflammatory stranding within the right ischiorectal fossa extending anteriorly and posteriorly involving the entire right perineum. The right-sided posterior subcutaneous air extends posteriorly and superior to the level of the gluteus muscle. The right-sided anterior collection extends superiorly and laterally to approximately the right ASIS. Additional pockets of air are appreciated within the left posterior rectal soft tissues and within the deep fascial tissues within the right lower pelvis.