Useful classification of intussusception for preoperative 3D-MDCT images, type M or W: a case report and a novel classification.

A 67-year old male with intussusception due to sigmoid colonic caner was treated. For making correct classification of antegrade or retrograde type, multidetector-computed tomography in longitudinal views seemed optimal to demonstrate anatomical type. This radiological modality made to identify this instead of ultrasound sonography (US) could reveal details of surrounding information. Under intestinal obstruction due to intussusception, cancer-related information such as lymph nodal involvement could be visible using not US but MDCT because of air collection around lesions. His preoperative MDCT revealed antegrade type intussusception with cancerous mass at the leading point and no nodal involvements. Under general anesthesia, he has undertaken laparotomy to resect intussuscepted sigmoid colonic lesion successfully without delaying of surgical procedure. For correct preoperative identification of antero-retrograde type of intussusception using MDCT, safer surgical procedure could be provided. For these purposes, the authors classified these into 2 types, type M and W from longitudinal views of intussuscepted lesions using 3D-MDCT. This classification might be helpful for clinicians to diagnose type of intussusception and provide preoperative information of cancerous involvements with vessels and lymph nodal involvements to consider surgical option.