College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
The colorectum can be a difficult anatomic region to image and each of the commonly utilized imaging modalities such as radiography, ultrasound, and colonoscopy has limitations. CT pneumocolonography (CTP) is a noninvasive, quick, and accurate method in detecting large colorectal lesions. Additionally, it enables clinicians to identify the characteristics of lesions and to determine the stage of tumor on the basis of extracolonic findings.
The purpose of the present study is to raise awareness of the usefulness of CTP in evaluating colonic mass in dogs.
A 10-year-old Spitz was presented with a history of chronic hematochezia and increased defecation over 6 months. Ultrasonography revealed a heterogeneous focal mass at the descending colon. And CT pneumocolonography was performed using specific contrast administration protocols. After 27 days, the patient underwent partial colectomy and lymphadenectomy and tissue samples were histopathologically examined.
On pre- and post-contrast CT images of the abdomen, an irregular shaped heterogeneous mass with its length 4.78 cm in the descending colon was detected and intestinal adenocarcinoma was confirmed by histopathological exams.
CTP is a feasible technique to visualize large colorectal lesions and to determine the accurate location and infiltrative degree of colorectal mass. It could also be utilized as a precise measurement tool for the distance from the anus to the lesions. These features support the use of CTP as an alternative screening option for colorectal lesions.