Computed tomography angiography aids in predicting resectability of isolated liver tumors in dogs.

Objective: To assess the accuracy of CT angiography (CTA) in predicting resectability, degree of surgical difficulty, and individual factors that may impact resectability of isolated hepatic masses in dogs.
Animals: Prospective study of 20 dogs with 21 isolated hepatic masses.
Procedures: All CTAs and surgeries were performed between June 16, 2013, and November 30, 2016, at The Animal Medical Center in New York. Preoperative CTA images were evaluated by a board-certified surgeon (n = 2). A preoperative assessment was completed, documenting several predetermined factors aimed at predicting resectability of each mass and the degree of surgical difficulty. Resectability was divided into gross resectability and complete histologic excision. Following surgery, the surgeon completed a postoperative assessment documenting the intraoperative findings. Independently, a blinded board-certified radiologist analyzed the images and completed an identical preoperative assessment.
Results: The radiologist was more accurate in lesion localization compared to the surgeon (P = .023). Seventeen (17/21) masses were grossly resectable in surgery. Two additional (2/21) masses that were deemed grossly resectable were incompletely excised on histopathologic analysis. Both the surgeon and radiologist were accurate in their prediction of gross resectability and complete excision. Major vascular involvement, multilobar involvement, and right-sided laterality negatively affected resectability. The surgeon was significantly more accurate in predicting the degree of surgical difficulty (κ = 0.50) when compared to the radiologist (κ = 0.38).
Clinical Relevance: Preoperative CTA of isolated hepatic masses is useful in prediction of surgical difficulty and resectability, as well as identifying several factors that impact resectability.