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Scientific Session

Oncology

The Importance of Surgical versus Histologic Margins

Saturday, June 25, 2022

8:00 AM – 10:10 AM CT

Location: ACC Ballroom B

CE: 2

Primary Presenter(s)

Julius M. Liptak, BVSc, MVetClinStud, FANZCVSc, DACVS-SA, DECVS, ACVS Fellow in Surgical Oncology, ACVS Fellow in Oral and Maxillofacial Surgery, RCVS Specialist in Surgical Oncology

Specialist Small Animal Surgeon
Capital City Small Animal Mobile Surgery
Ottawa, Ontario, Canada

Slides

Co-Presenter(s)

Dan Linden, DVM, MS, DACVS, ACVS Fellow, Surgical Oncology

Staff Surgeon
First Coast Vet Specialists
Jacksonville, Florida, United States
Barbara Powers, DVM, PhD, DACVP

Pathologist
Vidium Animal Health
Bellvue, Colorado, United States
Derick Whitley, DVM, DACVP

Vice President of Strategy, Innovation, and Diagnostics
Vidium Animal Health
Stillwater, Oklahoma, United States

The terminology used for describing margins in veterinary oncology can be confusing. The two relevant descriptors of oncologic margins are surgical resection margins and histologic margins. Surgical resection margins are the margins of grossly normal adjacent tissue used to resect a tumor, whereas histologic margins describe how close the tumor extends microscopically to the surgical resection margins. The histologic margins are further complicated by the impact of specimen shrinkage and the widespread, but inappropriate, use of terminology such as narrow or close margins. The controversies surrounding histologic margins and its relevance to local tumor recurrence will be discussed, and the Residual Tumor Classification scheme, which has been used for over 40 years in human surgical oncology, will be introduced.

Learning Objectives:

Knowledge of: - Surgical margins - Histologic margins - Residual tumor classification scheme