The University of Tennessee Graduate School of Medicine, Knoxville



The Department of Surgery

Mark A. Casillas, Jr., MD, FACS

Associate Professor
Division of General Surgery

Clinical Focus

Colon and Rectal Surgery; Neoplasms of the Colon, Rectum, and Anus; Inflammatory Bowel Disease; Benign Diseases of the Anorectum; Minimally Invasive Surgery; Robotic Colon and Rectal Surgery; Single Incision Laparoscopy; Transanal Endoscopic Microsurgery

Research Focus

Advances in Minimally Invasive Surgery
Advances in Robotic Colorectal Surgical Outcomes

Education

Graduate School
University of Alabama at Birmingham, Birmingham, AL

Medical School
University of Alabama School of Medicine, Birmingham, AL

Internship
General Surgery, Brown University Medical School, Providence, RI

Residency
General Surgery, St. Joseph Mercy Hospital, Ann Arbor, MI

Fellowship
Colon and Rectal Surgery, Indiana University School of Medicine, Indianapolis, IN

Certifications

American Board of Surgery
American Board of Colon and Rectal Surgery

Professional Affiliations

American Society of Colon and Rectal Surgeons, Fellow
American College of Surgeons, Fellow
Society of American Gastrointestinal and Endoscopic Surgeons

Current Publications

Landry M, Lewis R, Antill A, Heidel RE, Taylor J, Casillas MA Jr, Russ AJ, Daley B, Mcloughlin J.
Effect of enhanced recovery after surgery protocol implementation on cost and outcomes by type of colectomy performed. The American Surgeon. 2020 Aug 26:3134820943545. [Epub ahead of print]

Landry M, Cavalea AC, Bhat SG, Heidel RE, Casillas MA Jr, Russ AJ.
Combined endoscopic and laparoscopic surgery versus laparoscopic colectomy: Improved patient outcomes for endoscopically unresectable neoplasms. The American Surgeon. 2020 Mar 1;86(3):e164-e166.

Lee SG, Russ AJ, Casillas MA Jr.
Laparoscopic transanal minimally invasive surgery (L-TAMIS) versus robotic TAMIS (R-TAMIS): short-term outcomes and costs of a comparative study. Surgical Endoscopy. 2019 Jun;33(6):1981-1987. Epub 2018 Dec 13.

Johnson M, Casillas M Jr, Orucevic A.
Adenosquamous carcinoma of the anus: An uncommon malignancy presenting a treatment challenge. The American Surgeon. 2018 Jul 1;84(7):e248-e250.

Russ AJ, Casillas MA.
Gut microbiota and colorectal surgery: Impact on postoperative complications. Clinics in Colon and Rectal Surgery. 2016 Sep;29(3):253-7.

Current Presentations

Landry M, Lewis R, Antill AC, Heidel RE, Taylor JE, Casillas MA, Daley BJ, McLoughlin JM. Effect of enhanced recovery after surgery protocol implementation on cost and outcomes by type of colectomy performed. Presented at Southeastern Surgical Congress; 2020 Feb 8-11; New Orleans, LA.

Lee S, Landry M, Lodeiro G, Casillas M, Russ A. Single center experience and early adaptation of robotic and laparoscopic assisted Transanal Total Mesorectal Excision (TATME). Presented at Tennessee American College of Surgeons Annual Meeting; 2019 Aug 8-11; Chattanooga, TN.

Casillas M, Russ A, Abraham M, Johnson M, Lewis R, Whittington E, Landry M, Lodeiro G. Ligation of intersphincteric fistula tract with bioprosthetic mesh offers a promising relief for patients suffering from anal fistula: A review of LIFT outcomes data. Presented at American Society of Colon and Rectal Surgeons Annual Scientific Meeting; 2019 Jun 1-5; Cleveland, OH.

Lee S, Landry M, Casillas M, Russ A. Single center experience and early adaptation of robotic and laparoscopic assisted transanal total mesorectal excision (TATME). Presented at American Society of Colon and Rectal Surgeons Annual Scientific Meeting; 2019 Jun 1-5; Cleveland, OH.

Lee S, Russ A, Casillas M. Laparoscopic transanal minimally invasive surgery (L-tamis) vs robotic tamis (R-tamis): Short-term outcomes and costs of a prospective comparative study Presented at 16th World Congress of Endoscopic Surgery; 2018 Apr 11-14; Seattle, WA.

Johnson M, Casillas MA, Orucevic A. Adenosquamous carcinoma of the anus: An uncommon malignancy presenting a treatment challenge. Presented at Southeastern Surgical Congress; 2018 Feb 10-13; Tampa, FL.

Bhat S, Cavalea A, Alexander M, Casillas MA, Russ AJ. Combined endoscopic and laparoscopic surgery (CELS) offers improved patient outcomes versus Laparoscopic Colectomy (LC) for endoscopically unresectable Colorectal Neoplasms. Presented at American Society of Colon & Rectal Surgeons Tripartite Meeting; 2017 Jun 10-14; Seattle, WA.

Beierle SP, McLoughlin J, Heidel RE, Casillas M, Russ AJ. Colorectal cancer outcome disparities increase with distance from treating facility. Presented at Academic Surgical Congress; 2017 Feb 7-9; Las Vegas, NV.

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