1. Horattas E, Horattas M, Parker M: What to do with Giant Juvenile Fibroadenoma of the Breast? 31st Miami Breast Cancer Conference. Miami, Florida. March 6, 2014.

2. Lanzinger W, Horattas M, et al: Retrospective Study Comparing the Use of the Harmonic Scalpel versus Conventional Knot Tying or Clipping for Vessel Ligation in Thyroid Surgery. American College of Surgeons Annual Clinical Congress. Chicago, Illinois. October 11-15, 2009.

3. Horattas M: Surgery Visiting Professorship – Blackfeet Indian Hospital (Volunteer service and laparoscopic surgical update for Indian Health Services). Browning, Montana. August 2008.

4. Horattas M: Surgery Visiting Professorship – Blackfeet Indian Hospital (Volunteer service and general surgical update for Indian Health Services). Browning, Montana. August 2007.

5. Lanzinger W, Horattas M: The Harmonic Scalpel versus Conventional Knot-Tying in Thyroid and Parathyroid Surgery - A Comparison of Safety, Operating Time and Cost-Effectiveness. Crile symposium Cleveland Clinic Foundation. Cleveland, Ohio. October 27-28, 2006.

6. Paranjape C, Horattas M: Changing Concepts in Appendicitis in the Elderly. American College of Surgeons Annual Clinical Congress. Chicago, Illinois. October 8-12, 2006.

7. Paranjape C, Salvator A, Horattas M. Appendicitis in the Elderly – A Change in the Laparoscopic Era. 2006 SAGES Scientific Session April 26-29, 2006 Dallas, TX.

8. Horattas M. Surgery Visiting Professorship – Tirana, Albania. Medical missions volunteer service trips and invited surgical instruction. July 2002 and also in June 2004.

9. Horattas M, Cosentino-Chalfant C, Sheehan K. Stereotactic Breast Biopsy: Confirming the Adequacy with Air Contrast. American College of Surgeons Annual Clinical Congress. San Francisco, California. October 6-10, 2002.

10. Horattas M. Stereotactic Breast Biopsy – A Simple Air Contrast Modification to Ensure an Adequate Biopsy. Miami Breast Cancer Conference. Miami, Florida. February 27, 2002

11. Horattas M, Evans S, Lee C, Tandoh M. Does Preoperative Vioxx (Rofecoxib) Improve the Immediate Postoperative Course in Patients Undergoing Laparoscopic Cholecystectomy? American College of Surgeons Annual Clinical Congress. New Orleans, Louisiana. October 8-11, 2001.

12. Horattas M. Parathyroid Cancer. American Association of Endocrine Surgeons Annual Meeting. Atlanta, Georgia. April 29 – May 1, 2001.

13. Storm-Dickerson T, Horattas M. Appendicitis in the Elderly-What Have We Learned over the Past Twenty Years? American College of Surgeons Clinical Congress. Chicago, Illinois. October 22-27, 2000.

14. Chandawarkar R, Kovalchin J, Horattas M, Guyton D: Primary and Postoperative Adjuvant Immunotherapy of Cancer Using Tumor Derived Heat Shock Proteins. American Association for Cancer Research. San Francisco, California. April 1-5, 2000.

15. Horattas M, Chandawarkar R, Murray M, Comar K: Stereotactic Breast Biopsy-How Can We Do It Better? 5th Annual Multidisciplinary Symposium on Breast Disease. Rome, Italy. February 13-16, 2000.

16. Horattas M, Chandawarkar R, Murray M, Comar K, Rotkis M. Stereotactic Breast Biopsy: Mammographic Follow-up on 104 Patients with Initially Benign Histology. American College of Surgeons Clinical Congress. San Francisco, California. October 10-15, 1999

17. Horattas M, Hopkins S, Haller N, Sloan-Stakleff K, Montgomery M: Is Increased Bacterial Translocation Related to Type of Gas or Insufflation Pressure? Society American Gastrointestinal Endoscopic Surgeons. San Antonio, Texas. March 24-27, 1999.

18. Horattas M, Pasini D, Hopkins S, Martino C, Trupiano J, Murty A: Changing Concepts in Long Term Venous Access. Association of the Society of Parenteral and Enteral Nutrition, 23rd Congress of ASPEN. San Diego, California. January 31-February 3, 1999.

19. Chandawarkar R, Kovalchin J, Murthy A, Horattas M, Guyton D: Customized Immunotherapy of Cancer Using Heat Shock Proteins. Society of University Surgeons Meeting. New Orleans, Louisiana. February 1999.

20. Horattas M, Evasovich M: What is the Significance of Peritoneal Cytology in Colorectal Carcinoma? International Society of Predictive Oncology. Nice, France, October 24-27, 1998.

21. Horattas M, Hopkins S, Martino C, Trupiano J, Murty A, Pasini D: Changing Concepts in Long Term Venous Access. American College of Surgeons Clinical Congress. Orlando, Florida. October 1998.

22. Chandawarkar R, Kovalchin J, Murthy A, Horattas M, Guyton D: Optimizing Immunotherapy of Solid Primary Tumors Using Tumor Derived Heat Shock Protein gp96. International Conference on Heat Shock Protein Immune Regulation. Farmington, Connecticut. October 1998.

23. Horattas M, Evasovich M, Hopkins S, Muakkassa F: Increased Postoperative Vasopressin Activity Controlled by Demeclocycline. Presented at the American College of Surgeons Clinical Congress. Chicago, Illinois. October 13-16, 1997.

24. Horattas M, Guyton D, Fenton A, Jaroch M, Ruf W, Scarcella R, Evasovich M: Colorectal Carcinoma and the Relationship of Peritoneal Cytology. Presented at the American College of Surgeons Clinical Congress 1996. San Francisco, California. October 8-11, 1996.

25. Horattas M: Management of Mid and Low Rectal Carcinoma Current Options and Future Directions. Presented at the Ohio Chapter American College of Surgeons 1995 Annual Meeting. Cuyahoga Falls, Ohio, May 4-6, 1995.

26. Horattas M: Management of the Trauma Patient. Presented at Northeastern Ohio Sports Medicine Institute. March 14, 1995.

27. Clark T, Horattas M: The Effect of CO2 Pneumoperitoneum on Bacterial Translocation. Presented at The Society of Laparoendoscopic Surgeons Annual Endoscopic Exposition 1993. Orlando, Florida. December 9-11, 1993.

28. Guy J, Horattas M: Pancreaticoduodenal Trauma in Adults and Children. Presented at the Cleveland Surgical Society. Cleveland, Ohio. March 3, 1993.

29. Lewis R, Horattas M: The Effect of Blood Transfusions on Breast Carcinoma Metastasis in the Fisher Rat. Presented at the Cleveland Surgical Society. Cleveland, Ohio, March 3, 1993.

30. Rosser J, Guyton D, Horattas M, Fenton A, Scarcella R, Kaufman K, Jaroch M, Marley R: Laparoscopic Cholecystectomy-Operative Strategy for Acute Inflammation. Presented at the International Hepatobiliary Pancreatic Association. San Diego, California. August 31-September 2, 1992.

31. Guyton D, Evans D, Moorman D, Horattas M, Bisconti N: Educational Aspects of Mechanical Retractors in Surgical Residency Programs. Presented at the Annual Clinical Congress of the American College of Surgeons. Atlanta, Georgia. October 1989.