Sivamainthan Vithiananthan, MD FACS

Chair of Surgery

Cambridge Health Alliance

1493 Cambridge Street

Cambridge, MA 02193

United States

I am the Chair of Surgery at Cambridge Health Alliance- Providing personalized care for patients in Boston, Cambridge, Sommerville, Everett, Malden and Chelsea Area in MA. My expertise is in Bariatric Surgery, laparoscopic and robotic surgery for hernia repair, Surgical treatment of GERD reflux), stomach surgery, Colon surgery, Hernia and gallbladder surgery for cancer and other conditions. My main area of focus is Bariatric ( weight loss) surgery and utilizing minimally invasive laparoscopic and robotic technology. Prior to this position I lead one of the most experienced Bariatric Surgery program in New England with a rich tradition of taking care of patients over 30 years. Bariatric and Metabolic surgery is provided at Cambridge Helath Alliance enter that takes care of patients struggling with obesity and its complications such as diabetes with surgeries such as Laparoscopic Gastric Bypass, Gastric Sleeve operations and Medication and behavioral management. Academically, I am very involved in teaching and training residents and medical students at Harvard Medical School and hold an academic appointment Associate Professor of Surgery at Harvard Medical School. I also hold an adjunct Professorship at Brown University. In 2026, I was inducted to the Academy of Master Surgeons as a member (MAAMSE), I serve in the MBSAQIP subcommittees. My research includes social factors affecting surgical outcome, effects of exercise and patient lifestyle modifications and success of surgery as well as surgical outcomes in minimally invasive surgery. I hold 4 patents for devices in treatment for obesity,

Bariatric (Severe Obesity) Procedures

• biliopancreatic diversion
• gastric banding
• gastroplasty
• laparoscopic gastric banding
• laparoscopic gastric bypass
• roux-en-Y gastric bypass

Endocrine (Gland)

• adrenal cancers/tumors
• adrenal surgery
• hyperparathyroidism
• pancreatic endocrine tumors
• parathyroid surgery
• pheochromocytoma
• thyroid nodules/cancer
• thyroid surgery

Abdomen and Digestion Disorder/Procedure

• abdominal pain
• anti-reflux procedures
• appendectomy
• fundoplication
• fundoplication - laparoscopic
• gastric cancer
• gastroesophageal reflux disease
• peptic ulcer disease
• peritonitis
• splenectomy

Liver, Gallbladder, Pancreas Disor/Proc

• bile duct surgery
• cholecystectomy
• laparoscopic cholecystectomy
• pancreatic cysts

Hernia Procedures

• abdominal hernia
• component separation
• epigastric hernia
• femoral hernia
• inguinal hernia
• laparoscopic hernia repair
• paraesophageal hernia
• umbilical hernia
• ventral hernia

Minimal Access Surgery

Colon and Rectal Disorders/Cancer

• anal cancer
• biopsy of tumors
• colectomy
• colon cancer screening
• colon surgery
• colon/rectal cancer
• colonic polyps
• colonoscopy
• colostomy
• diverticular disease
• gastrointestinal cancer
• ileostomy
• intestinal failure management
• intussusception
• irritable bowel syndrome
• laparoscopic colon surgery
• Meckel's diverticulum
• small bowel syndrome
• spastic colon
• stomach cancer

Minimally Invasive Procedures

• endoscopic surgery
• laparoscopic surgery

Surgical Oncology (Cancer/Tumors)

• basal cell cancer
• biopsy of tumors
• bone metastases
• colon cancer screening
• colon/rectal cancer
• endocrine cancer
• eyelid cancer/tumors
• fibroids
• melanoma
• neuroblastoma
• pelvic tumors
• pituitary gland tumors
• skin cancer
• stomach cancer/tumors
• thyroid cancer/nodules

Center for Bariatric Surgery, The Miriam Hospital Site Director, Surgery Residency and Medical Student Programs

Providence, RI

Chief

The Miriam Hospital

providence, RI

Attending

08/2007—Present

Cambridge Health Alliance

Cambridge, MA

Trauma/Acute Care Surgeon

04/2020—Present

The Warren Alpert Medical School of Brown University

Providence, RI

Professor

07/2018—04/2021

The Warren Alpert Medical School of Brown University

Providence, RI

Adjunct Professor

04/2021—Present

Harvard Medical School

Boston, MA

Associate Professor

07/2023—Present