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Michael A. Keller, M.D., FACS, FASCRS

General Summary

Michael A. Keller, M.D., FACS, FASCRS, is a colon and rectal surgeon and earned his medical doctorate from The University of Texas Health Science Center in Houston, Texas.


  • Fellowship in Colon and Rectal Surgery
    The University of Texas Southwestern Medical Center, Dallas, TX
  • Residency in General Surgery, Chief Resident
    University of Mississippi Medical Center, Jackson, MS
  • Medical Doctorate
    The University of Texas Health Science Center, Houston, TX

Accolades & Memberships

  • American College of Surgeons
  • American Society of Colon and Rectal Surgeons
  • Texas Medical Association
  • Texas Society of Colon and Rectal Surgeons

Surgery Locations

  • CHRISTUS Santa Rosa Hospital - Medical Center
  • CHRISTUS Santa Rosa Hospital - Westover Hills
  • Methodist Hospital - San Antonio
  • Methodist Hospital Specialty and Transplant
  • Methodist Hospital Stone Oak
  • Methodist Ambulatory Surgery Center
  • North Central Baptist Hospital
  • St. Luke's Baptist Hospital


  • Anal fissures
  • Anal cancer
  • Anal fistulae
  • Anorectal disease (HPV, levator ani syndrome, skin tags, anal warts, lichen sclerosis, etc.)
  • Bloating, early satiety, gastritis, anemia
  • Colon cancer
  • Colon polyps
  • Colonic dysmotility and inertia
  • Colonic strictures
  • Constipation
  • Crohn's disease
  • Diverticulitis
  • Fecal incontinence
  • Hemorrhoids
  • HPV and anal dysplasia
  • Ileostomy/colostomy malfunction, bleeding and prolapse
  • Inflammatory bowel disease (IBD)
  • Lynch syndrome
  • Pelvic floor dysfunction (defecatory disorder)
  • Parastomal hernias
  • Perineal trauma
  • Perirectal abscesses
  • Pilonidal disease
  • Polyposis syndrome
  • Pouchitis
  • Rectal cancer
  • Rectal pain
  • Rectal bleeding, lower GI bleeding
  • Rectal prolapse
  • Rectocele
  • Recurrent C. diff colitis, toxic megacolon
  • Thrombosed hemorrhoids
  • Ulcerative colitis
  • Vaginal agenesis
  • Vaginal and recto-vaginal fistula


  • Anal manometry
  • Anal sphincter chemodenervation/BOTOX® treatment of fissures
  • Colonoscopy, screening and therapeutic
  • Colostomy and ileostomy reversal surgery
  • Endorectal ultrasound
  • Excision of skin tags
  • Fecal transplant for refractory c. diff colitis
  • Fistulotomy
  • Hemorrhoidectomy
  • Ileoanal anastomosis (J-pouch) surgery
  • Minimally invasive surgery for small bowel, colon and rectal resections (benign and malignant)
  • Laparoscopic surgery
  • Trans-anal minimally invasive surgery (TAMIS) and trans-anal endoscopic microsurgery (TEM)
  • Robotic surgery
  • SILS (single incision laparoscopic surgery)
  • Pelvic floor evaluation, therapy and biofeedback
  • Pilonidal cystectomy
  • Sphincter-preserving rectal cancer surgery
  • Screening upper endoscopy/esophagogastroduodenoscopy
  • Sacral nerve stimulation for fecal incontinence
  • Sphincterotomy and LIFT procedure
  • Virtual colonoscopy

Medical Practice

  • Colon & Rectal Surgical Associates of San Antonio, San Antonio, TX (August 2011 – present)

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