Professional Titles
- Pediatric Surgeon
Research Interests
My research interests are primarily focused on long-term outcomes of patients born with colorectal congenital problems, their surgical reconstruction and associated malformations. I also believe in education and helping other countries to achieve excellence upon treatment of these conditions.
Teaching
-
Associate Professor
(2016)
School of Medicine, Surgery
Pediatric Colorectal Surgery; Anorectal and Urogenital Malformations (imperforate anus, cloaca, cloacal exstrophy, vaginal agenesis); Hirschsprung Disease; Total Colonic Aganglionosis; Bowel Management (fecal incontinence and idiopathic constipation).
Publications
- Clain EC, Woodfield K, Hutchens KJ, Bischoff A, Alaniz VI. Obstructed hemi vagina and renal anomalies in patients with and without anorectal malformations. J Pediatr Adolesc Gynecol. 2023 Dec 18. [Epub ahead of print] PubMed PMID: 38122961
- Vu A, Harris KT, Wehrli L, Bischoff A, Wood D. Unrepaired cloacal exstrophy in an adult: Medical and ethical considerations. Urol Case Rep. 2023 Nov;51:102602. PubMed PMID: 37965120
- Bischoff A, Hayes K, Guimaraes C, Merritt A, Wickham M, Schneider L, Martin H, Ketzer J, Rodriguez V, Peña A, De La Torre L. Standardization of radiograph readings during bowel management week. Pediatr Surg Int. 2023 Jul 20;39(1):236. PubMed PMID: 37468717
- Wehrli LA, Reppucci ML, De La Torre L, Ketzer J, Rieck JM, Cooper EH, Judd-Glossy L, Peña A, Bischoff A. Gastrointestinal quality of life and bowel function in adults born with anorectal malformation and hirschsprung disease. Pediatr Surg Int. 2023 Jul 18;39(1):234. PubMed PMID: 37464109
- Domínguez-Muñoz A, De La Torre L, Santos-Jasso K, Schneider L, Merritt A, Wickham M, Ketzer J, Rodriguez V, Peña A, Bischoff A. Identifying predictive factors for bowel control in patients with spina bifida and spinal cord injuries. Pediatr Surg Int. 2023 Jul 11;39(1):231. PubMed PMID: 37432519
- Domínguez-Muñoz A, Bischoff A, Wehrli LA, Judd-Glossy L, Schneider L, Merritt A, Wickham M, Ketzer J, Rodriguez V, Peña A, De La Torre L. Radiologically supervised bowel management program outcome in patients with chronic idiopathic constipation. Pediatr Surg Int. 2023 Jul 10;39(1):229. PubMed PMID: 37428259
- Wehrli LA, Reppucci ML, Woodfield K, Ketzer J, Rieck JM, Cooper EH, De La Torre L, Pena A, Bischoff A, Alaniz VI. Fertility concerns and outcomes in females with anorectal malformations. Pediatr Surg Int. 2023 Jul 9;39(1):228. PubMed PMID: 37422894
- Wehrli LA, Reppucci ML, Ketzer J, Dominguez-Muñoz A, Cooper EH, Peña A, Bischoff A, De La Torre L. Incidence of medullary thyroid carcinoma and Hirschsprung disease based on the cosmos database. Pediatr Surg Int. 2023 Jul 7;39(1):227. PubMed PMID: 37418029
- Reppucci ML, Alaniz VI, Wehrli LA, Torre L, Wood D, Wilcox DT, Appiah LC, Peña A, Bischoff A. Reproductive and Family Building Considerations for Female Patients with Anorectal And Urogenital Malformations. J Pediatr Surg. 2023 Aug;58(8):1450-1457. PubMed PMID: 36229236
- PTN exclusive article: How constipation can be misdiagnosed as Hirschsprung disease in ARM patients.
- Stevens J, de La Torre L, Hall J, Simmons H, Krause A, Ketzer J, Schletker J, Judd-Glossy L, Trainor S, Wilson P, Peña A, Bischoff A. The importance of dedicated colorectal team participation in the management of spina bifida and spinal cord injury patients. Pediatr Surg Int. 2022 Jan;38(1):69-74. PubMed PMID: 34647156
- Judd-Glossy L, Ariefdjohan M, Ketzer J, Matkins K, Schletker J, Krause A, Simmons H, Pena A, De La Torre L, Bischoff A. Considering the value of online support groups for colorectal conditions: perspectives from caregivers and adult patients. Pediatr Surg Int. 2022 Jan;38(1):31-42. PubMed PMID: 34562117
- Reppucci ML, De La Torre L, Peña A, Judd-Glossy L, Pickett K, Ketzer J, Bischoff A. The use of social media among the pediatric colorectal community. Pediatr Surg Int. 2022 Jan;38(1):43-50. PubMed PMID: 34554295
- Reppucci ML, Arnold MA, Lovell M, Santos-Jasso K, Ketzer J, Pena A, de la Torre L, Bischoff A. Is the appendix a good organ to diagnose total colonic aganglionosis?. Pediatr Surg Int. 2022 Jan;38(1):25-30. PubMed PMID: 34554294
- Reppucci ML, Alaniz VI, Wehrli LA, Torre L, Wood D, Wilcox DT, Appiah LC, Peña A, Bischoff A. Reproductive and family building considerations for female patients with anorectal and urogenital malformations. J Pediatr Surg. 2022 Sep 19. [Epub ahead of print] PubMed PMID: 36229236
- Reppucci ML, Wehrli LA, Wilcox D, Ketzer J, Pena A, de la Torre L, Bischoff A, Wood D. Patient-reported urinary outcomes in adult males with congenital colorectal conditions. Pediatr Surg Int. 2022 Dec;38(12):1709-1716. PubMed PMID: 36151341
- Reppucci ML, Wehrli LA, Wilcox D, Ketzer J, Pena A, de la Torre L, Bischoff A, Wood D. Sexual function and fertility of adult males with anorectal malformations or Hirschsprung disease. Pediatr Surg Int. 2022 Dec;38(12):1693-1699. PubMed PMID: 36151340
- Vargas MC, Wehrli LA, Louiselle A, Ketzer J, Reppucci ML, Juddy-Glossy L, Alaniz VI, Wilcox DT, Wood DN, Peña A, De La Torre L, Bischoff A. Do adult patients with congenital colorectal conditions know their diagnosis?. Pediatr Surg Int. 2022 Dec;38(12):1723-1728. PubMed PMID: 36129533
- Judd-Glossy L, Ariefdjohan M, Ketzer J, Wehrli LA, Pena A, de la Torre L, Bischoff A. Long-term outcomes of adult patients following surgery for congenital colorectal conditions: analysis of psychosocial functioning. Pediatr Surg Int. 2022 Dec;38(12):1685-1692. PubMed PMID: 36127514
- Reppucci ML, Nolan MM, Cooper E, Wehrli LA, Schletker J, Ketzer J, Peña A, Bischoff A, De la Torre L. The success rate of antegrade enemas for the management of idiopathic constipation. Pediatr Surg Int. 2022 Dec;38(12):1729-1736. PubMed PMID: 36107238
- Wehrli LA, Bischoff A, De La Torre L, Reppucci ML, Ketzer J, Peña A, Alaniz VI. Pelvic exams and cervical cancer screening in patients with anorectal malformations. Pediatr Surg Int. 2022 Dec;38(12):1681-1684. PubMed PMID: 36107236
- Wehrli LA, Reppucci ML, Ketzer J, de la Torre L, Peña A, Bischoff A. Stricture rate in patients after the repair of anorectal malformation following a standardized dilation protocol. Pediatr Surg Int. 2022 Dec;38(12):1717-1721. PubMed PMID: 36107235
- Reppucci ML, Wehrli LA, Schletker J, Nolan MM, Rieck J, Fares S, Ketzer J, Rove K, Pena A, de la Torre L, Bischoff A. The effect of an enhanced recovery protocol in pediatric patients who undergo colostomy closure and Malone procedures. Pediatr Surg Int. 2022 Dec;38(12):1701-1707. PubMed PMID: 36098796
- Meyers ML, Mirsky DM, Santos-Jasso KA, Ketzer J, Bischoff A. Visualization of the Anal Dimple by Fetal MRI: Is It Feasible?. Fetal Diagn Ther. 2022;49(7-8):293-300. PubMed PMID: 35917796
- Reppucci ML, De La Torre L, Pickett K, Wehrli L, Nolan MM, Ketzer J, Bischoff A. Social media communities for patients and families affected by congenital pediatric surgical conditions. Pediatr Surg Int. 2022 Jul;38(7):1047-1055. PubMed PMID: 35588326
- Roach JP, Derderian SC, Ketzer J, Benge M, Kaizer A, Bischoff A. The pediatric surgery match from the applicant perspective. J Pediatr Surg. 2022 Nov;57(11):589-591. PubMed PMID: 35105454
- Stevens J, de La Torre L, Hall J, Simmons H, Krause A, Ketzer J, Schletker J, Judd-Glossy L, Trainor S, Wilson P, Peña A, Bischoff A. The importance of dedicated colorectal team participation in the management of spina bifida and spinal cord injury patients. Pediatr Surg Int. 2022 Jan;38(1):69-74. PubMed PMID: 34647156
- Judd-Glossy L, Ariefdjohan M, Ketzer J, Matkins K, Schletker J, Krause A, Simmons H, Pena A, De La Torre L, Bischoff A. Considering the value of online support groups for colorectal conditions: perspectives from caregivers and adult patients. Pediatr Surg Int. 2022 Jan;38(1):31-42. PubMed PMID: 34562117
- Reppucci ML, De La Torre L, Peña A, Judd-Glossy L, Pickett K, Ketzer J, Bischoff A. The use of social media among the pediatric colorectal community. Pediatr Surg Int. 2022 Jan;38(1):43-50. PubMed PMID: 34554295
- Reppucci ML, Arnold MA, Lovell M, Santos-Jasso K, Ketzer J, Pena A, de la Torre L, Bischoff A. Is the appendix a good organ to diagnose total colonic aganglionosis?. Pediatr Surg Int. 2022 Jan;38(1):25-30. PubMed PMID: 34554294
- Meier KM, Wilcox DT, Bischoff A. Total urogenital mobilization via prone approach. Urology Video Journal 13 (2022) 100128
- Pena A, Bischoff A, de la Torre L. Reply to letter to the editor. J Pediatr Surg. 2021 Jun;56(6):1254. PubMed PMID: 33608107
- Bischoff A, Torre L, Peña A. Letter to the Editor. J Pediatr Surg. 2021 Jun;56(6):1255. PubMed PMID: 33509655
- Hall J, Schletker J, Judd-Glossy L, Edmonds T, Krause A, Simmons H, Ketzer J, Peña A, De la Torre L, Bischoff A. A review of adopted colorectal patients: a parent's perspective. Pediatr Surg Int. 2021 Apr;37(4):431-435. PubMed PMID: 33475771
- Alaniz VI, Wilcox DT, Arnold M, Bodmer JL, de la Torre L, Peña A, Bischoff A. Neovagina stricture complicated by high-grade dysplasia in a patient with history of cloaca and ulcerative colitis: a case report and review of the literature. Pediatr Surg Int. 2021 Apr;37(4):491-494. PubMed PMID: 33433664
- Judd-Glossy L, Ariefdjohan M, Ketzer J, Curry S, Schletker J, Edmonds T, Krause A, Simmons H, Pena A, De La Torre L, Bischoff A. Analysis of patients' and caregivers' psychosocial functioning in colorectal conditions: comparison of diagnosis, gender, and developmental functioning. Pediatr Surg Int. 2021 Apr;37(4):437-444. PubMed PMID: 33423102
- Schletker J, Wiersch J, Ketzer J, Edmonds T, Krause A, Simmons H, Peña A, De La Torre L, Bischoff A. An overview of opioid usage and regional anesthesia for patients undergoing repair of anorectal malformation. Pediatr Surg Int. 2021 Apr;37(4):457-460. PubMed PMID: 33415489
- Bischoff A, Guimaraes CVA, Mirsky DM, Santos-Jasso KA, Zaretsky MV, Ketzer J, Hall J, Mueller C, de La Torre L, Peña A, Meyers ML. Visualization of the fetal anus by prenatal ultrasound for the diagnosis of anorectal malformations: is it feasible?. Pediatr Surg Int. 2021 Apr;37(4):425-430. PubMed PMID: 33399927
- Woods C, Kapur RP, Bischoff A, Lovell M, Arnold M, Peña A, Flockton A, Sharkey KA, Belkind-Gerson J. Neurons populating the rectal extrinsic nerves in humans express neuronal and Schwann cell markers. Neurogastroenterol Motil. 2021 Jul;33(7):e14074. PubMed PMID: 33382200
- Morrison ZD, Reyes-Ferral C, Mansfield SA, Alemayehu H, Bowen-Jallow K, Tran S, Santos MC, Bischoff A, Perez N, Lopez ME, Langham MR Jr, Newman EA. Diversity, Equity, and Inclusion: A strategic priority for the American Pediatric Surgical Association. J Pediatr Surg. 2021 Apr;56(4):641-647. PubMed PMID: 33309300
- Peña A, De La Torre L, Belkind-Gerson J, Lovell M, Ketzer J, Bealer J, Bischoff A. Enema-Induced spastic left colon syndrome: An unintended consequence of chronic enema use. J Pediatr Surg. 2021 Feb;56(2):424-428. PubMed PMID: 33199058
- Vuille-Dit-Bille RN, de La Torre L, Hall J, Ketzer J, Peña A, Bischoff A. Hirschsprung disease and anorectal malformations - An uncommon association. J Pediatr Surg. 2021 Mar;56(3):487-489. PubMed PMID: 32507634
- Morrison ZD, Reyes-Ferral C, Mansfield SA, Alemayehu H, Bowen-Jallow K, Tran S, Santos MC, Bischoff A, Perez N, Lopez ME, Langham MR Jr, Newman EA. Diversity, Equity, and Inclusion: A strategic priority for the American Pediatric Surgical Association. J Pediatr Surg. 2020 Dec 8. [Epub ahead of print] PubMed PMID: 33309300
- Peña A, De La Torre L, Belkind-Gerson J, Lovell M, Ketzer J, Bealer J, Bischoff A. Enema-Induced spastic left colon syndrome: An unintended consequence of chronic enema use. J Pediatr Surg. 2020 Oct 31. [Epub ahead of print] PubMed PMID: 33199058
- De La Torre L, Zornoza M, Peña A, Bischoff A, Ketzer J, Ruiz A. Transanal rectal mucosectomy and muscular plication: A new technique for rectal prolapse in patients with an anorectal malformation. J Pediatr Surg. 2020 Nov;55(11):2531-2535. PubMed PMID: 32586611
- Vuille-Dit-Bille RN, de La Torre L, Hall J, Ketzer J, Peña A, Bischoff A. Hirschsprung disease and anorectal malformations - An uncommon association. J Pediatr Surg. 2020 May 16. [Epub ahead of print] PubMed PMID: 32507634
- Bischoff A, de La Torre L, Peña A. Comparative effectiveness of imaging modalities for preoperative assessment of anorectal malformation in the pediatric population. J Pediatr Surg. 2020 Feb;55(2):354. PubMed PMID: 31718867
- Bischoff A, de La Torre L, Peña A. Comparative Effectiveness of Imaging Modalities for Preoperative Assessment of Anorectal Malformation in the Pediatric Population. J Pediatr Surg. 2019 Oct 27. [Epub ahead of print] PubMed PMID: 31718867
- Hecht S, Hall J, Ketzer J, Walker J, Trecartin A, Wilcox D, Peña A, Bischoff A. Ectopic ureters in anorectal malformations. Pediatr Surg Int. 2019 Sep;35(9):1005-1008. PubMed PMID: 31278478
- Judd-Glossy L, Ariefdjohan M, Curry S, Ketzer J, Pena A, Bischoff A. A survey of adults with anorectal malformations: perspectives on educational, vocational, and psychosocial experiences. Pediatr Surg Int. 2019 Sep;35(9):953-961. PubMed PMID: 31270673
- Dewberry L, Trecartin A, Peña A, Pierre MS, Bischoff A. Systematic review: sacral nerve stimulation in the treatment of constipation and fecal incontinence in children with emphasis in anorectal malformation. Pediatr Surg Int. 2019 Sep;35(9):1009-1012. PubMed PMID: 31256299
- Bischoff A, Alaniz VI, Trecartin A, Peña A. Vaginal reconstruction for distal vaginal atresia without anorectal malformation: is the approach different?. Pediatr Surg Int. 2019 Sep;35(9):963-966. PubMed PMID: 31256298
- Bischoff A, Trecartin A, Alaniz V, Hecht S, Wilcox DT, Peña A. A cloacal anomaly is not a disorder of sex development. Pediatr Surg Int. 2019 Sep;35(9):985-987. PubMed PMID: 31256297
- Trecartin AC, Peña A, Lovell M, Bruny J, Mueller C, Urquidi M, Bischoff A. Anal duplication: is surgery indicated? A report of three cases and review of the literature. Pediatr Surg Int. 2019 Sep;35(9):971-978. PubMed PMID: 31256296
- Dewberry L, Peña A, Meyers ML, Mirsky DM, Bischoff A. Differentiating presacral masses in anorectal malformations and isolated sacrococcygeal teratomas. Pediatr Surg Int. 2019 Sep;35(9):979-983. PubMed PMID: 31256295
- Bischoff A, Bealer J, Wilcox DT, Peña A. Error traps and culture of safety in anorectal malformations. Semin Pediatr Surg. 2019 Jun;28(3):131-134. PubMed PMID: 31171146
- Goddard GR, Rymeski B, Jenkins T, Mullapudi B, Dickie BH, Bischoff A, Peña A, Levitt MA, Frischer JS. A comparison of surgical complications after appendicostomy and neoappendicostomy in pediatric patients. J Pediatr Surg. 2019 Aug;54(8):1660-1663. PubMed PMID: 31036369
- Peña A, Bealer J, Bischoff A. Re: "Assessing the long term manometric outcomes in patients with previous laparoscopic anorectoplasty (LARP) and posterior sagittal anorectoplasty (PSARP)" by Chung, et al. JPS. Vol. 53, no. 10 October 2018?pp1933-1936. J Pediatr Surg. 2019 Jun;54(6):1262. PubMed PMID: 30851957
- Bischoff A, Peña A, Ketzer J, Campbell K, O' Neill B, Stence N, Mirsky D. The conus medullaris ratio: A new way to identify tethered cord on MRI. J Pediatr Surg. 2018 Nov 6. [Epub ahead of print] PubMed PMID: 30518494
- Peña A, Bischoff A. Commentary to "Fact or myth? The long shared common wall between the fistula and the urethra in male anorectal malformations with urethral bulbar fistula". Pediatr Surg Int. 2018 Nov 15. [Epub ahead of print] PubMed PMID: 30430283
- Samuk I, Bischoff A, Freud E, Pena A. Tethered cord in children with anorectal malformations with emphasis on rectobladder neck fistula. Pediatr Surg Int. 2018 Nov 9. [Epub ahead of print] PubMed PMID: 30413919
- Schletker J, Edmonds T, Jacobson R, Ketzer J, Hall J, Trecartin A, Peña A, Bischoff A. Bowel management program in patients with spina bifida. Pediatr Surg Int. 2018 Nov 7. [Epub ahead of print] PubMed PMID: 30402681
- Dewberry L, Peña A, Mirsky D, Ketzer J, Bischoff A. Sacral agenesis and fecal incontinence: how to increase the index of suspicion. Pediatr Surg Int. 2018 Nov 3. [Epub ahead of print] PubMed PMID: 30392128
- Acker S, Peña A, Wilcox D, Alaniz V, Bischoff A. Transition of care: a growing concern in adult patients born with colorectal anomalies. Pediatr Surg Int. 2018 Nov 3. [Epub ahead of print] PubMed PMID: 30392127
- Bischoff A, Brisighelli G, Dickie B, Frischer J, Levitt MA, Peña A. Idiopathic constipation: A challenging but manageable problem. J Pediatr Surg. 2018 Sep;53(9):1742-1747. PubMed PMID: 29079312
- Bischoff A, Frischer J, Knod JL, Dickie B, Levitt MA, Holder M, Jackson L, Peña A. Damaged anal canal as a cause of fecal incontinence after surgical repair for Hirschsprung disease - a preventable and under-reported complication. J Pediatr Surg. 2016 Sep 4. [Epub ahead of print] PubMed PMID: 27624566
- Bischoff A, Bealer J, Peña A. Critical analysis of fecal incontinence scores. Pediatr Surg Int. 2016 Aug;32(8):737-41. PubMed PMID: 27357400
- Samuk I, Bischoff A, Hall J, Levitt M, Peña A. Anorectal malformation with rectobladder neck fistula: A distinct and challenging malformation. J Pediatr Surg. 2016 Oct;51(10):1592-6. PubMed PMID: 27345453
- Bischoff A. The surgical treatment of cloaca. Semin Pediatr Surg. 2016 Apr;25(2):102-7. PubMed PMID: 26969234
- Gupta A, Bischoff A. Pathology of cloaca anomalies with case correlation. Semin Pediatr Surg. 2016 Apr;25(2):66-70. PubMed PMID: 26969228
- Colares JH, Purcaru M, da Silva GP, Frota MA, da Silva CA, Melo-Filho AA, Bischoff A, Peña A. Impact of the Bowel Management Program on the quality of life in children with fecal incontinence. Pediatr Surg Int. 2016 May;32(5):471-6. PubMed PMID: 26875175
Practice Locations
Children's Hospital Colorado Anschutz Medical Campus
13123 East 16th Ave
Aurora, CO 80045
720-777-1234
Hospital Affiliation
13123 East 16th Ave
Aurora, CO 80045
720-777-1234
Hospital Affiliation
- Children's Hospital Colorado
- University of Colorado Hospital
Specialty Information
Specialties
- Pediatric Surgery
- Colon and Rectal Surgery
- Surgery
Clinical Interests
My many clinical interests include congenital colorectal problems such as Anorectal and Urogenital malformation (imperforate anus, cloaca, cloacal exstrophy, vaginal agenesis); Hirschsprung Disease; Total Colonic Aganglionosis; Bowel Management (fecal incontinence and idiopathic constipation).
Care Philosophy
I strive to provide the best surgical and clinical care for my patients. I believe in devoting time to patients and family explaining and discussing prognosis, long-term expectations as well as surgical reconstruction and possible future implications. I also believe in following our patients through out life.
My many clinical interests include congenital colorectal problems such as Anorectal and Urogenital malformation (imperforate anus, cloaca, cloacal exstrophy, vaginal agenesis); Hirschsprung Disease; Total Colonic Aganglionosis; Bowel Management (fecal incontinence and idiopathic constipation).
Care Philosophy
I strive to provide the best surgical and clinical care for my patients. I believe in devoting time to patients and family explaining and discussing prognosis, long-term expectations as well as surgical reconstruction and possible future implications. I also believe in following our patients through out life.
Personal Interests
In my spare time, I enjoy spending time with family, watching good movies, and practicing outside sports (running, biking, swimming). I also enjoy travelling the world to try to improve colorectal care for children everywhere.
Volunteer Activities
Travelling the world to try to improve colorectal care everywhere. I have travelled to more than 30 different countries to give lectures and live surgical demonstrations on how to treat congenital colorectal problems.
Public Speaking
Yes
Surgical Treatment of Colorectal Problems in Children (from prenatal to long-term outcomes) - 3 day intensive workshop with live surgical demonstrations.
In my spare time, I enjoy spending time with family, watching good movies, and practicing outside sports (running, biking, swimming). I also enjoy travelling the world to try to improve colorectal care for children everywhere.
Volunteer Activities
Travelling the world to try to improve colorectal care everywhere. I have travelled to more than 30 different countries to give lectures and live surgical demonstrations on how to treat congenital colorectal problems.
Public Speaking
Yes
Surgical Treatment of Colorectal Problems in Children (from prenatal to long-term outcomes) - 3 day intensive workshop with live surgical demonstrations.
General Information
Download CVLanguages: English, Portuguese, Spanish
Department: Surgery-Peds Surgery