Clin Prof Ang Tiing Leong is Head and Senior Consultant of the Department of Gastroenterology and Hepatology at Changi General Hospital. His subspecialty interests include pancreaticobiliary diseases, image-enhanced endoscopy, endoscopic resection of early gastrointestinal neoplasia and advanced therapeutic endoscopy, particularly therapeutic ERCP and interventional EUS. He is also an Adjunct Professor at the Yong Loo Lin School of Medicine, NUS.
Clinical focus
Pancreaticobiliary & advanced endoscopy (ERCP/EUS).
Qualifications (as publicly listed)
MBBS, MRCP (UK), FRCP (Edin), FAMS, FASGE.
Where they practise
- Clinic / practice: Department of Gastroenterology and Hepatology, Changi General Hospital — Simei
- Hospital / training affiliation(s): Changi General Hospital (CGH)
Getting to the clinic
Clin Prof Ang Tiing Leong is Head and Senior Consultant of the Department of Gastroenterology and Hepatology at Changi General Hospital (CGH), in the Simei area in the east of Singapore. The hospital is served by nearby MRT and bus routes, with taxi and ride-hailing drop-off available at the entrances; when planning your journey it is best to confirm the most convenient station and bus services for your starting point, or check the hospital’s own directions, rather than assume a single route. A direct taxi drop-off is convenient if you are attending for a procedure such as a colonoscopy and prefer not to drive afterwards.
As a public hospital, CGH has visitor carparks for those who drive, which can be busy during clinic hours, so allow a little extra time. The campus is large, so it helps to arrive early and follow the signage or ask at the information counters, where staff can direct you to the Gastroenterology and Hepatology department and the correct clinic area on arrival.
What pancreaticobiliary and advanced endoscopy covers
Clin Prof Ang’s subspecialty interests are pancreaticobiliary diseases and advanced therapeutic endoscopy, including image-enhanced endoscopy and endoscopic resection of early gastrointestinal neoplasia. His work covers:
- Therapeutic ERCP (endoscopic retrograde cholangiopancreatography) — examining and treating problems of the bile and pancreatic ducts, such as bile duct stones or blockages.
- Interventional EUS (endoscopic ultrasound) — detailed assessment of the pancreas, bile ducts and nearby structures, with the ability to take samples and perform procedures.
- Image-enhanced endoscopy — techniques that highlight subtle changes in the lining of the digestive tract.
- Endoscopic resection of early gastrointestinal neoplasia — removing early cancers or pre-cancerous lesions through an endoscope.
These advanced procedures allow many conditions of the pancreas, bile ducts and digestive tract lining to be diagnosed and treated through an endoscope, often avoiding more invasive surgery and helping to detect and remove early lesions before they progress. Image-enhanced endoscopy uses special light and magnification to make subtle changes in the lining easier to see, which can improve the detection of early disease during a gastroscopy or colonoscopy. The aim across this work is to find problems early, treat them in the least invasive way that is safe and effective, and then keep an appropriate watch afterwards.
What to expect at a consultation
A visit usually begins with a detailed discussion of your symptoms, any abnormal scans or blood tests, and your medical history, followed by a physical examination. Depending on the findings, the doctor may review or arrange imaging such as ultrasound, CT or MRI, blood tests, and endoscopic procedures such as EUS or ERCP. The doctor will explain why each test or procedure is recommended and what it involves, then discuss the likely diagnosis and plan. For pancreaticobiliary conditions and early lesions, care is often coordinated with other specialists within the hospital. Because advanced endoscopy can carry its own considerations, the doctor will also explain the benefits and risks of any procedure recommended, so that you can give informed consent and know what to expect on the day and during recovery.
Preparing for your appointment
To help your consultation, it is useful to bring:
- Photo identification and any GP, polyclinic or specialist referral letter.
- Previous scans, blood tests, endoscopy reports and histology results.
- A current list of medications and supplements, including blood thinners, which are important before endoscopic procedures.
- A written list of your symptoms and questions.
- Details of any previous gallbladder, pancreas, bile duct or stomach conditions or surgery.
After your consultation and follow-up
After the appointment you will usually have a clear plan. If an advanced procedure such as ERCP, EUS or endoscopic resection is recommended, the team will explain the preparation, including fasting and any adjustment to medication, and arrange a date. Results of tissue samples are reviewed at a follow-up visit. For ongoing conditions or after the removal of early lesions, surveillance and review help monitor the situation over time. You are welcome to seek a second opinion. Seek urgent attention for symptoms such as jaundice, severe abdominal pain, fever with chills, black or bloody stools, or persistent vomiting.
Booking, referrals and fees
As this is a public hospital department, a referral from a GP or polyclinic is usually needed to attend, and it may help with subsidies for eligible patients. For eligible procedures, MediSave, MediShield Life and Integrated Shield Plans may contribute within the limits that apply, while consultations may be subsidised or paid out of pocket depending on your status. As coverage and subsidy eligibility vary, confirm the details and any estimates directly with the hospital before treatment.
Common questions
What is therapeutic ERCP?
Therapeutic ERCP not only examines the bile and pancreatic ducts but also treats problems found, such as removing a stone or relieving a blockage, all through an endoscope.
What does endoscopic resection of early neoplasia involve?
It is the removal of early cancers or pre-cancerous lesions from the lining of the digestive tract using an endoscope, which can avoid more invasive surgery in suitable cases.
Will I need sedation for these procedures?
Advanced endoscopic procedures are usually performed with sedation for comfort. The team will explain the arrangements and aftercare before the procedure.
Do I need a referral to be seen here?
As a public hospital department, a referral from a GP or polyclinic is generally needed, and it may also help with subsidy eligibility.
Why might image-enhanced endoscopy be used?
It uses special light and magnification to highlight subtle changes in the lining of the digestive tract, which can help detect early or pre-cancerous lesions that may be harder to see with standard views.
Related guides
Sources & verification
See also: our editorial directory of gastroenterologists in Singapore and our shortlist of gastroenterology clinics.
This is an independent, factual profile compiled from the public sources listed above — not a paid listing, advertisement or endorsement. Details can change; always verify a doctor’s current registration on the Singapore Medical Council public register and confirm specifics directly with the clinic. This page is general information, not medical advice or a recommendation of any individual practitioner. See our editorial policy.
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