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PubMed This is a summary of 8 peer-reviewed journal articles Updated
Radiology · Gallbladder Agenesis

Confirming the Diagnosis: Imaging and Surgery

At a Glance

Gallbladder agenesis is definitively diagnosed using an MRCP, a specialized MRI that maps the bile ducts. Ultrasounds often produce false positives by mistaking nearby intestines for a shrunken gallbladder. If a gallbladder isn't found during surgery, the procedure must be safely aborted.

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Because gallbladder agenesis (GBA) is so rare, standard diagnostic tools often struggle to identify it correctly. Most patients begin their journey with a routine ultrasound, but for GBA, ultrasound is frequently more of a “trap” than a help [1][2]. Getting a clear diagnosis requires specialized technology and careful surgical planning.

Why Ultrasound Falls Short

While ultrasound is excellent for finding gallstones, it is notorious for producing “false positives” in people born without a gallbladder [3].

  • The Problem of “Non-Visualization”: When a radiologist cannot see the gallbladder, they may assume it is simply “contracted” (shrunken) or filled with stones, rather than completely absent [4][3].
  • Anatomical Confusion: Nearby structures, like loops of the small intestine or gas, can sit in the “gallbladder fossa” (the space where the gallbladder should be), mimicking the appearance of a diseased organ [2].

The Gold Standard: MRCP

To definitively confirm that the gallbladder is missing and not just hidden, doctors turn to Magnetic Resonance Cholangiopancreatography (MRCP) [1].

  • What it is: An MRCP is a specialized type of MRI that focuses entirely on the biliary tree—the system of “pipes” that carry bile from your liver to your intestine [5].
  • Why it works: Unlike ultrasound, which can be blocked by gas or bone, MRCP uses powerful magnets and radio waves to create a crystal-clear, three-dimensional map of your internal anatomy [1].
  • Confirming Absence: It is considered the “gold standard” because it can prove the gallbladder is absent and rule out an ectopic gallbladder (one that is in an unusual location) [1][5].

Safety in the Operating Room

Historically, many cases of GBA were only discovered during surgery [6]. If you are undergoing a planned laparoscopic cholecystectomy (gallbladder removal surgery) and the surgeon cannot find the organ, strict safety protocols must be followed:

  1. Stop Dissection: The surgeon must immediately stop trying to find the gallbladder. Continuing to cut in search of a missing organ is the leading cause of iatrogenic bile duct injury—accidental damage to the main “plumbing” of the liver, which can have serious long-term consequences [7][8].
  2. Intraoperative Imaging: The surgeon should perform an Intraoperative Cholangiogram (IOC) or Intraoperative Ultrasound (IOUS) while you are still asleep. These tools help map the bile ducts in real-time to confirm if the gallbladder is truly missing or just hidden [8].
  3. Abort the Procedure: If imaging confirms the gallbladder is not there, modern surgical guidelines recommend “aborting” (stopping) the surgery [8][7].
  4. Post-Operative Imaging: After waking up, you will likely be sent for an MRCP to definitively confirm the diagnosis and ensure no other anatomical issues were missed [8][1].

By confirming the diagnosis with an MRCP before surgery, you and your surgical team can avoid the risks of an unnecessary or dangerous operation [5][6].

Next Page: Management and Living Without a Gallbladder

Common questions in this guide

Why did my ultrasound show a gallbladder if I was born without one?
Ultrasounds can produce false positives by mistaking nearby structures, like loops of the small intestine or gas, for a contracted or stone-filled gallbladder. They struggle to definitively prove the organ is absent.
What is the best test to confirm gallbladder agenesis?
Magnetic Resonance Cholangiopancreatography (MRCP) is considered the gold standard. It uses powerful magnets and radio waves to create a clear, 3D map of your biliary tree to prove the gallbladder is missing and rule out an unusual location.
What happens if my surgeon cannot find my gallbladder during surgery?
Your surgeon should immediately stop searching to prevent accidental damage to your bile ducts. They will typically perform intraoperative imaging to confirm the organ is missing and then abort the surgery.
Why is it dangerous to keep looking for a missing gallbladder during surgery?
Continuing to cut in search of a missing gallbladder is the leading cause of accidental damage to the liver's main plumbing system. This is called an iatrogenic bile duct injury and can have serious long-term consequences.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.If you cannot find the gallbladder during surgery, what is your specific plan to map the bile ducts and prevent injury?
  2. 2.Will you perform an Intraoperative Cholangiogram (IOC) or Ultrasound if things look abnormal in the operating room?
  3. 3.Why is an MRCP more reliable than the ultrasound I already had?
  4. 4.Does my MRCP show any other anatomical variations in my liver or bile ducts?
  5. 5.If we confirm my gallbladder is missing, what tests will we use to monitor for stones in my other bile ducts?

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References

References (8)
  1. 1

    Case report of a gallbladder agenesis, a diagnostic challenge.

    Cegarra-Besora A, González-Álvarez P, Montraveta-Querol M, Bovo MV

    International journal of surgery case reports 2022; (94()):107026 doi:10.1016/j.ijscr.2022.107026.

    PMID: 35398782
  2. 2

    Optimization of diagnostic ultrasonography of the gallbladder based on own experience and literature.

    Smereczyński A, Kołaczyk K, Bernatowicz E

    Journal of ultrasonography 2020; (20(80)):e29-e35 doi:10.15557/JoU.2020.0006.

    PMID: 32320550
  3. 3

    Gallbladder agenesis diagnosed during pregnancy- Case report and a literature review.

    Pinto MYP, Neelankavil S

    International journal of surgery case reports 2023; (105()):108019 doi:10.1016/j.ijscr.2023.108019.

    PMID: 36966713
  4. 4

    Acute Cholecystitis-like Presentation in an Adult Patient with Gallbladder Agenesis: Case Report and Literature Review.

    Elzubeir N, Nguyen K, Nazim M

    Case reports in surgery 2020; (2020()):8883239 doi:10.1155/2020/8883239.

    PMID: 33381346
  5. 5

    Case Report: Congenital gallbladder agenesis.

    Gao B, Bai X, Zhang R

    Frontiers in medicine 2026; (13()):1778733 doi:10.3389/fmed.2026.1778733.

    PMID: 41695164
  6. 6

    Gallbladder agenesis in the elderly: a diagnostic challenge.

    Ismail IB, Rebii S, Zenaidi H, Zoghlami A

    The Pan African medical journal 2020; (37()):259 doi:10.11604/pamj.2020.37.259.23268.

    PMID: 33598074
  7. 7

    Gallbladder agenesis discovered during surgery, a sum of inadequate decisions.

    Molina GA, Ayala AV, Arcia AC, et al.

    Annals of medicine and surgery (2012) 2022; (77()):103585 doi:10.1016/j.amsu.2022.103585.

    PMID: 35444803
  8. 8

    A case report of a patient with gallbladder agenesis resulting in a common bile duct injury.

    Bahraini A, Odom JW, Talukder A

    International journal of surgery case reports 2018; (51()):99-101 doi:10.1016/j.ijscr.2018.07.024.

    PMID: 30149331

This page explains diagnostic imaging and surgical protocols for gallbladder agenesis for educational purposes only. Always consult your gastroenterologist or surgeon regarding your specific imaging results and surgical plan.

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