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Gallbladder Polyps to Treat Or Not to Treat? SARAH Z

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Gallbladder Polyps to Treat Or Not to Treat? SARAH Z PEER REVIEWED FEATURE Gallbladder polyps To treat or not to treat? SARAH Z. WENNMACKER MD THOMAS J. HUGH MD, FRACS Gallbladder polyps do not usually cause symptoms and they are often identified incidentally during ultrasound investigation of the abdomen for other reasons. Most are harmless ‘pseudo’ polyps. Large polyps suggest the possibility of malignancy, indicating the need for additional diagnostic imaging and likely cholecystectomy. he management of patients with disease. GB polyps can be sub divided into KEY POINTS gallbladder (GB) polyps can be ‘true’ polyps and ‘pseudo’ polyps. About challenging. These polyps are 90% are pseudo polyps, which are harmless • Small gallbladder polyps do not elevated lesions of the inner GB nonneoplastic lesions consisting of chol e­ cause symptoms. Twall projecting into the lumen and are sterol aggregations (cholesterol polyps), Biliary symptoms may occur, but • often picked up incidentally on ultrasound inflammatory hyperplasia (inflammatory these are caused by gallstones, 5 microcalculi or a functional during investigation for other reasons. polyps) or adenomyomatosis. In the gallbladder disorder rather than They are relatively uncommon and are absence of gallstones or a functional GB the polyps. found in less than 5% of patients under­ disorder, pseudo polyps do not cause symp­ 1,2 • Most gallbladder polyps are not going biliary tree imaging. The incidence toms, and cholecystectomy is indicated true adenomatous polyps and of GB polyps increases with age, with a only if these lesions cannot be differentiated therefore there is no malignant median age at diagnosis of 46 years.3 Men from more sinister lesions. risk. are slightly more likely to experience GB True GB polyps are rare and can be • Indications for laparoscopic polyps than women (ratio, 1.15:1).4 divided into benign and malignant lesions. cholecystectomy include Benign adenomas (Figure 1) are uncommon gallbladder polyps of 10 mm Aetiology and account for only 5% of all GB polyps.5,6 or larger in size, or when there Risk factors for GB polyps are not well These have malignant potential and can is an increase in the size or number of polyps during defined but include age over 60 years, the give rise to adenocarcinomas, similar to the surveillance. presence of gallstones, primary sclerosing adenoma–carcinoma sequence of colonic cholangitis and inflammatory bowel polyps. Malignant polyps are mostly MedicineToday 2018; 19(4): 30-34 Dr Wennmacker is a surgical trainee in the Upper Gastrointestinal Surgical Unit, Royal North Shore Hospital, Sydney. Professor Hugh is the Chair of Surgery at the Northern Clinical School, The University of Sydney; and Head of the Upper Gastrointestinal Surgical Unit, Royal North Shore Hospital and North Shore Private Hospital, Sydney, NSW. 30 MedicineToday ❙ APRIL 2018, VOLUME 19, NUMBER 4 Downloaded for personal use only. No other uses permitted without permission. © MedicineToday 2018. Figure 1. Histological view of a ‘true’ benign adenomatous gallbladder polyp. adenocarcinomas (GB cancer), although polyp is a lesion fixed to the GB wall, pro­ Adenomyomatosis is a reactive, hamar­ other rarer types include squamous cell jecting into the lumen and with no dis­ tomatous malformation or nonneoplastic carcinoma, lymphoma and metastases.5,6 placement during patient repositioning. tumour ­like lesion of the GB characterised GB polyps can have either a pedunculated by hyperplasia of the muscular layer and Symptoms or sessile shape but, unlike gallstones, they proliferation of the mucosal glandular Most patients with GB polyps are asymp­ do not have an acoustic shadow (Figure structures. This can be confused with a tomatic, although nausea, vomiting and 2).11 When a polyp is found on ultrasound, GB polyp. For example, a large fundal­type right ­sided abdominal pain, similar to the the size, number and shape of all polyps adenomyoma of the GB (a subtype of symptoms of biliary colic, can occur. should be evaluated, as these characteris­ adenomyomatosis) may be difficult to These symptoms may be caused by tics influence the decision to intervene. differentiate from either an adenoma or a obstruction of the cystic duct by small Multiple small cholesterol polyps are not carcinoma, and ultimately cholecystec­ fragments that become detached from the uncommon, whereas adenomas or carci­ tomy and histopathological confirmation polyp, or by large polyps near the neck of nomas are mostly solitary (Figure 3). are required (Figure 4). the GB. However, most often they are caused by concomitant gallstones.7 Diagnosis Ultrasound is the diagnostic modality of choice as it is cheap, noninvasive and readily available in Australia. Although the diagnostic accuracy of ultrasound for detecting GB polyps is reported as being only moderate (sensitivity, 50 to 73%; specificity, 98%), it is still superior to CT or MRI.8­10 Most GB polyps are found Figures 2a and b. Ultrasound image of a 6 mm gallbladder polyp (a, left) compared with a 6 mm incidentally when screening the abdomen gal l stone (b, right), showing characteristic posterior echogenic shadowing from the gallstone for other reasons. only (arrow). AUREMAR/STOCK.ADOBE.COM © MODEL USED FOR ILLUSTRATIVE PURPOSES ONLY The classic ultrasound appearance of a MedicineToday ❙ APRIL 2018, VOLUME 19, NUMBER 4 31 Downloaded for personal use only. No other uses permitted without permission. © MedicineToday 2018. GALLBLADDER polyps continued Figure 3. Opened gallbladder showing a Figures 4a and b. Ultrasound image (a, left) cholesterol polyp (blue arrow), multiple and the surgical specimen (b, above) of a pigmented gallstones (white arrow) and an 20 mm benign adenomyoma of the gallbladder adenomyoma (yellow arrow). (arrow) mimicking a gallbladder cancer. A large GB mass should always raise cancer (Figures 6 and 7).12 differentiating a benign from a malignant concerns about a malignant process. If a malignancy is suspected, additional process, especially for small GB polyps.12 However, a well­ defined lesion in a diagnostic imaging is required. This may patient with typical biliary symptoms include a CT, MRI or positron emission Management may turn out to be a benign ‘sludge ball’ tomography (PET) scan to further The presence of a GB polyp often causes of inspissated bile (Figure 5). In contrast, characterise the lesion and to exclude local clinical concern, particularly in asymp­ poorly defined infiltrating lesions or or distant dissemination. As there is no tomatic patients, as surgical intervention sessile polyps are more suspicious for Medicare rebate in Australia for an MRI or is usually only indicated for neoplastic PET scan for either the diagnosis or work­up polyps. However, distinguishing between of a GB cancer, patients having these inves­ true and pseudo GB polyps based on tigations will incur an out­ of­pocket imaging alone is not always easy or expense. If available, endoscopic ultrasound possible. may also be helpful to characterise a suspi­ Patients with polyps of 10 mm or more cious lesion and has the added advantage in diameter should undergo cholecystec­ of enabling a fine­needle biopsy to be done. tomy irrespective of whether they have However, it is important for patients to be symptoms. This is not because large assessed by a multi disciplinary hepatobil­ polyps have a greater potential to become iary cancer unit before a biopsy is arranged, malignant than smaller polyps but as this has the potential to increase local because most benign polyps never exceed recurrence rates, thereby decreasing the 10 mm in diameter. In contrast, once a Figure 5. Ultrasound image of a 22 mm benign ‘sludge ball’ with well-defined borders chance of long­term cure. polyp becomes larger than 10 mm in max­ and posterior acoustic shadowing. Serum tumour markers, such as imal diameter, it is much more likely to carcino embryonic antigen and cancer be malignant, even if there are no sinister antigen 19­9, are not helpful in radiological features.13­18 A GB polyp Figure 6. Ultrasound image of a 25 mm Figures 7a and b. Ultrasound image from May 2013 (a, left) and an MRI scan from March polypoid gallbladder cancer showing indistinct 2016 (b, right) showing slow growth of a 25 mm sessile polypoid gallbladder cancer (arrow) and infiltrative borders.over 33 months. 32 MedicineToday ❙ APRIL 2018, VOLUME 19, NUMBER 4 Downloaded for personal use only. No other uses permitted without permission. © MedicineToday 2018. GALLBLADDER polyps continued RISK FACTORS WARRANTING MANAGEMENT OF GALLBLADDER POLYPS CHOLECYSTECTOMY FOR GALLBLADDER POLYPS OF 5 TO 9 MM • Primary sclerosing cholangitis Gallbladder polyp identified on ultrasound • Inflammatory bowel disease • Sessile polyp shape • Imaging evidence of asymmetrical Polyp size <10 mm Polyp size ≥10 mm gallbladder wall thickening greater than 4 mm • Age older than 50 years • High-risk ethnicity (e.g. Northern Polyp has no malignant Polyp has malignant features and patient is features or patient is Indian, Polish, Pima Native American, asymptomatic symptomatic Chilean Mapuche Indian) greater than 18 mm in size has a high likelihood of being an advanced cancer Polyp size <5 mm Polyp size 5 to 9 mm Cholecystectomy and should be removed with open chole­ cystectomy and en­bloc liver resection and lymphadenectomy. Resection is also Patient has risk factors: warranted irrespective of polyp size where • PSC or IBD there are characteristic malignant features, • sessile polyp or wall Yes thickening >4 mm such as rapid growth or typical malignant • age >50 years radiological findings. • high-risk ethnicity Laparoscopic cholecystectomy is Perform follow-up warranted for symptomatic patients with ultrasound at GB polyps smaller than 10 mm where no 12 months alternative cause for the symptoms can No be found. Typical biliary symptoms may be caused by either microcalculi or an underlying functional GB abnormality Perform follow-up 17 No Yes that cannot be detected on ultrasound. ultrasound at 6 months The management of asymptomatic patients with GB polyps smaller than 10 mm is more difficult and remains con­ Polyp increases in size by ≥2 mm troversial.
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