A number of syndromes exhibit polyposis of the gastrointestinal tract. Our patient is an unusual case, as he had both upper and lower gastrointestinal polyposis with anatomic distributions and unique histopathologies that were consistent with the rare Cronkhite-Canada syndrome (CSS).
Our patient had widespread non-neoplastic polyposis throughout the stomach, small intestine, and colon. The pathology of these polyps was very similar to that of juvenile-type polyps, but it was unique in that the stroma showed striking edema and eosinophilic inflammation. The diagnosis of this patient (as with any case of CCS) involves a clinicopathologic correlation of endoscopic, pathologic, and cutaneous features.1
Patients may have dysgeusia and diarrhea and may be positive for antinuclear antiboda case of cronkhite-canada syndromeies.1
Approximately 400 cases of CCS have been reported worldwide, mainly from Japan.4
The characteristic pathology of CCS polyps, which was seen in our patient, consists of cystic gland dilation and elongation with variable hyperplasia, stromal edema, and eosinophilic inflammation ().2
Adenomatous polyps may occasionally develop. CCS patients also have an increased risk of gastric and predominantly left-sided colon cancers.5
Figure 6 Histology of gastrointestinal polyps. Both the gastric (A) and colonic (B) polyps are sessile and show hyperplastic, cystically dilated glands with edema and eosinophilic inflammation of the lamina propria (C). These composite features are most consistent (more ...)
The 5-year mortality rate for CCS has been reported to be 55%. Complications include gastrointestinal bleeding, intussusception, rectal prolapse, portal vein thrombosis, membranous glomerulonephritis, and protein-losing enteropathy.5
Forty-one percent of patients also have adenomas, including serrated adenomas, which are precursor lesions to colorectal cancer; they are associated with a 15% increased risk of cancer development.5
The most common sites for malignancy are the sigmoid colon and rectum, although our patient had prior right-sided colon cancer. Gastric cancer has been reported in 32 Japanese patients with CCS. These gastric cancers were usually large in size, well differentiated, and generally limited to the submucosa.8
CSS therapies have included corticosteroids for treatment of protein-losing enteropathy, weight loss, and diarrhea; nonsteroidal anti-inflammatory drugs for suppression of polyps; and proton pump inhibitors for suppression of acid. Our patient was treated with sulindac (150 mg twice daily), pantoprazole sodium (Protonix, Wyeth), and prednisone. He also received endoscopic surveillance.
Other polyposis syndromes involve different segments of the gastrointestinal tract (). These polyps can be classified as hamartomatous, adenomatous, or hyperplastic in nature. Hamartomas are lesions that result from disorderly proliferation of normally occurring tissue with varying degrees of hyperplasia, inflammation, and fibrosis. CCS is considered to be a hamartomatous polyposis syndrome.14
The distribution and pathology of polyps in CCS patients are distinct. CCS is differentiated from other hamartoma-tous polyposis syndromes by its widespread polyp distribution in the stomach, small bowel, and colon. Peutz-Jeghers syndrome involves hamartomatous lesions throughout the gastrointestinal tract, mainly in the jejunum, followed by the colon, and then the stomach. In addition, these patients often have associated extraintestinal manifestations, such as pigmented macules in the skin and mouth. Symptom onset usually occurs prior to 30 years of age.17
Juvenile polyposis syndrome develops before 10 years of age and is characterized by hamartomatous polyps with an inflammatory component; these polyps are usually found in the colon and, to a much lesser degree, in the stomach and small intestine.17
Polyposis Colonic Syndromes and Distribution of Polyps in the Gastrointestinal Tract
Adenomatous polyposis syndromes are characterized by inheritance of an abnormal autosomal dominant gene that results in multiple colorectal adenomatous polyps. Familial adenomatous polyposis (FAP) usually involves the colon and rectum and, to a much lesser extent, the stomach and small bowel. In FAP patients, the risk of adenomas progressing to colon cancer approaches 100% by the time these patients are 50 years of age.17
Hyperplastic polyps are often found in the rectum and are considered to be the most common type of nonmalignant colonic polyp. Hyperplastic polyposis syndrome is a specific entity in which hyperplastic polyps are found in abundance throughout the colon in the absence of gastric or small bowel involvement. Diagnostic criteria for hyperplastic polyposis syndrome include: 5 or more hyperplastic polyps proximal to the sigmoid colon, 2 of which are larger than 1 cm; any number of hyperplastic polyps proximal to the sigmoid colon in a patient who has a first-degree relative with hyperplastic polyposis; or, more than 30 hyperplastic polyps throughout the colon.13
This syndrome has a male predominance and is more common in patients over 40 years of age. Usually, the polyps are large, flat, and found along haustral folds. Polyps located in the proximal colon are usually sessile, serrated adenomas, which lead to an increased risk of right-sided colon cancer.19
CCS polyps have been described and interpreted as hyperplastic in appearance, but they are most appropriately characterized as hamartomatous and are distinct from hyperplastic polyps.
When encountering an unusual number or distribution of polyps during an endoscopy, clinicians can find it helpful to examine the entire gastrointestinal tract for additional involvement and to scrutinize the histopathology of the polyps. Recognition of extraintestinal manifestations also facilitates accurate identification of polyposis syndromes.