The Diagnostic Path: Imaging, Biopsy, and Genetics

Diagnosing chronic enteropathy associated with SLCO2A1 (CEAS) is a multi-step process that often starts with a visual inspection of the small intestine and ends with a definitive look at your DNA. Because CEAS can look like other conditions—such as Crohn’s disease or damage caused by pain medications—doctors use a combination of advanced imaging, endoscopy, and genetic testing to confirm the diagnosis ^[1][2].

Endoscopic Findings: The “Shape” of CEAS

The most telling clues for CEAS often come from enteroscopy (a procedure to look deep into the small intestine). While traditional colonoscopies may not reach the affected areas, specialized tools allow doctors to see the hallmark ulcers ^[3][4].

Critical Warning on Capsule Endoscopy: “Pill cameras” (capsule endoscopy) are a common way to view the small bowel, but they carry a high risk of getting trapped (capsule retention) if you have an undiagnosed stricture. Capsule endoscopy should not be used as a routine tool for CEAS unless a specialist has carefully assessed obstruction risk using cross-sectional imaging or a specialized patency capsule first ^[5][6].

In a person with CEAS, the ulcers usually have very specific features:

• Location: They are often found in the ileum (the lower part of the small intestine), though they can involve other segments like the jejunum ^[7][8].
• Shape: Unlike the long, deep cracks often seen in Crohn’s disease, CEAS ulcers are typically shallow and “circular” or “eccentric-oblique” ^[1][2]. They often wrap around the inner circumference of the bowel ^[8].
• Margins: The edges of the ulcers are usually “discrete,” meaning they have a sharp, clear border between the ulcer and the healthy tissue ^[1][4].

Advanced Imaging: CT and MR Enterography

To see the entire length of the small intestine and check for complications safely, doctors use CT enterography (CTE) or MR enterography (MRE) ^[8]. These scans provide a map of how the disease has affected the bowel wall.

Common findings on these scans include:

• Mural Thickening: The walls of the small intestine often look thickened and “layered” or “stratified” when the contrast dye is injected ^[8].
• Strictures: Many patients develop strictures, which are narrowings of the intestine caused by repeated ulcer healing and scarring ^[8].
• Upstream Dilation: If a stricture is severe, the part of the intestine before the narrowing may become widened (dilated) as it struggles to push food through ^[8].

Notably, CEAS often lacks the “messy” inflammation seen in Crohn’s disease; the fat surrounding the intestine usually looks normal rather than inflamed ^[8][9].

The Pathology Report: Looking at the Cells

When a doctor takes a biopsy (a small tissue sample), a pathologist looks at it under a microscope. In CEAS, the findings are often labeled “nonspecific,” meaning they show general signs of injury but don’t immediately name the disease ^[7].

However, specialized testing can provide more detail:

• SLCO2A1 Staining: Pathologists can use an optional stain called immunohistochemistry to see if the SLCO2A1 protein is present in the blood vessels of the intestine ^[10][11]. In most people with CEAS, this staining is either completely absent or significantly reduced ^[11][12]. This is an adjunct, not a universally validated requirement.
• Vascular Dilation: The tiny blood vessels near the ulcers may appear unusually widened or dilated ^[7].

The Main Confirmatory Test: Genetic Testing

While imaging and endoscopy can strongly suggest CEAS, the main confirmatory test when interpreted in clinical context is genetic testing ^[10][2].

The test looks for biallelic pathogenic variants in the SLCO2A1 gene ^[10][13]. “Biallelic” means that both copies of the gene (one from your mother and one from your father) have a variant that prevents them from working correctly ^[13][14]. Genetic testing isn’t perfect (it can find variants of uncertain significance or miss variants depending on the assay), but without it, it can be difficult to distinguish CEAS from other rare conditions like CMUSE or NSAID-induced damage ^[1][15].

Diagnosis Completeness Checklist

You can use this list to track whether your diagnostic process has covered the essential bases:

• [ ] Clinical History: Does the patient have chronic, unexplained low iron or low albumin? ^[7]
• [ ] Endoscopy: Were circular or eccentric-oblique ulcers found? ^[1]
• [ ] Differential Diagnosis: Have Crohn’s disease, NSAID use, intestinal tuberculosis, CMUSE, and Behçet disease been evaluated? ^[16]
• [ ] Imaging: Did a CT or MR enterography check for strictures safely? ^[8]
• [ ] Pathology: Did biopsies show nonspecific injury or optionally reduced SLCO2A1 staining? ^[10]
• [ ] Genetic Testing: Has a test identified two pathogenic or likely pathogenic variants in the SLCO2A1 gene? ^[2]