Double-balloon enteroscopy untangles three small bowel tumor diagnoses

Three patients whose intestinal symptoms pointed in the wrong direction ended up with the right diagnosis after doctors used double-balloon enteroscopy, a technique that lets endoscopists reach deep into the small bowel and take tissue samples from precisely chosen spots. A case report published in BMC Gastroenterology describes two men with small bowel lymphoma and one man with a gastrointestinal stromal tumor, all of whom initially appeared to have lymphoma or, in one case, a simple viral infection. The report shows how the scope itself is only half the answer: targeted biopsies matter, but so does knowing when the tissue taken is not enough.

The first patient, a 67-year-old man, arrived with severe diarrhea that was initially attributed to a viral infection. Biopsies from the distal jejunum showed only focal atypia, cells with abnormal features that hinted at trouble but proved nothing. Biopsies taken from a more proximal segment, however, contained atypical lymphoid cells, and those findings confirmed intestinal T-cell lymphoma. Despite CHOP-based chemotherapy, the man died approximately six weeks after the diagnosis.

The second patient, a 46-year-old man with long-term intestinal lymphangiectasia, developed small bowel obstruction, and double-balloon enteroscopy identified an ulcerated stricture in the ileum. The biopsies showed atypical lymphoid cells, but necrosis and crush artifact prevented definitive classification. Only after a CT-guided biopsy of the mass was obtained did the team establish diffuse large B-cell lymphoma.

The third patient, a 72-year-old man, presented with obstructed defecation and imaging findings that suggested small bowel lymphoma. Biopsies revealed a spindle-cell tumor expressing CD117 and DOG1, supporting a diagnosis of gastrointestinal stromal tumor rather than lymphoma.

Small bowel lymphoma can present with diffuse mucosal abnormalities, strictures, or masses, and these features may resemble inflammatory enteropathy or other intestinal tumors. When clinical findings, imaging, and histology do not agree, reaching a diagnosis becomes genuinely difficult. That difficulty is the thread running through all three cases. In the first, the initial suspicion of infection delayed recognition of a lymphoma that biopsies eventually confirmed. In the second, the endoscopic samples were suggestive but technically inadequate, and a different sampling route was required. In the third, imaging pointed toward lymphoma while the tissue told a different story entirely.

The authors draw a practical conclusion from these experiences. Double-balloon enteroscopy enables targeted tissue sampling, but definitive tumor classification rests on histopathological and immunohistochemical examination of what is collected. When the results conflict with the clinical picture, the report advises clinicians to reassess the lesion’s location and the adequacy of the sampled tissue. If endoscopic histopathology remains inconclusive, further tissue acquisition is necessary rather than optional.

In the third case, the spindle-cell tumor's expression of CD117 and DOG1 supported a gastrointestinal stromal tumor diagnosis even though imaging had suggested lymphoma. In the first case, the identification of atypical lymphoid cells in proximal biopsies confirmed intestinal T-cell lymphoma, whereas the distal jejunal biopsies had shown only focal atypia.

As a three-patient case series, the report cannot establish how often these diagnostic conflicts occur or how frequently double-balloon enteroscopy resolves them. It documents, however, that in each of these patients the combination of deep endoscopic access, targeted biopsies, and willingness to seek additional tissue when initial samples were inconclusive led to a specific diagnosis and, in two of the three cases, to treatment that produced symptom relief or longer-term recovery.

Subject of Research: Use of double-balloon enteroscopy with targeted biopsies to diagnose small bowel tumors in three patients

Article Title: Double-balloon enteroscopy in the diagnosis of small bowel tumors: lessons from three cases

Article References: Qin, X., Zang, H., Wen, Q., Liu, F., & Cui, B. (2026). Double-balloon enteroscopy in the diagnosis of small bowel tumors: lessons from three cases. BMC Gastroenterology. https://doi.org/10.1186/s12876-026-05504-y

Image Credits: AI Generated

DOI: 10.1186/s12876-026-05504-y

Keywords: double-balloon enteroscopy, small bowel tumors, intestinal T-cell lymphoma, diffuse large B-cell lymphoma, gastrointestinal stromal tumor, biopsy, immunohistochemistry, small bowel obstruction, endoscopic ultrasonography, imatinib, case report, Double-balloon