Intestinal helminth infections have become uncommon in Korea but still occur sporadically, either as residual native infections or as imported infections among immigrants. We retrospectively reviewed 4 cases of intestinal helminth infections incidentally identified during colonoscopy at a single academic hospital between January 2019 and March 2026. One Cambodian immigrant had hookworm infection (species-level differentiation between Ancylostoma duodenale and Necator americanus was not possible). Of the 3 Korean patients, 2 had histopathologically confirmed Trichuris trichiura infection, and in 1, T. trichiura infection was suspected endoscopically, but the retrieved organism was not submitted for histopathologic examination. All patients were asymptomatic or had only nonspecific symptoms, and none showed peripheral eosinophilia. Colonoscopy allowed direct visualization and removal of each organism, demonstrating mucosal embedding in T. trichiura infection and firm mucosal attachment of the hookworm in the rectum. Three patients received a single 400-mg oral dose of albendazole; the case without histopathologic confirmation was managed without anthelmintic therapy. Recognition of characteristic endoscopic morphology can guide diagnosis even when histopathologic confirmation is unavailable, and management should be individualized according to diagnostic certainty and clinical context.
To analyze the clinical and endoscopic features of colonic anisakiasis. A retrospective chart review of 20 patients with colonic anisakiasis, who were diagnosed by colonoscopy at 8 hospitals between January 2002 and December 2011, was performed. Patients’ mean age was 53.6±10.74 years. Seventy percent patients were men. Acute abdominal pain was a common symptom that mostly developed within 48 hr after the ingestion of raw fish, and which lasted for 1-28 days. Sixty percent patients had ingested raw fish before the diagnosis of colonic anisakiasis and 40% patients were incidentally found to have colonic anisakiasis during the screening colonoscopies. Leukocytosis and eosinophilia were each found in 20% of the patients. In all patients who underwent colonoscopy, the worms were removed with biopsy forceps, except in 1 case, and a definite diagnosis of anisakiasis was made. In some cases of colonic anisakiasis, colonoscopy may be helpful in the diagnosis and treatment to avoid surgical intervention.
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