[1]Department of Internal Medicine and Hematology Aiiku Hospital Sapporo 0640804 Japan;
[2]Department of Gastroenterology Aiiku Hospital Sapporo 0640804 Japan;
[3]Department of Surgical Pathology Asahikawa Medical University Hospital(formerly Department of Cancer Pathology Hokkaido University Faculty of Medicine) Asahikawa 0788510 Japan;
Anaplastic large-cell lymphoma; Anaplastic lymphoma kinase; Multiple lymphomatous polyposis; T-cell lymphoma; Gastrointestinal involvement;