Table 2. Causes of nonidiopathic adult intestinal intussusception.

Enteric benign

Adhesions  Adenoma  Cantor tubes  Celiac disease  Crohn disease  Endometriosis  Malignant stromal (GIST) tumor  Hamartoma  Hemangioma  Inflammatory polyp  Kaposi sarcoma  Lipoma  Meckel diverticulum  Neurofibroma  Peutz–Jegher polyp  Tuberculosis  Submucosal hemorrhages from unregulated anticoagulation

Enteric malignant

Adenocarcinoma  Carcinoid tumor  Leiomyosarcoma  Lymphoma  Metastatic carcinoma (melanoma most common)  Malignant GIST  Neuroendocrine tumor

Colonic benign

Adenoma  Inflammatory pseudopolyp  Lipoma

Colonic malignant

Adenocarcinoma  Lymphoma  Sarcoma