Endoscopic reduction of colocolonic intussusception due to metastatic malignant melanoma: A case report

BACKGROUND Intussusception rarely causes intestinal obstruction in adults. Metastatic malignant melanoma is the main cause of intussusception of the small intestine among adults. However, malignant melanoma rarely causes intussusception of the colorectum. Moreover, emergent surgery is usually performed for such cases. Here, we report a case of a patient with colocolonic intussusception caused by a malignant melanoma, for which endoscopic reduction and elective surgery were performed. CASE SUMMARY The patient was a 64-year-old woman who underwent multiple surgeries and received chemotherapy and immunotherapy for a malignant melanoma. During immunotherapy, she had abdominal pain, diarrhea, and bloody stool. Physical examination and laboratory studies did not reveal any findings that warranted emergent surgery. Computed tomography revealed intussusception in the descending colon without intestinal necrosis and perforation. Intussusception was reduced endoscopically, and elective surgery was performed. CONCLUSION This report suggests that endoscopic reduction and elective surgery constitute a treatment option for colocolonic intussusception of metastatic malignant melanomas.