Anaplastic lymphoma kinase (ALK)-positive large B-cell lymphoma: a rare cause of ileal intussusception.

A man in his 60s, with no medical history of note, presented with persistent vomiting and dehydration on a background of four stone weight loss in the preceding 3-month period. CT scan of the abdomen and pelvis revealed a small bowel obstruction secondary to intussusception ([figure 1][1]). He