Compared to patients with CD+AS, internal fistula
was more common in patients with CD.
In our case, an internal fistula
formed between the proximal jejunum and the distal ileum, in addition to the presence of an encapsulated granuloma.
It may be a secondary location from the ileum via internal fistula
 or by intestinal peristalsis .
as a route of infection in acute suppurative thyroiditis.
In June 1999, he presented with gastrointestinal obstruction and internal fistula
formation, and underwent terminal ileum and ascending colon resection.
Due to nonspecific symptoms, the diagnosis of internal fistula
is difficult (5).