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- Neoplasia in structures adjacent to the intestines can spread and cause external compression.
- Pancreatic tumours in particular can extend and impinge on the duodenum.
- Pedicles of tumours such as lipomas in horses can become wound in loops of intestine leading to obstruction and possible strangulation.
- Seen occasionally in cat (rarer in dog)
- Usually towards end of intestines
- E.g. at the ileocaecocolic valve.
- Gut proximal to tumour becomes thickened due to hypertrophy of smooth muscle as a result of trying to force ingesta past progessively narrowing lumen.
- Produces "hose pipe intestine".
- Seen with carcinoma, lymphoma, leiomyoma and other tumours.