Editing Small bowel mass (section)

=== '''Malignant''' (descending order of prevalence) ===

* '''NET''' (neuroendocrine tumour) (44%)
** See separate topic
* '''Adenocarcinoma''' (33%)
** See separate topic
* '''Lymphoma''' (8%)
** See separate topic
* '''Mesenchymal tumours (GIST)''' (17%)
** See 'GIST' under 'UGIS' and separate topic in this section
** Also leiomyosarcoma
* '''Metastatic disease'''
** Generally the result of severe disease with overwhelmingly poor prognosis
*** Exceptions - melanoma and RCC, where significantly improved prognosis can be found after resection
** Palliative bypass can be considered
** Self-expandable metal stents can be placed in those with low performance status
** Gastrostomy/jejunostomy can be considered
** Extraluminal involvement
*** Peritoneal carcinomatosis
*** Gastric
*** Colon
*** Ovarian
** Haematogenous spread
*** Melanoma (most common - found in >50% of patients with palliative melanoma)
*** Colon
*** Breast
*** Kidney
*** Lung
*** Sarcoma