| duodenal tumours | <radiology> 90% benign, in 2nd and 3rd portion: 50% malignant, in 4th portion: most malignant, of malignancies: 80-90% leading to adenocarcinoma Differential diagnosis: benign, tubular adenoma, leiomyoma, lipoma, hamartoma (Peutz-Jeghers), prolapsed antral polyp, Brunner's gland adenoma (really hypertrophy and hyperplasia), malignant, adenocarcinoma (80-90% of malignant lesions), villous adenoma (pre-malignant), carcinoid / isleT-cell tumour (12 Dec 1998) |
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| duodenal ulcer | A nonmalignant ulcer that develops in the portion of the gastrointestinal tract that is exposed to gastric secretions. Peptic ulcers occur in the stomach or duodenum. Common symptoms include epigastric abdominal pain and anorexia. Complications include perforation, penetration (into adjacent organs) and bleeding. The microorganism Helicobacter pylori has been implicated in the development of peptic ulcer disease. For this reason, new therapies may now involve the use of oral antibiotics. (27 Sep 1997) |
| duodenase | <enzyme> Partial amino acid sequence given in first source Registry number: EC 3.4.21.- (26 Jun 1999) |