Neoplasia III: Carcinoid, GIST, Lymphoma (aka zebra lecture) Flashcards
Pathophys of gastric carcinoid tumors?
- Chronic gastritis or Gastric acid suppression
- Hypergastrinemia compensatory response
- Gastric diffuse neuroendocrine hyperplasia
=Tumor
Micro morphology of gastric carcinoid tumors?
islands or sheets of uniform cohesive cells, often (+) for NE markers such as chromogranin
What other characteristics/presentations are associated with gastric carcinoid tumors that secrete gastrin?
Zollinger-Ellison syndrome
slow-growing
mets uncommon
What other characteristics/presentations are associated with gastric carcinoid tumors that DON”T secrete gastrin?
aggressive
many mets at dx
carcinoid syndrome
How do ileal tumors present?
with carcinoid syndrome
flushing, bronchospasm, incr motility, R cardiac valve thickening
Most important prognostic factor for GI carcinoid?
location:
- foregut–rarely met, cured by srx
- midgut–multiple, aggressive
- hindgut–found incidentally
What labs are associated with Z-E syndrome?
Fasting gastrin level >1000 pg/ml
What diagnostic tests are used to dx Z-E syndrome?
Secretin stimulation test (measure gastrin levels incrementally after IV secretin administered)
positive = gastrin incr by >200
Treatment of Zollinger-Ellison syndrome, if solitary + non-met?
If mets?
Surgical resection Medical management (PPI, LA somatostatin)
resection
doxorubicin/streptozocin
Epidemiology of Intestinal Neuroendocrine Tumor (Carcinoid)?
Typically in late middle-aged patients
~6th decade
Most common location of Intestinal Neuroendocrine Tumor (Carcinoid)?
Ileum and appendix
**often at multiple sites
Most frequent symptom of Intestinal Neuroendocrine Tumor (Carcinoid)?
Abdominal pain
Common complication of Intestinal Neuroendocrine Tumor (Carcinoid)?
Intermittent obstruction
Most common neoplasm of appendix?
Intestinal Neuroendocrine Tumor (Carcinoid)
What is carcinoid syndrome?
Episodes of: flushing (95%) diarrhea, wheezing colicky abdominal pain Right heart endocardial fibrosis (50%)
**caused by vasoactive polypeptides, serotonin