GI Flashcards
(203 cards)
Etiology of colorectal CA
Most adenocarcinomas from mucosa
rarely carcinoid, lymphomas, kaposi
3rd common CA
Screening for colorectal CA begins?
if family Hx?
50
10 yrs younger than youngest afflicted
Most common site of distal colorectal spread
liver
also lumbar/vertebral veins to lungs, lymphatic regionally
20% mets at presentation
Familial adenomatous polyposis
Tx?
Auto dom disease
hundreds of adenomatous polyps in colon
Colon ALWAYS involved q/ duodenum 90%
prophylactic colectomy
Gardner’s syndome(5 things)
polyps plus: oseomas, dental abnormalities, benigh soft tissue tumors, desmoid tumors, sebacious cysts
CRC 100% by age 40
Turcots Syndrome
Auto recessive
polyps plus cerebellar medulloblastoma or gioblastoma multiforme
Peutz-Jeghers (4)
single or mtpl harmatomsa scattered throughout the GI in small bowel, colon, stomach
W/ pigments lips/oral mucosa, face, genitalia,
low malignant potential w/ slight increase risk w/ other carcinomas
intrussception or Gi bleed concerns
pigmented spots on lips, oral mucosa and maybe genitalia and has increased risk of other carcinomas w/ already harmatomas
Peutz jeghers
Familial juvenile polyposis
rare
presents in childhood w/ small risk of CRC
10 -100s polyps
Lynch Syndrome I
Site specific CRC - early onset w/o antecedent maple polyposis
Lynch II includes increased # and risk of other CA in the family (female genital tract, stomach, pancreas, brain, breast, biliary)
Signs of Colorectal CA?
melana/hematochezia
ab pain, bowel habit change, Fe deficiency anemia
most common cause of bowl obstruction in adults
Colorectal CA
R sided CRC CA see? (4)
LESS obstruction w/ larger lumen
occult blood loss and melana
RARE change in bowel movements
Triad - anemia, Weakness and RLQ mass?
L sided CRC see?(3)
more obstruction
Change in bowel habits, pencil stools
hematochezia more common
Rectal CA has (3)
hematochezia
tenesmus
rectal mass
high rate of recurrence
Tx of CRC is?
surgery
adjuvant therapy depends on stage
tumor marker of CRC and pt of it
other tests and timelines (3)
CEA **
measure recurrence risk- gotten q3-6 months
Also get
- stool guiac,
- annual CT of ab/pelvis and CXRfor 5yrs,
- Colonoscopy 1yr then q3
What Tx is NOT indicated for CRC?
radiation
Hyperplastic polyps
most common nonneoplastic polyps
no therapy needed, just removed,
PSeudopolyps seen in?
UC
inflammatory polyps
3 types of adenoma CRC
how does shape change things?
Tubular - most common (60-80%)
Tubovillous - intermediate risk
Villious - great risk
Sessile (flat) is bad vs pedunculated
most CRC polyps found in
rectosigmoid region
usually asymptomatic
Cause of diverticulosis
increased intraluminal pressure
- bulges through weakness in colon wall (blood vessel)
Risk factors for diverticulosis (2)
low fiber diets
family history