Abdomen

Question 1

These tumors characterized by spindle cells and fibrous stroma:

Answer 1

Desmoid tumors; locally aggressive

Question 2

Desmoid tumors stain positive for that markers/

Answer 2

B-catenin
Vimentin
Actin

(Dont stain for cytokerain or S-100)

Question 3

Desmoid tumors can be associated with what familial syndromes?

Answer 3

FAP

Question 4

For HIPEC to be effective for pseudo myxoma peritoni, what residual tumor burden must be left after debulking?

Answer 4

<2 mm

Question 5

Chylous ascites is due to presence of thoracic or intestinal lymph fluid in the abd cavity; what causes it?

Answer 5

Western world; MCC is lymphoma (malignancy)

Developing world; infectious (TB, filiriasis)

Question 6

> 75% of SBP is caused by?

Answer 6

Gram negative rods (>50% are e.coli)

Question 7

Malignant peritoneal mesothelioma:

Answer 7

Aggressive, does not spread thru blood or lymph nodes

Remains contained in abdominal cavity

T stage of this tumor is based on location + size

Question 8

What is SAAG (serum ascites-albumin gradient)?

Answer 8

Subtract the albumin concentration of ascites from the albumin concentration of serum (ex: 1.8 - 0.5 = 1.3.

SAAG > 1.1 helps confirm portal HTN

Question 9

What do we do with mesenteric cysts found incidentally in children?

Answer 9

Resect

Can cause vascular compromise and intestinal infarction

Question 10

Cause of mesenteric cysts?

Answer 10

Thought to arise from sequestration of lymphatic vessels during development

Question 11

Causes of rectus sheath hematomas?

Answer 11

Rupture of inferior/superior epigastric arteries

Carnett sign- point of maximal tenderness does not change with change in position