Lesson 3B (Part 3) Flashcards Preview

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Flashcards in Lesson 3B (Part 3) Deck (22)
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1

Where are solid pseudopapillary tumours frequently seen?

In young female patients

2

What % of solid pseudopapillary tumours are malignant?

15%
- increases with age

3

Where do solid pseudopapillary tumours occur most often?

In the tail of the pancreas

4

What is the sonographic appearance of solid pseudopapillary tumours? (4)

1. Round encapsulated masses
2. Variable amounts of necrotic, cystic and soft tissue foci within
3/ Variable echotexture
- anechoic/hypoechoic
4. Posterior enhancement

5

What is the sonographic appearance of rare cystic tumours?

There is none
- extremely variable histologic origins

6

What are 3 types of pancreatic masses?

1. Endocrine tumors
2. Metastases
3. Lipoma

7

Where do pancreatic endocrine tumours originate?

From the ductal epithelium

8

What % of pancreatic endocrine tumours are pancreatic neoplasms?

Rare
- 1-5%

9

What are the 2 different presentations depending on endocrine hyperfunction?

1. Hyperfunctioning lesions
2. Non-hyperfunctions

10

How much do hyperfunctioning lesions comprised of?

90%
- tend to be small

11

What do hyperfunctioning lesions cause?

Clinical symptoms to come early

12

What do non hyperfunctioning lesions cause?

No endocrine related symptoms

13

When are non hyperfunctioning lesions discovered? (2)

1. When they are large
2. When they cause pain

14

What is the sonographic appearance of lipoma? (2)

1. Hypoechoic compared to usual echogenic appearance of fat
2. May be mixed or hyperechoic and have internal echoes

15

What are the most common pancreatic neoplasm seen on autopsy?

Metastatic tumours
- 4x as often as pancreatic cancer

16

What are the primary sources of metastatic tumours? (6)

1. Renal cell carcinoma
2. Breast
3. Lung
4. Colon
5. Melanoma
6. Stomach

17

What is a modality that is unreliable in diagnosing fatty replacement?

US
- because it has variable echogenicity

18

What is a modality that is the best in diagnosing fatty replacement?

CT

19

What does severe fatty replacement occur with? (5)

1. Cystic fibrosis
2. Diabetes
3. Obesity
4. NASH
5. Old age

20

What is a pseudomass caused by?

Fatty sparing in the uncinate process

21

What is fatty infiltration of the pancreas common in?

Middle aged women

22

What is the echogenicity of a fatty infiltration?

Moderately echoic pancreas