Mesothelioma Diagnosis Diagnostic Imaging 2

Question 1

On CT imaging, which feature is most suggestive of peritoneal mesothelioma?

Accepted Answer

Diffuse peritoneal thickening with ascites

Answer

Peritoneal mesothelioma typically appears on CT as diffuse peritoneal thickening or nodularity accompanied by ascites.

Question 2

Which imaging finding on CT is used to calculate the peritoneal cancer index (PCI) in peritoneal mesothelioma?

Accepted Answer

Distribution and size of peritoneal tumor deposits

Answer

The PCI is calculated by scoring the size and distribution of tumor deposits across 13 abdominal regions on CT to guide surgical planning.

Question 3

What is the advantage of using integrated PET/CT over CT alone in staging mesothelioma?

Accepted Answer

Better detection of occult nodal and distant metastatic disease

Answer

PET/CT combines functional metabolic data with anatomical detail, improving detection of nodal metastases and distant spread that CT alone may miss.

Question 4

Which MRI sequence is most useful for characterizing the relationship of pleural mesothelioma to the diaphragm?

Accepted Answer

T2-weighted imaging

Answer

T2-weighted MRI provides excellent contrast between tumor and adjacent structures, helping delineate diaphragmatic involvement.

Question 5

In mesothelioma imaging, contralateral pleural disease or pericardial extension indicates which TNM stage?

Accepted Answer

Stage IV

Answer

Extension to contralateral pleura or pericardium indicates advanced T4 disease, placing the patient in Stage IV of the IMIG staging system.

Mesothelioma Diagnosis Practice Test