Mesothelioma Diagnosis Differential Diagnosis 1

Question 1

Which malignancy most commonly mimics pleural mesothelioma on imaging and requires IHC for differentiation?

Accepted Answer

Metastatic lung adenocarcinoma

Answer

Metastatic lung adenocarcinoma to the pleura can produce diffuse pleural thickening identical to mesothelioma on imaging, requiring IHC to differentiate.

Question 2

Which IHC profile helps distinguish pleural mesothelioma (positive) from metastatic adenocarcinoma (negative)?

Accepted Answer

Calretinin positive, CEA negative

Answer

Mesothelioma characteristically stains positive for calretinin and negative for CEA, while the reverse pattern is seen in metastatic adenocarcinoma.

Question 3

Reactive mesothelial hyperplasia must be distinguished from mesothelioma because:

Accepted Answer

It is benign and does not require cancer treatment

Answer

Reactive mesothelial hyperplasia is a benign response to pleural injury and infection; misdiagnosing it as mesothelioma would lead to unnecessary aggressive treatment.

Question 4

Which condition most commonly causes benign pleural thickening that mimics mesothelioma on imaging?

Accepted Answer

Fibrothorax from prior empyema or hemothorax

Answer

Fibrothorax resulting from prior infection, hemorrhage, or trauma causes benign pleural fibrosis that can radiologically resemble malignant pleural disease.

Question 5

Solitary fibrous tumor of the pleura (SFTP) is distinguished from mesothelioma by which key feature?

Accepted Answer

It is usually localized and has a pedunculated attachment to the pleura

Answer

SFTP is typically a well-circumscribed, pedunculated, localized mass attached to the pleura by a stalk, in contrast to the diffuse pleural involvement of mesothelioma.

Mesothelioma Diagnosis Practice Test

Mesothelioma Diagnosis Practice Test

Mesothelioma Diagnosis Differential Diagnosis 1