Mesothelioma Diagnosis Diagnostic Imaging 1 — Questions and Answers
Question 1: Which imaging modality is typically the first used when mesothelioma is suspected based on symptoms?
- Chest X-ray (Correct answer)
- PET scan
- MRI
- Ultrasound
Correct answer: Chest X-ray
A chest X-ray is the initial imaging tool used when pleural mesothelioma is suspected, often revealing pleural effusion or pleural thickening.
Question 2: What finding on chest X-ray is most commonly associated with pleural mesothelioma?
- Pleural effusion (Correct answer)
- Pulmonary nodules
- Pneumothorax
- Mediastinal widening
Correct answer: Pleural effusion
Pleural effusion (fluid buildup in the pleural space) is the most common initial radiographic finding in pleural mesothelioma.
Question 3: CT scan of the chest in pleural mesothelioma most characteristically shows which finding?
- Circumferential pleural thickening (Correct answer)
- Central lung mass
- Bilateral hilar adenopathy
- Ground-glass opacities
Correct answer: Circumferential pleural thickening
CT imaging typically reveals circumferential or nodular pleural thickening, often encasing the lung, which is highly characteristic of malignant pleural mesothelioma.
Question 4: Which imaging study is most useful for assessing the extent of chest wall invasion in mesothelioma?
- MRI (Correct answer)
- Chest X-ray
- PET scan
- Ultrasound
Correct answer: MRI
MRI provides superior soft tissue contrast and is the best modality for evaluating chest wall, diaphragm, and mediastinal invasion in mesothelioma staging.
Question 5: PET scan (FDG-PET) is used in mesothelioma primarily for which purpose?
- Detecting distant metastases and nodal involvement (Correct answer)
- Measuring pleural fluid volume
- Guiding needle biopsy
- Assessing lung function
Correct answer: Detecting distant metastases and nodal involvement
FDG-PET imaging is used in mesothelioma to detect distant metastatic disease and mediastinal lymph node involvement to guide staging.
Question 6: Which CT finding helps differentiate malignant pleural mesothelioma from a benign pleural effusion?
- Pleural nodularity and thickening >1 cm (Correct answer)
- Simple fluid density without loculation
- Absence of contrast enhancement
- Bilateral symmetric pleural involvement
Correct answer: Pleural nodularity and thickening >1 cm
Pleural nodularity and pleural thickening greater than 1 cm are CT features that strongly suggest malignancy rather than benign effusion.
Mesothelioma Diagnosis Diagnostic Imaging 1
Which imaging modality is typically the first used when mesothelioma is suspected based on symptoms?