Question:

Which of the imaging findings of invasive thymoma is false?
1. Ill-defined borders.
2. Infiltrative growth into the neighbouring structures.
3. Growing along the mediastinal fat planes and pleural surfaces.
4. Invasion to trachea, pericardium, heart and great vessels.
5. Normal ADC values on MRI.





Answer:

The correct answer for the question "Which of the imaging findings of invasive thymoma is false?" is:

5. Normal ADC values on MRI.



Explanation
1. Ill defined border is an important radiological finding of invasive thymoma. [Invasive thymoma is typically an anterior mediastinal mass which is radiologically characterized by its ill-defined borders and infiltrative growth into the neighbouring structures.]

2. Infiltration into the neighbouring structures is an another important radiological finding of invasive thymoma.[Invasive thymoma is typically an anterior mediastinal mass which is radiologically characterized by its ill-defined borders and infiltrative growth into the neighbouring structures.]

3. Invasive thymoma also grows along the mediastinal fat planes and pleural surfaces. [Invasive thymoma usually grows along the mediastinal fat planes and pleural surfaces.]

4. [Invasion to trachea, pericardium, heart and great vessels can occur, at which time most patients become symptomatic.]

5. Low ADC values is an important finding of malignant mediastinal masses. [Malignant mediastinal mass lesions were found to have significant low ADC values.]



From the manuscript:
Characterization of Malignant Thrombus in an Invasive Thymoma with Intravascular Growth
Radiology Case. 2013 Feb; 7(2):17-23


This article belongs to the Chest section.




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From the manuscript

Characterization of Malignant Thrombus in an Invasive Thymoma with Intravascular Growth

Free full text article: Characterization of Malignant Thrombus in an Invasive Thymoma with Intravascular Growth

Abstract
We report an unusual case of an invasive thymoma with a thrombus in the right atrium and describe the radiological findings consistent with the malignant nature of the thrombus. The thrombus showed significant enhancement on computerized tomography images similar to the tumoral mass. On magnetic resonance imaging, both the tumor and the thrombus have heterogeneously high signal intensities on T2-weighted images. On diffusion-weighted images they both exhibit high signal intensity and low apparent diffusion coefficient (ADC) values which support the malignant nature of the thrombus and the mass.






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