Need help understanding Heart CT and Residual Thymus tissue found?

[bruin27]

So just had my CT Scan for Calcium score, here are the results, I have a follow up appt with my cardiologist next week but the soft tissue part is freaking me out.. What does that mean? I'm 31 years old, history of heart disease in my family so I wanted to get this test done; I feel good about the 0 calcium score but what the heck are these other findings?

MORPHOLOGY:  
Heart size is within normal limits. There is no pericardial fluid
or pericardial thickening. The coronary circulation appears
either left dominant or codominant. Coronary origins are normal.  

CARDIOVASCULAR MEASUREMENTS  
Ascending aorta: 27 mm
Descending aorta: 20 mm.
Main pulmonary artery: 25 mm
Calcium Score: 0.0, which places the patient in the
0-percentile rank for similar aged males.

THORACIC FINDINGS

MEDIASTINUM:  
No adenopathy. Soft tissue within the superior, anterior prevascular space is noted and suggestive of residual thymus
tissue.

LUNGS AND PLEURA:  
No nodules or masses evident within the visualized lung parenchyma. Minimal, bilateral dependent atelectasis are present.
There is no pleural effusion or pleural abnormalities in these
limited views.  

SUBCUTANEOUS TISSUES:  
No focal abnormality of the visualized subcutaneous soft tissues.


OSSEOUS STRUCTURES:  
Visualized osseous structures are within normal limits.

UPPER ABDOMEN:  
Limited views of the upper abdomen are without focal abnormality.

[bruin27]

I should also note, I have hasimotos disease, not sure if that has any impact on these findings