1-The main bulk of the lesion is seen in the mediastinum.
2-Lesion arising from a mediastinal structure.
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| Thymoma arising from thymus gland |
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| Ascending aneurysm arising from aorta |
3-Cause obtuse angle with mediastinal border(weak rule).
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| A mass causing obtuse angle with mediastinal border is a mediastinal mass. |
4-A mass making contact with mediastinal border is a mediastinal mass (weak rule ).
5-Finally, at certain time, you will not be able to say if this mass is a lung mass or mediastinal one.
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