I am not sure, if one can say that it is absolutely nothing to worry. It will also depend on your symptoms and clinical findings and results of other investigations. The lesions can be just of inflammatory pathology but malignancy or lymphoma (with an added lesion in spleen) would be ruled out only by biopsy.
Hope this helps. Please feel free, if you have further queries.
With these additional findings following inferences can be drawn:
1) Lungs seem to be fine.
2) Heart shadows don't show any abnormality.
3) Minimal anterior pericardial fluid can be of no significance. But may be associated with sympathetic effusion.
4) Spleen lesion can be just nothing or simple hemartomas, which are congenital blood vessel abnormalities and clinically of no consequence.
5) Small splenule is normal accessory spleen found in many people.
6) Osseous structures and bony cage are normal.
Hope this helps.
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