The defect is the weakness and gap in the wall of the abdomen in that region which is usually formed by the muscles,fascia and thick fat-skin layers. This defect may be caused due to old surgery in that region or by some accidental trauma or due to some muscle weakness
. So in your case some loops of food pipe are coming out through this defect and are lying under the skin. It is abnormal. However the CT shows that they are not obstructed or stuck there. That is good. However you must undergo surgery to close that defect and keep back the loops of food pipe inside the stomach. Or else sometimes the loops may get obstructed/stuck and you may have sever pain and may require emergency surgery. Better selectively plan and get it done now. Consult a surgeon.
The solid foci in the splenic bed could be splenunculus, which are normal spleen
like tissue adjacent to the native spleen. They are normal findings and you need not worry. However if they have increased in size or you have any problem relating to that, then you may need to get few more studies and confirm it.