For the second time my sister has an infection of the mediastinum. Both time went to ICU. They can not find the cause of the infection. Both times it manifested itself by a lump protruding from her neck. This time the found blood in her stool but can not check it out due to the present infection. And, her doctors tell her that the only specialist is in Australia. Can anyone give me some insight with this problem. We are all very concerned.