If left untreated, fibrosing mediastinitis may progress to sepsis and subsequently, death.  Mortality rates related to mediastinitis vary, though some estimates predict rates greater than 60%.  Common complications of mediastinitis include sepsis and pneumonia.
What is mediastinitis, and what are its natural progression, possible complications, and expected outcome?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: What is mediastinitis, and what are its natural progression, possible complications, and expected outcome? [/INST] \n If left untreated, fibrosing mediastinitis may progress to sepsis and subsequently, death.  Mortality rates related to mediastinitis vary, though some estimates predict rates greater than 60%.  Common complications of mediastinitis include sepsis and pneumonia.</s>