<prompt> Life threatening complications of diabetes mellitus are all except -Malignant otitis externaRhinocerebral mucormycosisEmphysematous pyelonephritisEmphysematous appendicitis  <response>: Ans is option 4 - Emphysematous appendicitis It is not a fatal complication of DM. malignant otitis externa or invasive or necrotising otitis externa is life threatening in elderly diabetic and immunocompromised patients. Rhinocerebral mucormycosis is a life threatening fungal infection develops in DM patients. Emphysematous pyelonephritis is rapidly progressing with accumulation of fermentive gases in kidney and perinephritic tissues and life threatening. Ref Harrison 16 186, 189,1720 