<prompt> Subdural empyema is a complication of all the following conditions except?Frontal SinusitisSkull vault osteomyelitisMiddle ear diseaseBoil over face  <response>: d. Boil over faceRef: Nelsons 20e p 2936-2948, Ghai 8e p 563-565Infections of the sinuses, ear and skull bones can lead to Subdural empyema. 