<prompt> In actinomycosis of the spine, the abscess usually erodes into which of the following structures?Towards the skinInterveebral discInto the pleural cavityInto the reteropritoneal space  <response>: Actinomycosis is most commonly caused by Actinomyces israelii. It is characterized by the presence of abscess with sinus tracts leading to the skin. Ref: Diagnostic Radiology : Musculo-Skeletal and Breast Imaging By Jaypee Brothers, 2nd Edition, Page 141. 