Actinomycosis in the mandible: CT and MR findings.Mandibular actinomycosis is an uncommon disease.  We retrospectively reviewed 6 patients with pathologically proven mandibular actinomycosis who underwent both CT and MR imaging to evaluate the characteristic imaging findings.  CT results showed an irregularly marginated lesion with increased bone marrow attenuation, osteolysis, and involvement of the skin in all patients.  Periosteal reaction and intralesional gas were seen in 4 patients.  Familiarity with the imaging findings of mandibular actinomycosis may help to diagnosis this entity.
CT
Actinomycosis in the mandible: CT and MR findings.Mandibular actinomycosis is an uncommon disease.  We retrospectively reviewed 6 patients with pathologically proven mandibular actinomycosis who underwent both CT and MR imaging to evaluate the characteristic imaging findings.  MR imaging results revealed low signal on T1-weighted and high signal on T2-weighted images of the mandible, and moderate heterogeneous enhancement was seen in all patients who received intravenous contrast. 
MR