Actinomycotic Infection of Spine – A Rare Disease with Diagnostic Challenge, an Update on Spinal Infection

INTRODUCTION: We are reporting a rare case of lumbar spinal actinomycosis with superficial discharging sinuses in an elderly female. CASE REPORT: A 56-year-old female came in outpatient with chief complaints of low back pain radiating to both buttocks, burning sensations to both lower limbs. Magnetic resonance imaging (MRI) re-vealed signal intensity changes suggestive of patchy marrow edema present over the L2 to S1 vertebra. Surgery was performed in the form of laminectomy and decompression by posterior approach and tissue was collected from right sacral ala. Contrast MRI showed patchy areas of marrow signal ab-normality L1, L2, L4, and L5 vertebra and adjoining end plates of L5, S1, and S2 segments. Ring en-hancing lesions at L2 and L3 levels. The patient underwent revision surgery. Histopathology revealed clumps of basophilic filamentous bacteria in a vaguely rosette-like configuration surrounded by acute inflammatory cells, characteristic of actinomycosis. CONCLUSION: Actinomycotic infections of spine are a rare cause of spinal infections but should be kept in mind once the tubercular infection is ruled out. The definitive diagnosis of actinomycosis can be made by finding actinomycetes in the pus from affected tissue.