Actinomycosis - Left Post Chest Wall.

A forty year old female of weak body built presented with recurring small hard lumps in let posterior chest wall for 3 years and discharging ulcers for 3 months duration. Clinically, the provisional diagnosis was malignancy with secondary infection. FNAC showed features suggestive of dysplasia but histopathology confirmed the diagnosis as actinomycosis. The present case is reported due to rare incidence of actinomycosis at post chest wall with muscle involvement.