A rare bacterium isolated from a breast abscess on sebaceous cyst: Gleimia europaea

Breast abscesses developing on pre-existing sebaceous cysts are exceptionally rare. Actinomyces species are infrequently isolated as primary pathogens in breast abscesses. As part of the human commensal flora, these bacteria can cause opportunistic chronic infections, often presenting with a granulomatous and slowly progressive clinical course. Gleimia europaea (formerly Actinomyces europaeus), a rare causative agent of actinomycosis, has been infrequently reported in clinical infections. In this case report, we discuss an unusual instance of a breast abscess caused by G. europaea, arising in the background of a pre-existing sebaceous cyst.