<prompt> A thirty-two-year-old adult male presents with a chronic suppurative lesion on the angle of the jaw. Microscopic examination shows small abscesses immediately beneaththe epidermis with moderate growth of epithelial cords. In the abscess, there are oval, unicellular organisms measuring 20 μm in diameter and having a thick, double-refractive cell wall and cytoplasm containing refractive granules and vacuoles. Which of the following is the most likely diagnosis?BlastomycosisForeign body reactionSyphilisTuberculosis  <response>: Blastomycosis is a relatively uncommon disease caused by the dimorphic fungus known as Blastomyces dermatitidis. These organisms are 8 to 20 μm in diameter. They are characterized by a doubly refractile cell wall and a broad attachment between the budding daughter cell and the parent cell. Ref: Nevilles oral and maxillofacial pathology 4th edition page 204 