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June 2020 — Clinical Microbiology & Infectious Disease

A 77 year old man presented with 6-8 weeks of right sided neck pain associated with a rapidly enlarging mass, fatigue, and night sweats. A fine needle aspiration of the 7.1 cm hypermetabolic mass showed acute and chronic inflammation. The diagnostic findings on histopathologic examination of an excisional biopsy are shown in the pictures below (Figure 1: H&E and Figure 2: GMS) and were consistent with findings on tissue culture and serologic studies. The patient reported frequent trips to Arizona.

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Photo of Rebecca Marrero Rolon, M.D., Fellow, Clinical Microbiology, Mayo Clinic Rebecca Marrero Rolon, M.D.
Fellow, Clinical Microbiology
Mayo Clinic
Photo of Bobbi Pritt, M.D.   Bobbi Pritt, M.D.
Division Chair, Clinical Microbiology
Mayo Clinic
Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine and Science
@ParasiteGal
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This post was developed by our Education and Technical Publications Team.