title: Idiopathic CD4 lymphocytopenia with giant cell arteritis and pulmonary mucormycosis.
abstract: Idiopathic CD4 lymphocytopenia (ICL) is characterized by a low CD4+ lymphocyte count in the absence of HIV or other underlying etiologies. We report a case of a 57-year old man with ICL and giant cell arteritis (GCA) who developed pulmonary mucormycosis, which, to our knowledge, is the first report of these occurring in a patient with ICL. Abnormally low total lymphocyte or CD4+ cell counts occurring in patients with autoimmune disorders should alert clinicians to the possibility of ICL. Immunosuppressive treatment should be used with caution in this context.
authors.affiliation: Medical Scientist Training Program, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
authors.forename: Ryan A
authors.initials: RA
authors.lastname: Denu
authors.affiliation: Department of Pathology and Laboratory Medicine, University of Wisconsin Hospital and Clinics, Madison, WI, USA.
authors.forename: Patrick S
authors.initials: PS
authors.lastname: Rush
authors.affiliation: Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
authors.forename: Sarah E
authors.initials: SE
authors.lastname: Ahrens
authors.affiliation: Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA ; Department of Population Health Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
authors.forename: Ryan P
authors.initials: RP
authors.lastname: Westergaard
keywords: Giant cell arteritis; Idiopathic CD4 lymphocytopenia; Mucormycosis