Addressing the Challenges of Eosinophilia and Mastocytosis.

From the Division of Hematopathology, Mayo Clinic, Phoenix, AZ; Division of Hematopathology, Mayo Clinic, Rochester, MN; Department of Pathology, University of Utah School of Medicine, Salt Lake City; Institute of Pathology, University of Munich (LMU), Munich, Germany; Department of Pathology, Texas Tech University Health Sciences Center, P. L. Foster School of Medicine, El Paso; Institute of Pathology and Neuropathology, Eberhard Karls University of Tübingen and Comprehensive Cancer Center, Tübingen University Hospital, Tübingen, Germany; and Department of Hematopathology, MD Anderson Cancer Center, Houston, TX.