title: Absence of the thymic shadow in a neonate suspected of primary immunodeficiency: not a straightforward clinical sign of immunodeficiency.
authors.affiliation: Division of Allergic Diseases, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota.
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Nickels
authors.affiliation: Division of Pediatric Infectious Diseases, Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota.
authors.forename: Thomas
authors.initials: T
authors.lastname: Boyce
authors.affiliation: Division of Pediatric Allergy and Immunology, Department of Pediatric, Mayo Clinic, Rochester, Minnesota; Division of Allergy Diseases, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota.
authors.forename: Avni
authors.initials: A
authors.lastname: Joshi
authors.affiliation: Division of Allergic Diseases, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota.
authors.forename: John
authors.initials: J
authors.lastname: Hagan
mesh_terms: D006801:Humans; D007223:Infant; D008297:Male; D011859:Radiography; D016511:Severe Combined Immunodeficiency / Q000175:diagnosis*; D013950:Thymus Gland / Q000000981:diagnostic imaging* / Q000473:pathology