title: Anatomical variants and pathologies of the vermix.
abstract: The appendix may demonstrate a perplexing range of normal and abnormal appearances on imaging exams. Familiarity with the anatomy and anatomical variants of the appendix is helpful in identifying the appendix on ultrasound, computed tomography, and magnetic resonance imaging. Knowledge of the variety of pathologies afflicting the appendix and of the spectrum of imaging findings may be particularly useful to the emergency radiologist for accurate diagnosis and appropriate guidance regarding clinical and surgical management. In this pictorial essay, we review appendiceal embryology, anatomical variants such as Amyand hernias, and pathologies from appendicitis to carcinoid, mucinous, and nonmucinous epithelial neoplasms.
authors.affiliation: The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, 601 N. Caroline Street, Baltimore, MD, 21287, USA.
authors.forename: Swati
authors.initials: S
authors.lastname: Deshmukh
authors.forename: Franco
authors.initials: F
authors.lastname: Verde
authors.forename: Pamela T
authors.initials: PT
authors.lastname: Johnson
authors.forename: Elliot K
authors.initials: EK
authors.lastname: Fishman
authors.forename: Katarzyna J
authors.initials: KJ
authors.lastname: Macura
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D063405:Anatomic Variation; D001063:Appendiceal Neoplasms / Q000473:pathology; D001064:Appendicitis / Q000473:pathology; D001065:Appendix / Q000033:anatomy & histology* / Q000098:blood supply / Q000000981:diagnostic imaging / Q000196:embryology / Q000473:pathology*; D002276:Carcinoid Tumor / Q000473:pathology; D003952:Diagnostic Imaging; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography