Juan E. Small, MD is the Section Chief of the Neuroradiology Division and the Director of Neuroimaging Education at Lahey Hospital and Medical Center in Burlington, Massachusetts. He is the lead author of Neuroradiology: Key Differential Diagnoses and Clinical Questions. Dr. Small joined Lahey in 2009 after completing his medical degree at Harvard Medical School in Boston; a Master's in Neuroscience at the University of Oxford; a radiology residency at Brigham and Women's Hospital; and a neuroradiology fellowship at Massachusetts General Hospital in Boston. Dr. Small is board certified in diagnostic radiology and neuroradiology. Dr. Pamela Schaefer is an associate radiologist and associate director in the Division of Neuroradiology, clinical director of MRI services in the Department of Radiology and program director of the Neuroradiology Fellowship at Massachusetts General Hospital.

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• Section I BRAINParenchymal Hemorrhage and Trauma1. Brain Parenchymal Hematoma 2. Subdural Hemorrhage and Post-traumatic Hygroma Disorders of Cerebral Vascular Autoregulation3. Posterior Reversible Encephalopathy SyndromeArteriopathy4. Cerebral Amyloid AngiopathyMetabolic Disorders5. Wernicke Encephalopathy6. Central Pontine MyelinolysisInfection7. Herpes Simplex Encephalitis 8. Toxoplasmosis9. NeurocysticercosisAutoimmune/Inflammatory Disorders10. Acute Disseminated Encephalomyelitis11. Autoimmune Encephalitis12. Progressive Multifocal Leukoencephalopathy13. Immune Reconstitution Inflammatory Syndrome14. NeurosarcoidosisTumors15. Glial Tumors16. HemangioblastomaVentricular System Alterations17. Intracranial Hypotension18. Intracranial HypertensionPituitary Abnormalities19. Partially Empty Sella20. Rathke's Cleft Cyst 21. Pituitary ApoplexyNeurodegenerative Disease22. Hypertrophic Olivary DegenerationSection II SPINEDegenerative Disease23. Ossification of the Posterior Longitudinal Ligament 24. Lumbar Interbody FusionPost-traumatic Effects25. Kummel's DiseaseInfection26. Discitis-Osteomyelitis 27. Tuberculous Spinal InfectionBone Lesions28. Chordoma29. Vertebral HemangiomaCord Lesions30. Syringohydromyelia31. Cord Infarct32. Subacute Progressive Ascending MyelopathyCord Tumors33. Spinal Cord Ependymoma34. AstrocytomaSpine Deformity35. Hiryama36. Thoracic WebSection III HEAD AND NECKInfection37. Orbital Infection38. Suppurative Thyroiditis Inflammatory Disorders39. Thyroid-Associated Orbitopathy 40. IgG4-Related Disease in the head and neck41. Sjogren's42. Cholesteatoma43. Labyrinthitis Tumors44. Paraganglioma45. EsthesioneuroblastomaPost-traumatic Effects46. Vocal Cord AugmentationBone Lesions47. Otospongiosis48. Paget's Vascular Lesions49. Carotid Blowout Syndrome