Related Experiment Video
Updated: Jul 13, 2026

Electroretinogram Recording for Infants and Children under Anesthesia to Achieve Optimal Dark Adaptation and International Standards
Published on: September 3, 2020
Red ear syndrome
R Allan Purdy1, David W Dodick
1Division of Neurology, Department of Medicine, Dalhousie University, QEII Health Sciences Center, Halifax, Nova Scotia, B3H 3Y9, Canada. a.purdy@dal.ca
Abstract:
The red ear syndrome is a rare syndrome originally described by Lance in 1994. It involves pain in and around the ear and associated autonomic phenomena, the most significant of which is cutaneous erythema of the ear ipsilateral to the pain and obvious to the patient and examiner during the attack. It may well represent an auriculo-autonomic cephalgia and/or be part of the group of disorders recognized as trigeminal autonomic cephalalgias. As a syndrome, it still lacks specificity in regard to etiology, mechanisms, and treatment but is important to recognize clinically because of its associations.
Related Concept Videos
Photoreceptors and Visual Pathways
Disorders of Erythrocytes
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies
Rheumatic Heart Disease I: Introduction

