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Radiopaedia.org is a free educational radiology resource with one of the web's largest collections of radiology cases and reference articles.

Case of the Day

Achalasia - with bird beak sign

Contributed by Dr Andrew Ho

Achalasia can be divided into primary and secondary (pseudoachalasia): primary achalasia is a smooth muscle motility disorder of the esophagus. secondary achalasia is abnormal stricturing of the gastroesophageal junction, such as tumor compression or Chagas disease. Esophagram is...

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Radiopaedia is a rapidly growing open-edit educational radiology resource which has been primarily compiled by radiology residents / registrars / fellows and consultants from across the world. The site's collective aim is to create the best radiology reference available, and to make it available for you for free and forever.. read more.

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general guide - basic principles in understanding the workings and structure of this site
getting started - simple ways in which you can look after this site
where your help or expertise may be most needed
articles - how to create and refine article content through time
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