The IOOG Categorisation of Tympanomastoid Surgery, also known as the SAMEO-ATO Scheme is subdivided into the SAMEO Framework for Mastoid Surgery and the ATO Framework for Middle Ear Surgery as summarised below. The full documents and user guide can be downloaded as PDF files here. 

​

If you use the Epic electronic medical record platform, a user guide on how to integrate this classification onto an operative note is available here.