Is there an hospital or centre (in England or France) specific for surgery of intracordal cyst (mucous ritention cyst)in singer?

Yes. Royal National Throat, Nose and Ear hospital. It's the UK centre for ENT surgery and the EU centre for audiologic care. http://www.uclh.nhs.uk/OurServices/OurHospitals/RNTNE/Pages/Home.aspx.

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