This episode includes:-Rheuminders from the previous episode on IgG4-RD classification criteria-Primer on relapsing polychondritis-Discussion of a new paper (see below) describing 3 clinical subtypes of relapsing polychondritisReference: Ferrada M, Rimland CA, Quinn K, Sikora K, Kim J, Allen C, Sirajuddin A, Goodspeed W, Chen M, Grayson PC. Defining Clinical Subgroups in Relapsing Polychondritis: A Prospective Observational Cohort Study. Arthritis Rheumatol. 2020 Apr 6. doi: 10.1002/art.41270. Epub ahead of print. PMID: 32249511.Intro and Outro music: Cheery Monday by Kevin MacLeodLink: https://incompetech.filmmusic.io/song/3495-cheery-mondayLicense: http://creativecommons.org/licenses/by/4.0/