title: 57-year-old man with flushing and fainting.
authors: Mayo School of Graduate Medical Education, Mayo Clinic, Scottsdale, AZ 85259, USA.
authors: Rayya A
authors: RA
authors: Saadiq
authors: Elizabeth B
authors: EB
authors: Windgassen
mesh_terms: D003937:Diagnosis, Differential; D005483:Flushing / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D008297:Male; D034721:Mastocytosis, Systemic / Q000175:diagnosis* / Q000188:drug therapy; D008875:Middle Aged; D013575:Syncope / Q000175:diagnosis / Q000209:etiology*