title: Mastocytosis without urticaria pigmentosa: a frequently unrecognized cause of recurrent syncope.
mesh_terms: D006632:Histamine / Q000652:urine; D006801:Humans; D008875:Middle Aged; D011457:Prostaglandins D / Q000652:urine; D012008:Recurrence; D013575:Syncope / Q000209:etiology* / Q000652:urine; D013577:Syndrome; D014582:Urticaria Pigmentosa / Q000150:complications* / Q000652:urine
chemical_list: D011457:Prostaglandins D; C035860:9-hydroxy-11,15-dioxo-2,3,18,19-tetranorprost-5-ene-1,20-dioic acid; D006632:Histamine