perianal hematoma SNOMEDCT_2010_1_31:157525008 External thrombosed haemorrhoids ICD9CM:455.4 SNOMEDCT_2010_1_31:26373009 SNOMEDCT_2010_1_31:155474006 DOID:9745 SNOMEDCT_2010_1_31:211490002 UMLS_CUI:C0155784 Thrombosed external hemorrhoids SNOMEDCT_2010_1_31:269372002 disease_ontology hemorrhoid