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Table 4 ORPHANET Classifications

From: The context for the thematic grouping of rare diseases to facilitate the establishment of European Reference Networks

Rare cardiac diseases  
Developmental anomalies during embryogenesis  
Inborn errors of metabolism  
Rare gastroenterological diseases  
Rare neurological diseases  
Rare abdominal surgical diseases  
Rare hepatic diseases  
Rare respiratory diseases  
Rare urogenital diseases  
Rare surgical thoracic diseases  
Rare skin diseases  
Rare renal diseases  
Rare eye diseases  
Rare endocrine diseases  
Rare haematological diseases  
Rare immunological diseases  
Rare systemic and rheumatologic diseases  
Rare odontological diseases  
Rare circulatory system diseases  
Rare bone diseases  
Rare otorhinolaryngological diseases  
Rare infertility disorders  
Rare tumours  
Rare infectious diseases  
Rare intoxications  
Rare gynaecological and obstetric diseases  
Rare surgical maxillo-facial diseases  
Rare allergic disease  
Teratological disorders  
Rare cardiac malformations  
Rare genetic diseases  
  1. Legend: Each of these headings represents a separate and more exhaustive classification. (http://www.orphadata.org/cgi-bin/inc/product3.inc.php)