title: Rickets as an unusual initial presentation of abetalipoproteinemia and hypobetalipoproteinemia.
abstract: OBJECTIVE
  Description of rickets as an unexpected initial manifestation in two children with abetalipoproteinemia and hypobetalipoproteinemia, and elucidation of its pathophysiology in these conditions.
  
  
  METHODS
  Two infants aged two and six months with abetalipoproteinemia and hypobetalipoproteinemia respectively had clinical rickets at presentation, confirmed radiologically and biochemically. Vitamin D intake and serum levels were measured and other causes of rickets were looked for.
  
  
  RESULTS
  Vitamin D intake and laboratory studies levels were suggestive of rickets due to calcium deficiency instead of vitamin D deficiency. Healing of rickets occurred with dietary treatment of the malabsorption, without any dietary calcium or significant vitamin D supplementation.
  
  
  CONCLUSIONS
  Steatorrhea-induced calcium malabsorption seems to be the most likely cause of rickets in this entity.
authors: Pediatric Unit, Saudi Aramco Al-Hasa Health Center, Saudi Arabia. hassibnarchi@hotmail.com
authors: H
authors: H
authors: Narchi
authors: S S
authors: SS
authors: Amr
authors: P M
authors: PM
authors: Mathew
authors: M R
authors: MR
authors: El Jamil
mesh_terms: D000012:Abetalipoproteinemia / Q000150:complications* / Q000378:metabolism; D002118:Calcium / Q000378:metabolism; D005260:Female; D006801:Humans; D006995:Hypobetalipoproteinemias / Q000150:complications* / Q000378:metabolism; D007223:Infant; D008286:Malabsorption Syndromes / Q000150:complications / Q000378:metabolism; D008297:Male; D012279:Rickets / Q000150:complications* / Q000209:etiology / Q000378:metabolism
chemical_list: D002118:Calcium