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Clinical presentation of exclusive cystic fibrosis lung disease
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Abstract

The diagnosis of cystic fibrosis (CF) is based on the occurrence of two mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene and on assays that measure the basic defect of abnormal chloride transport in the affected organs. However, in cases of atypical CF not all diagnostic tests may be positive. We present a patient with an atypical CF phenotype in whom the only presenting symptom was severe CF-like lung disease substantiated by an abnormal nasal potential difference. Genetic analysis showed that the patient was a symptomatic heterozygote, which suggests that one lesion in theCFTR gene may be sufficient to cause CF-like lung disease.

  • cystic fibrosis
  • atypical cystic fibrosis
  • nasal potential difference
  • genetics
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