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Exuberant juvenile hyaline fibromatosis in two patients

Mariela Leão Muniz1, Alice Zoghbi Coelho Lobo, Maria Cecília da Matta Rivitti Machado

  • 1Department of Dermatology, Hospital das Clínicas, University of São Paulo School of Medicine, São Paulo, Brazil.

Pediatric Dermatology
|October 4, 2006
PubMed

Insights

Juvenile hyaline fibromatosis and infantile systemic hyalinosis are rare genetic disorders characterized by hyaline material deposition. Recent findings suggest they are part of a single disease spectrum, impacting skin, joints, and bones.

Area of Science:

  • Genetics
  • Pathology
  • Pediatrics

Background:

  • Juvenile hyaline fibromatosis (JHF) and infantile systemic hyalinosis (ISH) are rare autosomal recessive disorders.
  • Both conditions present in infancy/early childhood with hyaline material deposition in tissues.

Observation:

  • Key clinical features include papulo-nodular skin lesions, gingival hypertrophy, joint contractures, and bone abnormalities.
  • ISH exhibits a more severe phenotype with visceral involvement and high mortality.
  • Recent genetic studies identified mutations in the same gene for both JHF and ISH.

Findings:

  • Two new unrelated patients diagnosed with JHF/ISH are presented.
  • Detailed clinical, histopathologic, immunohistochemical, and ultrastructural data are provided.
  • The findings support JHF and ISH as part of a single disease spectrum.

Implications:

  • Understanding the shared genetic basis refines diagnostic criteria for these rare disorders.
  • Further research into pathogenesis and treatment strategies is warranted.
  • This spectrum concept aids in predicting clinical outcomes and guiding management.

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