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A simple bone cyst containing secretory cells in its lining membrane in a patient with polyostotic fibrous dysplasia

H Kitoh1, H Nogami

  • 1Department of Genetics, Institute for Developmental Research, Aichi Prefectural Colony, 713-8 Kamiya-Cho, Kasugai, Aichi 480-0392, Japan.

Pediatric Radiology
|June 17, 1999
PubMed

Insights

A rapidly expanding cystic lesion in an 11-year-old boy with polyostotic fibrous dysplasia was found to be filled with serous fluid and lined by a fibrous membrane. This membrane contained mesenchymal cells with secretory granules, suggesting a unique cellular response in fibrous dysplasia.

Area of Science:

  • Orthopedic Oncology
  • Skeletal Dysplasias
  • Cellular Biology

Background:

  • Polyostotic fibrous dysplasia is a rare genetic disorder characterized by the replacement of normal bone with fibrous tissue.
  • Rapid expansion of bone lesions can occur, posing diagnostic and therapeutic challenges.

Observation:

  • An 11-year-old boy with severe polyostotic fibrous dysplasia presented with a rapidly expanding cystic lesion in his humerus.
  • Biopsy revealed a thin bone shell, a cavity filled with serous fluid, and a hypertrophic fibrous membrane.

Findings:

  • Histological examination showed features of fibrous dysplasia within the fibrous capsule.
  • Ultrastructural analysis identified numerous secretory granules in cytoplasmic vacuoles of capsular and cultured cells.

Implications:

  • The findings suggest a potential secretory function of the fibrous capsule in this form of fibrous dysplasia.
  • Further research into the cellular mechanisms of fibrous dysplasia expansion and fluid accumulation is warranted.

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