Fibrous Dysplasia – DNB ENT Theory Question June 2015

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June 2015 – 5 – a) Pathology & Types of Fibrous Dysplasia. b) Outline its management. (3+4+3)

Fibrous dysplasia:

  • Genetically based tumor-like condition (not a true neoplasm).
  • Normal medullary bone is replaced with fibro-osseous tissue.
  • Commonly diagnosed within the first two decades of life.
  • Self-limiting process and ceasing when affected bone reaches maximum growth and maturation.
  • Reported cases of sarcomatous transformation.
  • Juvenile variant:
    o Rapidly destructive, aggressive, destroys teeth, refractory to treatment.
fibrous dysplasia 225x160 1
fibrous dysplasia 225×160 1

Types:

  1. Monostotic: 70-80%
     One bone involved.
     Most common form.
  2. Polyostotic: 20-25 %
     More than one bone involved.
  3. Disseminated (McCune-Albright Syndrome):
     Polyostotic fibrous dysplasia, precocious puberty,
    abnormal skin pigmented lesions (caft-au-lait).

Clinical picture:

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