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Pyknodysostosis

“ This is an autosomal recessive disease that is often diagnosed early in childhood. Patients present with growth retardation/dwarfism, micr...

This is an autosomal recessive disease that is often diagnosed early in childhood. Patients present with growth retardation/dwarfism, micrognathia, dystrophic nails and characteristic facies (beaked nose, receding jaw and yellowed teeth).
APPENDICULAR X-RAY

•  Generalised increased density to the long bones (but medullary cavity is spare, unlike in osteopetrosis).
•  Thickened bone cortex.
•  Multiple healing fractures of varying ages.
•  Short distal phalanges.

FACIAL BONES X-RAY

•  Hypoplastic facial bones and sinuses
•  Wormian bones
•  Brachycephaly
•  Widened sutures

CHEST X-RAY

•  Resorption of the lateral ends of the clavicles