Progressive osseous heteroplasia in a 10-year-old male child

Area of Science:

• Genetics
• Pediatrics
• Orthopedics

Background:

• Progressive osseous heteroplasia (POH) is a rare genetic disorder characterized by progressive ossification of soft tissues.
• It presents in childhood and must be differentiated from other heterotopic ossification conditions like fibrodysplasia ossificans progressiva.
• The genetic basis involves mutations in the GNAS1 gene.

Purpose of the Study:

• To report a sporadic case of POH in a pediatric patient.
• To highlight the diagnostic challenges and genetic underpinnings of POH.
• To emphasize the importance of distinguishing POH from other ossification disorders.

Main Methods:

• Case report of a 10-year-old male with POH.
• Review of clinical presentation, including ossification of skin and deep connective tissues.
• Discussion of the genetic cause, GNAS1 mutation, and inheritance patterns.

Main Results:

• The patient exhibited progressive ossification and restricted range of motion.
• The underlying cause was identified as a paternally inherited inactivating GNAS1 mutation.
• POH is typically sporadic, with rare familial transmission, suggesting autosomal dominant inheritance with possible mosaicism.

Conclusions:

• POH presents with significant morbidity, including progressive ossification and functional limitation.
• Accurate diagnosis is crucial to differentiate POH from other pediatric heterotopic ossification syndromes.
• The condition has a poor prognosis and a high likelihood of recurrence after surgical excision.