Multisuture Craniosynostosis and Papilledema in Pycnodysostosis: A Paradox?

Area of Science:

• Genetics
• Skeletal Biology
• Pediatric Surgery

Background:

• Pycnodysostosis (PYCD) is a rare autosomal-recessive skeletal disorder characterized by osteosclerosis and osteolysis.
• It results from loss-of-function mutations in the CTSK gene, affecting osteoclast function.
• Craniosynostosis is an uncommon manifestation of PYCD.

Observation:

• A 6-year-old girl with PYCD presented with multisuture craniosynostosis (coronal and sagittal sutures).
• She also exhibited severe obstructive sleep apnea and papilledema due to raised intracranial pressure.
• This presentation is paradoxical given typical PYCD bone remodeling patterns.

Findings:

• The patient underwent frontofacial monobloc distraction advancement.
• This surgical intervention successfully corrected both the papilledema and obstructive sleep apnea.

Implications:

• This case demonstrates the successful surgical management of craniosynostosis in PYCD.
• It highlights the potential for significant improvement in associated respiratory and neurological symptoms.
• Understanding the genetic and cellular basis of PYCD may inform future treatment strategies for complex skeletal disorders.