Posterior polymorphous dystrophy and keratoglobus in a child.

Area of Science:

• Ophthalmology
• Corneal Diseases
• Genetics

Background:

• Posterior polymorphous dystrophy (PPMD) is a rare, inherited corneal dystrophy.
• Keratoglobus is a non-progressive corneal thinning disorder.
• Both conditions can lead to significant visual impairment.

Observation:

• A 13-year-old male presented with progressive vision loss, photophobia, and headaches.
• Clinical examination revealed characteristic signs of both PPMD and keratoglobus.
• Anterior segment imaging and specular microscopy confirmed the diagnoses.

Findings:

• This case represents the first documented pediatric instance of simultaneous posterior polymorphous dystrophy and keratoglobus.
• The simultaneous presentation of these two distinct corneal pathologies is exceedingly rare, with only one prior reported case overall.
• The combined findings suggest a potential, though unproven, shared etiology or predisposition.

Implications:

• This case highlights the importance of considering co-existing corneal conditions in pediatric patients with unexplained visual decline.
• Further research may elucidate shared genetic or developmental pathways contributing to the simultaneous occurrence of PPMD and keratoglobus.
• Understanding this rare association can inform diagnostic approaches and future management strategies for affected individuals.