Smith-Lemli-Optiz syndrome: importance of ophthalmology referral and follow-up.

Smith-Lemli-Opitz syndrome (SLOS) is an autosomal recessive disorder caused by mutations in the 7-dehydrocholesterol reductase (DHCR7) gene, located on chromosomal region 11q13. This results in reduced cholesterol and increased 7-dehydrocholesterol (7DHC) levels. Accumulation of 7DHC in patients with SLOS can affect multiple organs and display a broad phenotypic expression. Ophthalmic abnormalities related to SLOS are variable but the most common is blepharoptosis. Over 50% of these patients present with self-injurious behavior, such as head banging, which can result in ocular complications and blindness. We report the first case of peripheral avascularity of the retina in a patient with SLOS. Physicians should be aware of the potential ocular complications associated with SLOS and confounding factors, such as prematurity, given that referral is usually delayed due to the lack of awareness of these potentially blinding associations. This case highlights the importance of early referral and continuous ophthalmologic follow-up in preventing further deterioration of visual development and complications that can lead to blindness.