Cavum septum pellucidum cysts.

J Neurosurg

Published: August 1997

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Prenatally Diagnosed Absent Septum Pellucidum and Septo-Optic Dysplasia: A Narrative Review and Practical Recommendations for Pediatric Neurologists.

Pediatr Neurol

December 2024

Division of Neurology & Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania; Division of Neurology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.

Evaluation of the cavum septum pellucidum is required in standard second-trimester screening fetal anatomy ultrasound scans. The absence of septum pellucidum triggers further evaluation and referral for subspecialty counseling. Absence of septum pellucidum is linked to other midline anomalies including septo-optic dysplasia.

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We report a 28-year-old G2P0 at 24 weeks 5 days who presented for evaluation secondary to suspected skeletal dysplasia in her fetus. Fetal ultrasound imaging demonstrated foreshortened long bones by 9-10 weeks, multiple bowing deformities and fractures, 11 foreshortened paired ribs with fractures, decreased skull mineralization, frontal bossing, enlarged cavum septum pellucidi, and severe fetal growth restriction (< 2%). Findings were concerning for life limiting condition with thoracic circumference < 2.

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Article Synopsis
  • The study aimed to evaluate the visibility of the fetal optic chiasm and optic tracts through ultrasound and establish reference values for mid-trimester fetuses.
  • It included 154 normal fetuses at 19-23 weeks of gestation, measuring various dimensions using a specific ultrasound technique, successfully visualizing OC and OTs in 70.8% of cases.
  • Results showed that the dimensions of OC and OTs were positively correlated with measurements of the cavum septum pellucidum, as well as other growth indicators like biparietal diameter and head circumference.
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