Filar cysts (FCs) can be detected using ultrasound before or after delivery. They usually present as anechoic structures with a clear boundary just caudal to the lower end of the conus medullaris. They are generally considered a physiological variation and do not affect health. Some studies have pointed out that FCs in children can disappear spontaneously, as identified by ultrasound or magnetic resonance imaging. Three cases of FCs diagnosed by prenatal transabdominal ultrasound were reported in this study, and it was observed that FCs could disappear spontaneously in utero. The shortest time of disappearance was 4 weeks.
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Utility of routine mid-trimester fetal ultrasound scan in detecting filar cysts and follow-up outcomes.
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Department of Ultrasound Medicine, China-Japan Friendship Hospital, 2 Yinghua East Street, Chaoyang District, Beijing, China.
Purpose: To assess the value of routine mid-trimester fetal ultrasound scans in detecting FCs, as well as the related ultrasound and clinical follow-up outcomes.
Methods: A retrospective analysis was conducted on 1064 fetuses who underwent standardized ultrasound screening during the mid-trimester. During the examination, high-frequency ultrasound was used to examine the fetal spine.
Prenatal ultrasound diagnosis and prognosis of fetus with isolated filar cyst: a retrospective analysis.
Front Med (Lausanne)
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Department of Ultrasound, Chongqing Health Center for Women and Children, Women and Children's Hospital of Chongqing Medical University, Chongqing, China.
Objective: This study aimed to investigate the prenatal ultrasonographic diagnosis and prognosis of fetuses with isolated filar cysts (FCs).
Methods: The ultrasonographic features, reasons for missed diagnosis, and prognosis of eight isolated FCs diagnosed using ultrasound were analyzed retrospectively through follow-up.
Results: Eight isolated FCs showed round or fusiform cystic anechoic areas at the end of the conus medullaris.
Sacral terminal filar cyst: a distinct variant of spinal meningeal cyst and midterm clinical outcome following combination resection surgery.
Front Surg
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Department of Neurosurgery, Peking University Third Hospital, Beijing, China.
Objective: Spinal meningeal cysts (SMCs) are currently classified into three types: extradural cysts without nerve root fibers (Type I), extradural cysts with nerve root fibers (Type II), and intradural cysts (Type III). However, the sacral terminal filar cyst is a distinct subtype with the filum terminale rather than nerve roots within the cyst. This study aimed to investigate the clinicoradiological characteristics and surgical outcomes of sacral terminal filar cysts.
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J Med Case Rep
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Department of Pathology, University of Iowa Hospitals & Clinics and Stead Family Children's Hospital, Iowa City, IA, USA.
Background: Filar cysts are frequently found on neonatal ultrasound and are physiologically involuting structures with natural resolution. Hence, there has been no previous histologic correlation. Ventriculus terminalis is a focal central canal dilation in the conus medullaris and usually not clinically significant.
View Article and Find Full Text PDFSpontaneous Disappearance of Filar Cysts Diagnosed by Transabdominal Ultrasonography: A Report of Three Cases.
J Ultrasound Med
April 2022
Department of Ultrasound, China-Japan Friendship Hospital, Beijing, China.
Filar cysts (FCs) can be detected using ultrasound before or after delivery. They usually present as anechoic structures with a clear boundary just caudal to the lower end of the conus medullaris. They are generally considered a physiological variation and do not affect health.
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