Akademik Veri Yönetim Sistemi
ECR 2023, Vienna, Avusturya, 28 Şubat - 05 Mart 2023, ss.3-5
Purpose: The purpose of the study is to evaluate MRI
findings of middle fossa arachnoid cysts in children according to Galassi
classification and determine the diferences between types and to assess the
morphological changes in cysts during follow-up imaging.
Methods: MR images of 266 middle fossa arachnoid
cysts of 255 pediatric patients were evaluated by two experienced radiologists
retrospectively. MRI features including the sidedness of the cyst, Galassi
type, parenchymal compression findings (cortical fattening and white matter
compression), bone remodeling, and midline shift were evaluated on axial T2-
and T1-weighted images. Follow-up MRI and available CSF flow MR imaging data
were evaluated for change in cyst size and cisternal connections, respectively.
Results: The most common type was type 1 according to
Galassi classification. The accompanying bone remodeling and white matter
compression had a higher incidence in Galassi type 2 and 3 groups than Galassi
type 1. Mean age of patients with bone remodeling and white matter compression
was significantly higher in patients with Galassi type 1. All patients with
cyst enlargement were younger than 2 years of age, and all of them were
Galassi type 1. Cisternal connection was demonstrated in 7 patients.
Conclusion: While
parenchymal compression and bone remodeling are expected findings in Galassi
type 2 and 3 cysts, these features can also be seen in smaller Galassi type 1
cysts, regardless of size. Most of the middle fossa arachnoid cysts remain
stable on follow-up imaging, and the increase in size is not an expected
fnding, especially in older children