To recall the epidemiology and demographic characteristics of posterior fossa cystic lesions. 2.
To review MRI imaging characteristics of the most common posterior fossa cystic lesions in children. 3.
To describe the differential diagnosis of posterior fossa cystic lesions both benign and malignant based on age of onset and provoking factor.
Background: Posterior fossa cystic lesions are common findings observed in the pediatric population.
The most accurate method to evaluate posterior fossa is Magnetic Resonance Imaging (MRI),
where the sensitivity and specificity is far superior to those of Computed Tomography (CT) and transfontanellar ultrasound of neonates and infants.
There is a wide range of pathologies that need to be accounted in the evaluation of posterior fossa cystic lesions.
They can range from normal variants to...
Findings and procedure details
Results and discussion: All posterior fossa cystic lesions observed in our pediatric patients can by divided into congenital and acquired abnormalities.
Congenital cystic lesions include: arachnoid cyst (16 cases),
Dandy-Walker malformation (2 cases) and Dandy Walker variants (8 cases),
mega cisterna magna (46 cases),
Blake's pouch cyst (7 cases) and Joubert syndrome (2 cases).
Acquired cystic lesions include both neoplasm associated cysts - pilocytic astrocytoma (8 cases),
Neuroimaging provides detailed anatomic findings and plays a key role in the diagnosis of posterior fossa abnormalities.
In the clinical practice the added value of MRI is substantial,
while other imaging techniques such as transfontanellar ultrasound or CT are inferior to MRI.
The presented overview should help in proper and easier differential diagnosis of the commonest posterior fossa cystic lesions in the pediatric group of patients.
Zimny. Department of General and Interventional Radiology and Neuroradiology,
Wroclaw Medical University,
Poland. tel.: 71 733 16 68,
faks: 71 733 16 89. Malgorzata Neska-Matuszewska,
pathology and anatomy.
Philadelphia 2017. 2.Bosemani T,
Congenital abnormalities of the posterior fossa.
RadioGraphics 2015; 35:200-220. 3.Neska-Matuszewska M,
Role of diffusion and perfusion MR imaging in differentiation of haemangioblastomas and pilocytic astrocytomas.
Pol J Radiol.