Case challenge · Imaging / Fetal medicine / Pediatric neurosurgery · teaching

Fetal Arachnoid Cyst / Midline Cyst · case challenge

Given a case, work through the care pathway step by step; the tool checks each choice and scores you. Decisions and basis are taken from this site's reviewed care pathways.

← View the full flowchartBased on Fetal neuro MRI

Case #1Imaging / Fetal medicine / Pediatric neurosurgery

📋 Case data

Site + mass effect/hydrocephalus + differentiationMass effect causing ventricular dilation/obstructive hydrocephalus (quadrigeminal/suprasellar/posterior fossa)

Data is taken from this pathway's reviewed node text. Work through the pathway step by step.

Step 1 / 1 · Site + mass effect/hydrocephalus + differentiation

Site + mass effect/hydrocephalus + differentiation?

💡 Arachnoid cyst = a benign extra-axial CSF cyst, isointense to CSF on all sequences, no enhancement, not communicating with the ventricles/subarachnoid space; mass effect (displaces, does not destroy, adjacent structures). Mostly supratentorial (middle cranial fossa most common). Usually found after the second trimester.

For teaching. Decisions and their basis are taken from this site's reviewed care pathways; for licensed clinicians/trainees, this does not replace clinical judgment or local protocols.