Definition of cyst types
| Cyst type | Sex | Age, reason for presentation | Cyst characteristics | Associated anomalies |
|---|---|---|---|---|
| Type 1: Communication with ventricles | ||||
| 1a | M | Neonate, macrocephaly | Isointense to CSF | Hydrocephalus |
| Unilocular | ||||
| Communicates with ventricles | ||||
| 1b | M > F | Neonate, macrocephaly | Isointense to CSF | Thalamic fusion without subcortical heterotopia |
| Unilocular | ||||
| Communicates with third ventricle | ||||
| 1c | M | Neonate, seizures, | Isointense to CSF | Small ipsilateral cerebral hemisphere |
| microcephaly | Unilocular | |||
| Communicates with lateral and third ventricle | ||||
| Type 2: No communication with ventricle | ||||
| 2a | M | Neonate, macrocephaly | Isointense to CSF | Hydrocephalus |
| Multilocular | ||||
| No communication with ventricle | ||||
| 2b | F | Infant, delay, seizures, | Multiloculated | Subependymal heterotopia |
| micro/macrocephaly | No communication with ventricles | Polymicrogyria | ||
| Hyperdense on CT, hyperintense on T1 MRI | Deficient falx cerebri | |||
| 2c | M | Child, seizures, delay | Isointense to CSF | Subcortical heterotopia |
| Multilocular | ||||
| No communication with ventricle | ||||
| 2d | ? | Macrocephaly | Arachnoid cyst | None |
| Isointense to CSF | ||||
| Unilocular | ||||
| No communication with ventricle |