| Popis: |
Two cases of non-communicating hydrocephalus caused by a relatively rare etiology were reported. The causes of hydrocephalus in these 2 cases were associated with congenital anomaly in the posterior fossa. Previously these lesions were very difficult to make diagnoses using CT scan due to the complicated structure in the narrow posterior fossa, and artefact by the bony structure. After the advent of nuclear magnetic resonance (NMR), NMR became an effective tool for the diagnosis of the posterior fossa lesion, as was presented in this paper. The first patient, a 4-month-old boy, had Dandy-Walker variant, manifesting enlargement of the torcular Herophilii, straight sinus, and vein of Galen, hypoplasia of the inferior vermis and corpus callosum, and a large cyst behind the vermis as well as hydrocephalus. The longitudinal length of the floor of the fourth ventricle was short, possibly associated with hypoplasia of the inferior vermis, but the shape of the fourth ventricle was essentially reserved. Communication of cerebro-spinal fluid between the cyst and subarachnoid space was demonstrated by CT cisternography. |
