Pontine Glioma

Fig. 11.26a Massive signal increase and expansion of the pons are very well appreciated on the T2-weighted images. b After contrast administration, there is no perceptible enhancement, as is frequently the case in pon-tine glioma.
Pontine Glioma Growth

Arachnoid cyst: Arachnoid cysts are located extra-axially and as a rule are asymptomatic. They may expand, however, causing headaches in due course. They are preferentially located at the skull base, often in the temporal fossa. In MRI and CT their signal/density follows that of cerebrospinal fluid, with which they are filled (Fig. 11.27).

Colloid cyst: This entity is a cystic tumor whose content is rich in protein. It originates in the immediate vicinity of the foramen of Monroe (Fig. 11.28). If the tumor blocks the foramen, an obstruction of the physiological CSF circulation results in acute hydrocephalus. This crisis is characterized by a sudden intense headache associated with nausea and emesis. Occasionally syncope ensues. The clinical appearance can be quite characteristic: a young adult suddenly becomes unconscious, falls to the ground, shakes the head and gets up again, becomes unconscious, falls to the ground, shakes the head and gets up again, becomes unconscious

I Arachnoid Cyst

Foramen Monroe Obstruction
Fig.11.27 The CTsection shows a mass of CSF density that has expanded the temporal fossa. This patient suffered from epileptic seizures. Most arachnoid cysts are much smaller and basically represent normal variants.
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