Obstructive Hydrocephalus

Byepsuadmin

These are the cranial CT scans from a patient with a recent left cerebellar infarct arrow_1. Due to the significant cytotoxic oedema as a result of the cerebellar infarct, the fourth ventricle is being compressed arrow_4, thus obstructing the normal CSF flow. The CT scan shows features of obstructive hydrocephalus and there is dilatation of the third ventricle arrow_5 (now appears ovoid compared to its usual “slit-like” appearance) as well as the temporal horn of the lateral ventricles arrow_6. The occipital horns of the lateral ventricles are also dilated arrow_7.

Similar Posts

  • Multiple Sclerosis

    Byepsuadmin

    The set of cranial MRIs shown here are from a young woman with a known history of relapsing-remitting multiple sclerosis. In the first scan (T2W axial cut), we can see multiple T2 hyperintense lesions involving bilateral cerebral cortices (Figure 1). These lesions are noted to be of a juxta-cortical and also peri-ventricular distribution, which are classical of multiple sclerosis. In the next…

  • Frontotemporal Dementia

    Byepsuadmin

    Frontotemporal dementia is the most common cause of dementia in patients under the age of 65. There are three different subtypes: 1) behavioural-variant frontotemporal dementia,the most common subtype which is characterised by changes in personality and social conduct; 2) progressive nonfluent aphasia – a disorder of language output that may occur in the absence of…

  • Thymoma

    Byepsuadmin

    In this contrast thoracic CT scan of a middle-aged woman with newly diagnosed seropositive generalized myasthenia gravis, an abnormal thymic lesion (present in the anterior mediastinal compartment) could be seen  (Figure 1). The patient was referred to the Cardiothoracic Surgeons where she received a thymectomy via an open sternotomy. The thymic specimen was sent for histo-pathological…

  • | |

    Basic principles of CT brain

    Byepsuadmin

    a) Principles of CT scan Computed Tomography (CT) is an imaging modality that uses computer-generated analysis ( i.e. computed ) of the x-ray attenuation through a section of the body tissue to produce cross-sectional images ( i.e. tomography ) with great anatomical details. Unlike plain X-ray images which are projected images of one plane, CT…

  • Osmotic Demyelination Syndrome

    Byepsuadmin

    This is a set of cranial MRIs from a patient with osmotic demyelination syndrome, formerly called central pontine myelinolysis. Osmotic demyelination syndrome occurs when wide fluxes in serum sodium levels are induced by too rapid correction of hyponatremia. Oligodendrocytes, which forms the myelin sheaths, are particularly vulnerable to osmotic changes. If the osmotic stress is…

  • Bickerstaff’s Encephalitis

    Byepsuadmin

    A middle-aged woman was admitted with drowsiness, weakness of all four limbs and visual impairment. Physical examination revealed that the patient had bilateral complete ophthalmoplegia, generalized weakness and spasticity,with brisk reflexes and bilateral upgoing plantar reflexes. A hyper-intense lesion at the level of the midbrain  was noted on cerebral MRI (Figure 1). Cerebro-spinal fluid examination…