Tight Sylvian Cisterns Associated With Hyperdense Areas Mimicking Subarachnoid Hemorrhage on Computed Tomography. Four Case Reports.

Familial perimesencephalic subarachnoid hemorrhage: two case reports

INTRODUCTION Non-aneurysmal spontaneous subarachnoid hemorrhage is characterized by an accumulation of a limited amount of subarachnoid hemorrhage, predominantly around the midbrain, and a lack of blood in the brain parenchyma or ventricular system. It represents 5% of all spontaneous subarachnoid hemorrhage cases. In spite of extensive investigation, understanding of the mechanisms leading to ...

Enlargement of the Veins in a Sylvian Fissure Mimicking a Subarachnoid Hemorrhage

Pseudosubarachnoid haemorrhage in subdural haematoma.

Two patients with large bilateral subdural haematomas with patterns of non-enhanced brain computed tomography (CT) falsely suggesting coexistent subarachnoid haemorrhage are presented. The CT images showed marked effacement of the basal cisterns with hyperdense signal along the tentorium, sylvian fissure, and the perimesencephalic cisterns. In both cases, the suspicion of subarachnoid haemorrha...

Hyperdense Cerebral Sinus Vein Thrombosis on Computed Tomography

so that specific treatment can be started. The cord sign (hyperdense thrombosed veins on unenhanced CT) and the empty-delta sign (a filling defect in the superior sagittal sinus on enhanced CT) are considered pathognomonic for SVT. REFERENCES 1. Haage P, Krings T, Schmitz-Rode T. Non traumatic vascular emergencies: imaging and intervention in acute venous occlusion. A two-year-old girl presente...

Subarachnoid hemorrhage mimicking acute myocardial infarction: case presentation

We present a patient with a subarachnoid hemorrhage (SAH) on the computed tomography and electrocardiogram changes compatible with myocardial infarction. SAH is a medical emergency, but it can be initially misdiagnosed. Diagnosis may be delayed due to atypical presentations of SAH and this may endanger the life of the patient. Electrocardiogram abnormalities have been described previously in SA...