A case of a ruptured aneurysm is presented in which the angiograms did not disclose the sac. Rupture of an aneurysm of the anterior communicating artery was suspected from the distribution of subarachnoid blood on computerized tomography (CT), and the presence of a sac was highly suggestive on magnetic resonance imaging (MRI), which led us to open surgery. A non-thrombosed aneurysm was discovered at the suspected site, and successfully clipped. The necessity is discussed of MRI investigation in patients with subarachnoid haemorrhage (SAH) of unknown aetiology.
Figure 11. Hydrocarbon pore volume (HPV) map showing the lateral variations of this important petrophysical parameter in the mapped area of the BED-1 Field. The highest HPV values exist around BED1-10A and BED1-11 wells and the lowest values around BED1-1, BED1-5, and BED1-8 wells.
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