Perimesencephalic subarachnoid hemorrhage with a positive angiographic finding: case report and review of the literature.
The vast majority of perimesencephalic subarachnoid hemorrhage cases are reported as negative-finding etiologies. Recently, high-resolution images allowed us to overcome the previous difficulty of finding the source of bleeding, which underlies the concept of a "negative finding". We discovered a venous etiology, hidden behind the tip of the basilar artery; namely, the lateral pontine vein. Here, we review the literature on perimesencephalic subarachnoid hemorrhage and on venous aneurysm. We highlight this type of aneurysm as a candidate source of perimesencephalic hemorrhage. This case may change our way of dealing with what we have termed a negative finding of subarachnoid hemorrhage.
Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Topeliuksenkatu 5, PB-266, 00029, Hus, Finland. ext-ahmad.hafez@hus.fi.
Ahmad
A
Hafez
Department of Radiology, University of Helsinki and Helsinki University Hospital, Topeliuksenkatu 5, PB-266, 00029, Hus, Finland.
Jussi
J
Numminen
Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Topeliuksenkatu 5, PB-266, 00029, Hus, Finland.
Raj
R
Rahul
Department of Radiology, University of Helsinki and Helsinki University Hospital, Topeliuksenkatu 5, PB-266, 00029, Hus, Finland.
Juha
J
Järveläinen
Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Topeliuksenkatu 5, PB-266, 00029, Hus, Finland.
Mika
M
Niemelä
D000368:Aged; D000783:Aneurysm / Q000150:complications / Q000000981:diagnostic imaging*; D002533:Cerebral Angiography; D002550:Cerebral Veins / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging* / Q000209:etiology
Perimesencephalic subarachnoid hemorrhage; Venous aneurysm