Ruptured aneurysm of an azygos anterior cerebral artery

Abstract

A ruptured saccular aneurysm of the azygos pericallosal artery was found and clipped successfully in a woman of 47 years. Aneurysm of an azygos pericallosal artery is extremely rare.

Ruptured Aneurysm Arising From the Proximal End of an Azygos Anterior Cerebral Artery-Case Report-

“…3,4,8,[10][11][12]14,15) Azygos ACA aneurysms rarely arise from the proximal artery. We report a case of a ruptured aneurysm arising from the proximal end of the azygos ACA associated with fenestration of the hypoplastic A 1 segment.…”

Fetal azygos pericallosal artery

“…Variations in the diameter of the A1 segment have been noted by a number of authors (Katz et al, 1978;Kondo et al, 1979;Jelicic, 1985;Milenkovic et al, 1987;Pavlovic and Vasovic, 1995;Marinkovic et al, 2001). The azygos pericallosal artery may be several centimetres long, either in infants (Szdzuy et al, 1972) or in adults (Katz et al, 1978;Milenkovic et al, 1997).…”

“…The fetal azygos pericallosal artery in the present study had five anteromedial central branches, while Jelicic (1985) presented one right Heubner's artery or medial striate artery as defined by Carpenter (1991) andTerminologia Anatomica (1998). Other branches were noted by Szdzuy et al (1972), Belenkaya (1974), and Kondo et al (1979) but there is insufficient documentation to discern a pattern. Other workers have described the termination of the azygos pericallosal artery.…”

“…Other workers have described the termination of the azygos pericallosal artery. Usually it ends in a bifurcation (Katz et al, 1978;Kondo et al, 1979;Woiciechowsky et al, 1995) with no particular pattern to the arrangement of the more distal vessels. Associated vascular variations and abnormalities in individual specimens were reported by Szdzuy et al (1972), Belenkaya (1974), and Katz et al (1978), but again there is no obvious pattern.…”

“…It can be easily identified when brains are examined grossly, but angiographic distinction between the azygos and the paired ACAs is difficult (Katz et al, 1978;Huber et al, 1980). An azygos artery may develop an aneurysm (Katz et al, 1978;Kondo et al, 1979;Huber et al, 1980;Milenkovic et al, 1997) or be associated with other more distal anterior cerebral artery aneurysms (Miyazawa et al, 2000). It is also described in association with agenesis of the corpus callosum, meningocoeles, and porencephalic cysts (Szdzuy et al, 1972;Pavlovic and Vasovic, 1995), and as a constant finding in the middle interhemispheric variant of holoprosencephaly (Simon et al, 2002).…”