Uncommon Association of Two Anatomical Variants of Cerebral Circulation: A Fetal-Type Posterior Cerebral Artery and Inferred Artery of Percheron, Complicated with Paramedian Thalamomesencephalic Stroke—Case Presentation and Literature Review

Table 1

Summary of microvascular anatomic investigations of the posterior vascularization and reported incidence of AOP associated or not with other variants in the circle of Willis.

Author, year	Number of brain specimens	Average number of TPAs/brain	Frequency of AOP (%)	P1 segment (hypoplastic or absent)
Grochowski, Maciejewski, 2017 [9]	13	5.8	0%	Not reported
Djulejić, 2015 [10]	12–16	2.2	0%	Not reported
Griessenauer, 2013 [11]	25	Not available	12%	0% (specified)
Kocaeli, 2013 [12]	34	8.5	11,7%	Not reported
Parraga, 2011	35	6	Not reported	Not reported
Park, 2010 [13]	26 (158)	7,2	11,5%	Not reported
Kaya, 2010 [14]	14	6.8	11,7	Not reported
Pai, 2007	25	4	Not reported	Not reported
Uz, 2007 [15]	15	4	7%	Not reported
Cosson, 2003	12	7.5	Not reported	Not reported
Rassi, 1992	30	3.2	Not reported	Not reported
Caruso, 1990	50	8.2	Not reported	Not reported
Marinkovic, 1986 [16]	33	4	Not reported	Not reported
Pedroza, 1986 [17]	28	1-5	10,7%	Not reported
Lang, Bruner, 1978	50	Not available	8%	Not reported
Zeal, Rhoton, 1978	25	5.4	Not reported	Not reported
Saeki, 1977	50	8.2	8%	hypoplastic P1

AOP, artery of Percheron. Data are modified and adapted after Grochowski (2017) [9], Griessenauer (2013) [11], Kocaeli (2013) [12], and Park (2010) [13] and are chronologically arranged.