Dear Editor, 

The research published by Tran Phan and Dang¹on the anatomical features of the posterior ethmoid artery (PEA) and the distance from PEA to the skull base and anterior ethmoid artery in Vietnamese is interesting. Tran Phan and Dang¹fortunately presented a few important study limitations. We now present another worthy one. Certain brain vessel variants and sino-nasal anatomic variations were found to be significantly more prevalent in some demographic groups and considerably vary compared to another when geographical and ethnic variations present enhancing the need for ethnicity-specific data^{2, 3}. Vietnam is an Asian country featured by its prominent ethnic diversity, and different ethnic classes contribute to the rich tapestry of the Vietnam community. The major ethnic groups recruit Kinh, Thái, Tay, Mường, Khmer, Hmong, Nùng, Hoa, Dao, and other minorities⁴. Tran Phan and Dang¹regrettably did not consider the ethnic disparities in their studied Vietnamese population. Hence, this limitation might further corrode the applicability of the study findings in endoscopic transnasal and skull base surgeries.