Opposite conclusion by Balasubramanya S, et al. World J Pediatr Congenit Heart Surg 2017;8:445-452. (Backer CL is author in both papers).
n=66. Northwestern, Chicago.
Length of intramural course were 8.6 mm +/- 2.5 vs. 8.9 mm +/- 2.8 (symptomatic vs. asymptomatic)!