Any PCB can be manufactured with rounded edges, rounded corners, etc.. With modern fabrication methods, it is conceivable that the entire PCB could be made into a round ball.
The mission of PCB is to support the components mounted on it, and to supply the electrical connections between them. As long as it carries out these two functions the actual, shape doesn’t matter.
Lee mas: ¿Qué es una placa PCB?
#Diseño de PCB