“…As suggested by other authors, 4 ml of Patent Blue Violet (PBV; Bleu Patente' V 2.5% sodique, Guerbet, Roissy, France) were injected directly into the substance of the cervix at 3, 6, 9, and 12 O'clock (depth of injection 0.5-1 cm) by using a 22-gauge spinal needle after the induction of general anesthesia [14,15,17,19].…”