Primary amenorrhea secondary to childhood pelvic trauma is very rare. We report two cases of adolescent girls with cryptomenorrhoea. Case 1 presented at 14 years of age with primary amenorrhea and cyclical lower abdominal pain for 1 year. She was run over by a tractor when she was three years old. Ultrasonography pelvis showed hematometra. Examination under anesthesia with diagnostic laparoscopy proceed laparotomy revealed uterine avulsion at level of isthmus. The second case presented at 13 years of age with urinary retention. Catheterization was not possible due to malpositioning of urethra so suprapubic catheterization was performed by urologists. Ultrasonography pelvis revealed hematocolpos. Detailed history revealed run over injury by a vehicle when she was two years old. Examination under anesthesia showed obstruction due to adhesions high up in vagina which were divided.