Collision tumor means the coexistence of two adjacent, but histologically distinct tumors without histologic admixture in the same tissue and is rare incidence involving ovary. Because of their incidence of occurrence, benign cystic teratomas often occur coincidentally with other abnormalities of the ovary. Most common histologic combination of collision tumor in the ovary is coexistence of teratoma with mucinous tumors. But its association with serous tumor has been noted rare and incidence is unknown. We have experienced a case laparoscopic treatment of a huge serous cystadenoma combined with ovarian benign cystic teratoma in right ovary, and report it with a brief review of literature.

Placental abruption is defined as the early separation a normal placenta from the wall of the uterus before delivery of the fetus. The incidence of it is known 1% of all pregnancies and perinatal mortality rates from abruption range from 20% to 40% in recent studies. The most common symptom is vaginal bleeding. The causes are associated with preeclampsia, other hypertensive disorders, and premature rupture of membranes. It is diagnosed by clinical symptom, sign, and ultrasonography. Recently we have experienced a case of placental abruption diagnosed at 31 weeks by ultrasonography in bicornuate uterus with a brief review of the literature.