Intraplacental Mature Cystic Teratoma

Area of Science:

• Obstetrics and Gynecology
• Pathology
• Reproductive Medicine

Background:

• Placental teratomas are benign germ cell tumors.
• They are composed of mature tissues from multiple germ layers.
• These tumors can mimic a cardiac fetus but lack organized fetal structures and an umbilical cord.

Purpose of the Study:

• To present a case of placental teratoma.
• To highlight diagnostic criteria and differentiation from other placental abnormalities.
• To emphasize the benign nature and lack of recurrence risk.

Main Methods:

• Case presentation of a singleton pregnancy with placental teratoma.
• Gross and histological examination of the placenta.
• Differential diagnosis discussion including acardiac twin and TRAP sequence.

Main Results:

• A 3.5 cm intraplacental lesion was identified.
• Histology confirmed mature tissues consistent with a mature cystic teratoma.
• The lesion lacked an umbilical cord and organized fetal structures.

Conclusions:

• Placental teratomas are distinct from acardiac twins and TRAP sequence.
• They occur in singleton pregnancies and have no recurrence risk.
• Accurate diagnosis is crucial to avoid misclassification and unnecessary interventions.