This is a report of a 13 1/2 year old girl with bilateral benign cystic ova
rian teratomas (BCOT). The clinical presentation was with an abdominal mass
and an abdominal X-ray film confirmed the mass which contained teeth. Prev
ious abdominal X-ray at 3 and 10 years of age had not shown any abnormality
. The clinical features and the radiological findings indicated that the BC
OT had enlarged and matured during the period of follow-up.