Co-existence of ranula and possible thyroglossal duct cyst in a newborn baby.

In this paper, we report a case of congenital ranula lying adjacent to a possible thyroglossal duct cyst. The patient was a newborn baby who presented no remarkable anomalies in other regions. He was referred to us by a gynecologist because of swelling of the oral floor and elevation of the tongue. There were no noteworthy findings in the patient's family or personal history, including during gestation. Our clinical diagnosis was a sublingual cyst. The cyst was surgically enucleated at 9 months old when his body weight reached 9 kg. The cyst consisted of two compartments, one superficial and the other deep, which were completely separate. From clinical and pathological findings, the superficial portion was diagnosed as a congenital ranula, and the deep cyst was supposed to be a thyroglossal duct cyst. A close etiological relationship was suggested between these two adjacent cysts.