H. Sakamoto et al., CONGENITAL MIDLINE SINUS OF THE UPPER LIP - REPORT OF A CASE, International journal of oral and maxillofacial surgery, 21(1), 1992, pp. 10-11
The occurrence of a congenital midline sinus of the upper lip is rare,
only 22 cases having been previously reported. This case report descr
ibes the excision of a congenital midline sinus of the upper lip in a
2-year-old girl.