An unusual association of extraoral sinus tract with unerupted permanent tooth.

Cases have been reported in the literature in which extraoral sinus tracts of dental origin have been diagnosed and successfully treated. Similarly, the presence of an intracoronal radiolucency in unerupted permanent teeth has been found in the dental literature. The association of one with the other, however, is a rare occurrence. The purpose of this case report was to describe the treatment of a 7-year-old child who presented with an extraoral draining sinus originating from a carious, developing tooth bud of the unerupted permanent mandibular left second molar. After a thorough clinical and radiographic examination, a conclusive diagnosis was determined and surgical treatment was performed. The patient responded well, and the cutaneous lesion healed uneventfully.