11-Year-old female patient referred from Melipilla Hospital due to left mandibular mass since 2 months. Reports local pain, without paresthesia or other sensitivity disturbances. Presents extense and fluctuating mass comprising mandibular ramus and body up to tooth 31 (3.7). Radiographically presents an extense radiolucid area, homogeneous and corticalized up to tooth 31 (3.7) which displaces the third molar. The treatment decided is biopsy and installation of a collar for irrigation with chlorhexidine. Biopsy indicates a diagnosis of plexiform intraluminal unicystic ameloblastoma, by the Oral Pathology Reference Institute (IREPO) (3) in 2005. At 6 months clinical and histopathological control the patient presents decompression of the cyst and biopsy diagnosis of unicystic ameloblastoma. Treatment is continued. At 1 year clinical and histopathological control biopsy indicates absence of ameloblastic cells and presence of a cystic membrane. During the 7-year follow-up there are no signs of relapse and patient is well. In the literature we found 3 cases of ameloblastomas treated conservatively that have evolved with no signs of ameloblastoma.

Conflict of interest: No conflict of interest present.