OOOO Volume 120, Number 2 thin radiolucent halos. Histopathological analysis conﬁrmed the diagnosis of compound odontoma. There was bone remodeling after 5 months. In routine or urgent care, the symptoms of compound odontoma can be the motivation for seeking treatment, but the diagnosis depends on complementary laboratory tests.
PCC-206 - KERATOCYSTIC ODONTOGENIC TUMOR MIMICKING A LATERAL PERIODONTAL CYST. THAYS TEIXEIRA DE SOUZA, JARDEL GALVÃO, MARIA ELIZA BARBOSA RAMOS, FÁBIO RAMOA PIRES, ROSEMIRO DE MENEZES MACIEL, MÔNICA SIMÕES ISRAEL, SARAH APARECIDA ANTERO. UNIVERSIDADE DO ESTADO DO RIO DE JANEIRO. Keratocystic odontogenic tumor (KOT) is an intraosseous lesion of the jaws, typically occurring in the posterior mandible but occasionally seen adjacent or lateral to the roots of vital teeth. A 42-year-old male sought treatment at our oral medicine clinic, presenting with a well-circumscribed swelling between teeth #41 and #42. Conventional radiographs showed a well-deﬁned, unilocular radiolucent image lateral to the roots of teeth #41 and #42, and the provisional diagnosis was lateral periodontal cyst or KOT. After the examination of an excisional biopsy sample, the ﬁnal diagnosis was KOT. At 6 months of clinical follow-up, there were no signs of recurrence. The differential diagnosis of KOT is based on radiographic images suggesting odontogenic cysts of inﬂammatory or development origin. When located lateral to the roots of vital teeth, KOT can mimic an LPC.
PCC-207 - MAXILLARY ADENOMATOID ODONTOGENIC TUMOR: A CASE REPORT. LETÍCIA CAPPELLANO, IRINEU GREGNANIN PEDRON, MARIA EUGÊNIA CEZERE DA SILVA, ELIANE DOS ANJOS QUEIROZ, ESTEVAM RUBENS UTUMI. Adenomatoid odontogenic tumor (AOT) is an asymptomatic lesion with slow but progressive growth that can be associated with impacted teeth. Its prevalence is highest in patients in the second decade of life. It is more common in the maxilla than in the mandible. Radiographically, AOT appears as a well-circumscribed, unilocular image, involving a non-erupted tooth. Histologically, AOT is composed of spindle-shaped, polygonal or cuboidal epithelial cells. A 15-year-old female presented with facial swelling in the nasolabial sulcus region, on the right side. Intraoral examination revealed a ﬁrm submucosal nodular growth, together with maxillary buccal and palatal cortical expansion, maintaining mucosal integrity. On the affected side, the right upper lateral incisor and right upper canine were absent. Panoramic radiography and computed tomography were performed. The patient underwent an excisional biopsy, and the surgical sample was submitted to histological examination. The histopathological diagnosis was AOT.
PCC-208 - MULTIPLE DENTIGEROUS CYSTS IN A NONSYNDROMIC PATIENT: A RARE CASE REPORT. MANUEL HENRIQUE DE MEDEIROS NETO, TONY SANTOS PEIXOTO, POLLIANNA MUNIZ ALVES, IROILDO JACINTO PEREIRA FILHO, MARIA CATARINA DA COSTA NETA, DALIANA QUEIROGA DE CASTRO GOMES. UNIVERSIDADE ESTADUAL DA PARAÍBA. Dentigerous cyst (DC) is the most common of all developmental odontogenic cysts. The treatment for DC is surgical excision by enucleation, or decompression followed by enucleation or by marsupialization. An otherwise healthy 49-year-old
ABSTRACTS Abstracts e65 male presented with an extensive radiolucent unilocular lesion with well-deﬁned margins involving 3 retained teeth in the mandible, which was discovered during a routine radiographic examination. We also found another lesion, smaller but with similar characteristics, involving a tooth in the maxilla. An incisional biopsy of the mandibular lesion conﬁrmed the diagnosis of DC. Both cysts were enucleated, the mandibular cyst under general anesthesia and the maxillary cyst under local anesthesia. The patient is under follow-up without signs of local recurrence. The presence of multiple DCs is rare in nonsyndromic patients.
PCC-209 - ORTHOKERATINIZED ODONTOGENIC CYST: CLINICAL, RADIOLOGICAL, HISTOPATHOLOGICAL, AND THERAPEUTIC APPROACH. LUIZ ARTHUR BARBOSA DA SILVA, ANTÔNIO DIONÍSIO DE ALBUQUERQUE NETO, LEORIK PEREIRA DA SILVA, JANAINA ANDRADE LIMA SALMOS DE BRITO, VANIO SANTOS COSTA, RICARDO VIANA BESSA NOGUEIRA, JOSÉ DE AMORIM LISBOA NETO. UNIVERSIDADE FEDERAL DE ALAGOAS. Orthokeratinized odontogenic cyst is a developmental cyst of odontogenic origin, which was initially deﬁned as an uncommon orthokeratinized variant of odontogenic keratocyst. It is not an aggressive lesion and has slow growth, occurring predominantly in the posterior mandibular region. Typically, it presents as a well-deﬁned, unilocular, radiolucent lesion associated with an impacted tooth. Histologically, it is characterized by an orthokeratinized stratiﬁed squamous epithelium with a prominent granular layer and a basal layer without palisade, hyperchromatism, or polarization of cells. A 35-year-old white patient presented with asymptomatic swelling on the left side of the face that had ﬁrst appeared 6 months earlier. Computed tomography revealed a well-deﬁned unilocular lesion located in the posterior mandible. An incisional biopsy was performed, and the diagnosis of orthokeratinized odontogenic cyst was established. Enucleation and curettage were performed, in conjunction with liquid nitrogen cryotherapy. The patient remains in clinical and radiographic follow-up.
PCC-210 - SOLID AMELOBLASTOMA ON THE MANDIBLE: A CASE REPORT. MARCELO ANDERSON BARBOSA NASCIMENTO, LAUDENICE DE LUCENA PEREIRA, PETRUS PEREIRA GOMES, MÁRCIO MENEZES NOVAES, ÉRICKA JANINE DANTAS DA SILVEIRA, LÉLIA BATISTA DE SOUZA. UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE. Solid ameloblastoma is a benign odontogenic epithelial tumor, which is one of the most common odontogenic tumors, having clinical and radiological subtypes, and various histopathological patterns. Despite being a benign tumor, it has a distinct biological behavior due to its inﬁltrative growth and high recurrence potential. A 58-year-old female patient presented with a growth on the anterior region of the mandible. She reported that the growth had ﬁrst appeared 6 years earlier. Computed tomography showed a radiolucent lesion with a multilocular aspect and rupture of cortical bone. After an incisional biopsy, the histopathological examination showed classical features of ameloblastoma and the patient was referred for oral rehabilitation. Given the inﬁltrative behavior and the high recurrence rates of this tumor, we emphasize the importance of adequate diagnosis for determination of the best treatment.