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PE-206 - MANDIBULAR OSTEOSARCOMA: CASE

REPORT. JULYANNA FILGUEIRAS GONALVES DEFARIAS, DANIELA PITA DE MELO, POLLIANNA MUNIZALVES, CASSIANO FRANCISCO WEEGE NONAKA,GUSTAVO PINA GODOY, PATRCIA MEIRA BENTO,DALIANA QUEIROGA DE CASTRO GOMES. UNI-VERSIDADE ESTADUAL DA PARABA.

Osteosarcoma is an aggressive malignancy that originates

from primitive bone-forming mesenchymal cells and is charac-

terized by osteoid matrix production. Osteosarcomas are rela-

tively rare in the head and neck region. Approximately 5% of all

osteosarcomas occur in the jaws. Woman, 40, had a chief

complaint of strong pain and swelling in the mandible. Her

medical history revealed breast cancer. Intraoral examination

showed a lesion localized in the alveolar ridge between the third

molar and the second premolar on the right side of the mandible.

Panoramic radiograph and computed tomography revealed

alteration in the trabecular bone with no well-dened bound-

aries. Microscopically, intense cell proliferation and osteoid

matrix deposition were observed. The diagnosis was consistent

with osteosarcoma of metastatic breast cancer origin. Osteosar-

comas of the jaws are rare entities, but can evolve rapidly and

aggressively. Therefore knowledge of this lesion is vital to

correctly diagnose and treat patients.

PE-207 - MASTICATORY SPACE TUMOR: SCHWAN-

NOMA WITH PSEUDOCYSTIC CHANGES. ANDREZAVERUSKA LIRA CORREIA, LUCIANO PADILHA DOSSANTOS, JUREMA FREIRE LISBOA DE CASTRO, FLVIAMARIA DE MORAES RAMOS-PEREZ, FELIPE PAIVAFONSECA, OSLEI PAES DE ALMEIDA, DANYEL ELIAS DACRUZ PEREZ. FEDERAL UNIVERSITY OF PERNAM-BUCO; STATE UNIVERSITY OF CAMPINAS.

Schwannomas are benign neoplasms that arise from

Schwann cells. About 45% are located in the head and neckregion. The presence of pseudocystic areas is uncommon. A

case of schwannoma with pseudocystic areas was reported.

Woman, 57, was referred for diagnosis of a swelling located in

the oropharynx. Computed tomography revealed a well-dened

hypodense image within the medial and lateral pterygoid

muscles, measuring 4.0 cm in length. The lesion was excised

under local anesthesia. Microscopically, there were hyper-

cellular areas, with frequent nuclear palisading arrangements

(Antoni A pattern), interspersed by less dense reticular areas. A

large pseudocystic area was observed. Tumor cells were posi-

tive for S-100 protein, suggesting the diagnosis of schwan-

noma. In conclusion, schwannomas are well-circumscribed

lesions that may contain pseudocystic areas but carry a good

prognosis.

PE-208 - MELANOMA IN THE ORAL CAVITY: CLINICAL

CASE REPORT. VIVIANE DA SILVA SIQUEIRA, ANELISERIBEIRO PEIXOTO ALENCAR, ANDRESA BORGESSOARES, JOS FERREIRA DE MENEZES FILHO,FABRICIO PASSADOR SANTOS, RAFAEL STELINI. FAC-ULDADE DE ODONTOLOGIA SO LEOPOLDO MANDIC.

Melanoma is rare in the oral cavity, representing 0.2% to

8% of all melanomas. Man, 73, complained of a swelling,

present for the last 2 months, occurring after a dental extraction.

The lesion had been increasing in size. Oral examination

revealed an asymptomatic, exophytic, pigmented lesion,

measuring 5 5 cm, that was accompanied by an unpleasant

odor. An incisional biopsy was performed. Histopathological

examination revealed a fragment of mucosa lined by a stratied

squamous parakeratinized epithelium, showing numerous

irregularly distributed melanocytes, intense nuclear pleomor-

phism, and hyperchromatism. Melanocytic positivity was

demonstrated on immunohistochemical tests for HMB 45, S-

100, and Melan-A. The denitive diagnosis was melanoma. The

patient was referred to a head and neck surgeon for treatment.After investigation, metastatic lung disease was diagnosed. The

treatment of choice was palliative chemotherapy, but the patient

died 2 months after diagnosis.

PE-209 - MELANOTIC NEUROECTODERMAL TUMOR

OF INFANCY: CASE REPORT WITH 1-YEAR FOLLOW-

UP. JULIANA SEO, DANIEL ISAAC SENDYK, MARIACRISTINA ZINDEL DEBONI, DANIEL MARTINS DESOUZA, NORBERTO NOBUO SUGAYA, FABIO DAUMASNUNES. FACULDADE DE ODONTOLOGIA DA UNI-VERSIDADE DE SO PAULO.

Melanotic neuroectodermal tumor of infancy (MNTI) is a

rare, fast-growing tumor with a high recurrence rate. Com-monly it develops in the anterior maxilla of children younger

than age 1 year. Tumor origin is the neural crest. Girl, 2 months,

had an increasingly large area of swelling on the left cheek.

After tomography and biopsy, the diagnosis of MNTI was

established. Histological examination indicated a remarkable

combination of neural, melanocytic, and epithelial cell differ-

entiation. One year after tumor excision, the child has had no

recurrence. Since its rst description, about 260 cases of this

tumor have been reported. Early diagnosis minimized difculties

and risks during treatment and leads to an optimal outcome.

Despite complete surgical excision, careful follow-up is rec-

ommended. Maxillary functional orthopedic care and recon-

struction may be necessary.

PE-210 - MONOSTOTIC FIBROUS DYSPLASIA OF THE

JAW: CASE REPORT WITH 10-YEAR FOLLOW-UP.

SNTIQUE PRISCILA ALVES LUZ, JULIANA BASTOSFIGUEIRA, JSSICA OLIVEIRA MELO SILVA, LAIRARENATA LEMOS SANTOS, VIVIANE ALMEIDASARMENTO, PATRCIA LEITE RIBEIRO LAMBERTI. UNI-VERSIDADE FEDERAL DA BAHIA.

Fibrous dysplasia is an idiopathic benign bro-osseous

lesion in which the normal bone is replaced by brous tissue. The

monostotic form is found in 80% of diagnosed cases. Computed

tomography is the most common imaging method performed to

demonstrate the extent of the lesion in craniofacial bones. Sur-

gical treatment includes reducing the injury to an acceptablemargin, but future development is possible in 25% to 50% of

cases. Woman, 34, was diagnosed with monostotic brous

dysplasia of the jaw. She had been followed up for 10 years

through clinical and imaging surveillance at the School of

Dentistry, Federal University of Bahia.

PE-211 - MUCOEPIDERMOID CARCINOMA IN A

YOUNG PATIENT: CASE REPORT. ANA PAULA CANDIDODOS SANTOS, ANA PATRCIA CARNEIRO GONALVESBEZERRA COELHO, RENATA MENDES MOURA, FABIODAUMAS NUNES, DCIO DOS SANTOS PINTO JR.,ANDREA LUSVARGHI WITZEL, CELSO AUGUSTOLEMOS. FACULDADE DE ODONTOLOGIA DA USP.

ORAL AND MAXILLOFACIAL PATHOLOGY OOOO

e172 Abstracts February 2014