報告日期： 2017/08/08 內文：
Abstract
1. Osteoid osteoma is a benign skeletal neoplasm most frequently observed in young individuals.
2. The tumor most commonly occurs in the femur, the tibia, and the phalanges
Introduction
1. Osteoid osteoma is a unique benign tumor of the bones
2. a “small, oval or roundish tumor like nidus which is composed of osteoid and trabeculae of newly formed bone deposited within a substratum of highly vascularized osteogenic connective tissue.
3. It usually occurs in young adults under 30 years of age
4. Pain is a distinguishing feature of this lesion and is accompanied by vasomotor disturbances.
Case presentation
1. pain and swelling in the lower left posterior region of the jaw.
2. a diffuse, bony hard swelling extending superoinferiorly from the left lower border of the mandible to 2 cm below it.
3. One left submandibular lymph node was palpable, slightly mobile, and tender.
4. Buccolingually, the swelling was 3 cm in diameter. Mesiodistally, it extended from the mandibular left first premolar region to the first molar region 5. From this clinical picture, a differential diagnosis of infected residual cyst,
osteomyelitis, and benign bone neoplasm were taken into consideration.
1. There is a well-defined radiopacity with a radiolucent rim showing a central radiopaque nidus surrounded by a radiolucent border.
2. The radiopaque mass consisted of a radiopaque nidus measuring 1.5 cm in diameter surrounded by the formation of subperiosteal new bone. The whole mass measured 3.5 cm (maximum) in diameter.
1. Based on the results of the radiographic analysis, osteoid osteoma,
cementoblastoma, complex odontoma, ossifying fibroma, osteoblastoma,
and idiopathic osteosclerosis were considered in the differential diagnosis.1. irregular bony trabeculae lined with plump osteoblasts.
2. The bony trabeculae showed varying degrees of calcification and reversal lines.
3. The trabeculae comprised of lacunae with osteocytes within them.
4. The stroma was fibrocellular and consisted of many dilated vascular channels and areas of hemorrhage
Discussion
differential diagnosis
ossifying fibroma asymptomatic, can cause bone expansion, root resorption or displacement of teeth
idiopathic osteosclerosis usually asymptomatic and do not cause bone expansion cementoblastoma asymptomatic and characterized by the proliferation of
cementum in close association with the tooth root complex odontoma usually asymptomatic and do not cause bone expansion osteoblastoma Not presence of radiopaque nidussurrounded by
sclerotic new bone formation
osteoid osteoma
symptomatic and do not cause resorption or
displacement of teeth, not associated with the roots of any tooth ,presence of radiopaque nidus surrounded by sclerotic new bone formation.
Clinical, radiographic, and pathological features were considered to arrive at the correct diagnosis.
The small number of cases reported in this regard necessitates an increased awareness among the dentists worldwide to report additional cases in literature.
It will provide a medium for better understanding and show a clear picture of such rare bony lesions so that they could be diagnosed at a much earlier stage.
題號 題目
2 Which is common findings in X-ray of osteoid osteoma?
(A) Ill-defined border (B) Root resorption
(C) Proliferation of cementum (D) “nidus”
答案 (D )
出處：Oral and Maxillofacial Pathology, 4ed , P609
