Exophthalmia associated with paranasal sinus osteoma in a Quarterhorse mare.
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An 11-year-old Quarterhorse mare developed a paranasal sinus osteoma that extended into the right orbit and led to ipsilateral exophthalmia. Although the tumor was radiographically evident in the paranasal sinuses, ultrasonography was used to demonstrate extension of the tumor into the retrobulbar space, and endoscopy was used to identify its extension into the nasopharynx. Biopsies were obtained using both fine-needle aspiration and paranasal sinus trephination. Despite numerous antemortem diagnostic tests, only postmortem histologic analysis of the mass afforded the diagnosis of osteoma. (+info)
Misdiagnosed iuxta-articular osteoid osteoma of the calcaneus following an injury.
(10/92)
The diagnosis of osteoid osteoma, in usual localizations, is generally simple. In iuxta-articular localizations this tumor may be unrecognized and the diagnosis delayed. Injury has been sometimes correlated with the onset of symptoms and this can make the diagnosis even more difficult. We present a case of osteoid osteoma of the calcaneus iuxta-articular to the subtalar joint in a 17-year-old basketball player. He had a history of initial injury, ankle sprain during training, followed by pain and swelling. He was initially treated for lateral ligament lesion of the ankle with unsatisfactory results. After acute trauma the pain changed becoming chronic and mostly nocturnal disappearing when rofecoxib was taken. Standard x-ray didn't show the lesion. Nuclear Magnetic Resonance (NMR) and scintigraphic results were not well interpreted but these clinical changes and Computed Tomography (CT) images supported the diagnosis of osteoid osteoma. The complete resection of the bone lesion resolved all the symptoms and the histological report confirmed the suspected diagnosis. (+info)
Osteoma of the condyle as the cause of limited-mouth opening: a case report.
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Osteoma is a benign tumour consisting of mature bone tissue. It is an uncommon lesion that occurs mainly in the bones of the craniofacial complex. Only a few cases involving the condylar process have been reported. An osteoma of the left condyle causing limited mouth-opening in a 32-year-old Malaysian Chinese female is reported here to alert the practitioner to consider this lesion as a diagnostic possibility in instances of trismus or limited-mouth opening. (+info)
Association of paranasal sinus osteoma and intracranial mucocele--two case reports.
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Two young adult males presented with paranasal sinus osteoma associated with mucocele. A 20-year-old man presented with headache and seizure, and another 20-year-old man presented with headache, frontal deformity, and visual disturbances. Both patients underwent surgery and satisfactory results were obtained. Isolated paranasal sinus osteomas are benign and slow-growing tumors, but may become more aggressive in association with mucoceles. The higher aggressiveness of the lesions may be due to the presence of the mucocele. Calcification and ossification of the mucocele probably contributes to the unexpected enlargement of the osteoma. (+info)
Nodular osteochondrogenic activity in soft tissue surrounding osteoma in neurogenic para osteo-arthropathy: morphological and immunohistochemical study.
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BACKGROUND: Neurogenic Para-Osteo-Arthropathy (NPOA) occurs as a consequence of central nervous system injuries or some systemic conditions. They are characterized by bone formation around the main joints. METHODS: In order to define some biological features of NPOAs, histological and immunohistological studies of the soft tissue surrounding osteoma and Ultrasound examination (US) of NPOA before the appearance of abnormal ossification on plain radiographs were performed. RESULTS: We have observed a great number of ossifying areas scattered in soft tissues. US examination have also shown scattered ossifying areas at the early stage of ossification. A high osteogenic activity was detected in these tissues and all the stages of the endochondral process were observed. Mesenchymal cells undergo chondrocytic differentiation to further terminal maturation with hypertrophy, which sustains mineralization followed by endochondral ossification process. CONCLUSION: We suggest that periosteoma soft tissue reflect early stage of osteoma formation and could be a model to study the mechanism of osteoma formation and we propose a mechanism of the NPOA formation in which sympathetic dystony and altered mechanical loading induce changes which could be responsible for the cascade of cellular events leading to cartilage and bone formation. (+info)
Choroidal neovascular membrane associated with choroidal osteoma (CO) treated with trans-pupillary thermo therapy.
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Choroidal neovascular membrane, a known complication of choroidal osteoma causing visual loss when located subfoveally, can be successfully treated with transpupillary thermo therapy. (+info)
Central giant cell granuloma and fibrous dysplasia occurring in the same jaw.
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Fibrous dysplasia (FD) is a developmental tumor like condition that is characterized by replacement of normal bone by an excessive proliferation of cellular fibrous connective tissue intermixed with irregular bony trabeculae. Central giant cell granuloma (CGCG) is described as a benign lesion affecting the mandible and maxilla that consists of a massive fibrohistiocytic proliferation with numerous heavily hemosiderin-laden multinucleate-giant cells. A 20 year old woman present at the Department of Oral Medicine, Dentistry School, Tehran University of Medical Sciences with a slowly growing non painful swelling of the right mandible for one year. Our differential diagnosis was osteoma, osteoid osteoma and Fd. The histological feature reveal Central giant cell granuloma fibrous dysplasia. Central giant cell granuloma and fibrous dysplasia occurring in the same jaw is rarely reported in the literatures. (+info)
Peripheral osteoma of the maxillofacial region. Diagnosis and management: a study of 14 cases.
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PURPOSE: The purpose of the article was to present 14 new cases of peripheral osteoma and to evaluate the diagnosis and management of peripheral osteoma of the maxillofacial region with an analysis of the literature. PATIENTS AND METHODS: The records of 14 consecutive patients (6 males and 8 females) referred for the management of peripheral osteoma the maxillofacial region were reviewed. Demographic data, location, presenting symptoms, radiographic findings, bone scan, colonoscopy results and surgical management were analyzed. The criteria used to diagnose peripheral osteoma included radiographic and histologic features. RESULTS: The 14 patients, ranged in age from 13 to 79 years with a mean age of 40.5 years. The lesions were located in the mandible (64%), maxilla (7%), temporal bone (22%) and maxillary sinus (7%). Colonoscopy results performed in 10 subjects were negative. Surgical excision was the treatment of choice with good results. There were no complications or recurrences. CONCLUSIONS: Peripheral osteoma of the jaw bones is uncommon. The post surgical follow-up should include periodic clinical and radiographic studies. Patients with osteoma associated with impacted or supernumerary teeth, should be evaluated for the possible Gardner's syndrome. (+info)