Background: Osteoid osteoma is a benign tumor that occurs in the spine in 10-20% of cases. Tumor presents with pain and/or deformity and usually causes torticoli in the cervical spine, and C-shape painful scoliosis is the most common presentation in the thoracic and lumbar spine.Methods: We studied 19 patients with established Osteoid osteoma of the spine and reviewed their symptoms, site of involvement, imaging and treatment options. We also followed patients to determine the recurrence of tumor and outcome of deformity after tumor excision.Findings: Painful torticoli was the most common presentation of Osteoid osteoma in the cervical spine (75%). In thoracic and lumbar lesions, painful scoliosis was the most common presentation (80%) but the tumor can be a painful condition in spine or even only a deformity. Typical night pain was seen in 9 patients. Tumor excision was the curative treatment although 3 patients needed posterior fusion because of scoliosis curve progression after tumor excision.Conclusion: Pain is the most common presentation of Osteoid osteoma in spine and is often accompanied by deformity. Whole. body isotope bone scan and CT scan can help in making the diagnosis. In patientswithcurveCobbanglemorethan40 degreesatI the time of tumor excision, posterior spinal fusion is required.

In the pictorial review of Osteoid osteoma we will compare imaging modalities including plain x ray, CT scan, isotopic scan in nearly all patients and MRI in selected cases with each other. We will discuss radiological features such as periosteal reaction and different locations of niduses. The most common location was tibia and the least common locations were fingers and the transverse process of the vertebra. Clinical signs and symptoms of Osteoid osteoma in approximately all patients were similar, such as night pain which was relieved by aspirin. This pictorial review aims to describe the imaging features of Osteoid osteoma in a series of 45 patients with various age ranges, tumor locations and different imaging presentations which were proved by pathology. In our series, we had two patients with recurrency.

Background: Regarding the prevalence of Osteoid osteoma and its known complications and also with respect to the controversies in diagnosis, clinical manifestations, and treatment of this disease, the present study was conducted on patients referring to Taleghani hospital since 1986 till 1997.Materials and methods: It was a case series study, where the diagnosis was made according to the clinical manifestations, especially nocturnal pain, and other paraclinical facilities. Patients were treated by EN-BIoc-excision or shaving, and at least one month later pain and other paraclinical parameters were surveyed among them.Results: 15 individuals with mean age of 15.6±3.7years and M/F=3.5 had entered this study. Lower to upper exttemity ratio was 13 to 2. Fourteen patients had undergone operation, where no recurrence has been reported, and pain was relieved in a patient spontaneously 6 years after the onset.Conclusion: Diagnosis and exact locating of the nidus and excision are the most important factors in Osteoid osteoma management. Other experimental studies are recommended.

Osteoid osteoma is a benign, bone-forming tumor that rarely involves the carpal bones. We report a case of Osteoid osteoma of the trapezoid carpal bone with extension to the adjacent second metacarpal bone. Chronic wrist pain and local tenderness were the major clinical signs and symptoms. In chronic wrist pain Osteoid osteoma and the possibility of extension to the adjacent bones should be considered.

Osteoid osteoma is a benign bone tumor of undetermined etiology, composed of a central zone named nidus which is an atypical bone completely enclosed within a wellvascularized stroma and a peripheral sclerotic reaction zone. There are three types of radiographic features: cortical, medullary and subperiosteal. Forty-four patients with Osteoid osteoma were studied retrospectively. In plain films, 35 patients presented as the cortical type, six cases were located in the medullary zone and three had subperiosteal Osteoid osteoma. In all the cases, the nidus was visualized on computed tomography (CT) scan. The nidus was visible in four out of five patients who had also undergone magnetic resonance imaging (MRI). Double-density sign, seen on radionuclide bone scans was positive in all patients. MRI is more sensitive in the diagnosis of bone marrow and soft tissue abnormalities adjacent to the lesion, and in the nidus that is located closer to the medullary zone. On the other hand, CT is more specific when it comes to detecting the lesion’s nidus.

Background: Osteoid osteomas (OO) are the third most common benign bone tumors affecting mostly children and adolescents with more tendency toward males. There are different treatment options consisting of medical therapy. Of note percutaneous thermal ablation (PTA) procedures that refer to radio frequency ablation (RFA) and interstitial laser photocoagulation (ILP) have also been recently applied with high success rates. Objectives: We aimed to assess the safety and outcomes of RFL and ILP in patients with OO as well as compare the efficacy of these two procedures. Patients and Methods: Medical records of 60 OO patients were retrospectively reviewed. Patients were divided into two groups, of which 40 underwent RFA procedures and 20 went through ILP. All patients were followed up clinically either through telephone interview or outpatient clinic visit and imaging was conducted in case signs and symptoms recurred. Results: In patients who underwent RFA, pain was relieved within 1-7 days in 35, and 1-3 months in five patients. Primary and secondary clinical effectiveness were 90. 00% and 92. 50%, respectively. In ILP, the technical success rate was 100% and the initial clinical success rate was 85. 00%. Conclusion: Similar to previous published studies, this study showed high success rates for both RFA and ILA. Total pain relief occurred in 96. 6% of the patients.

Osteoid osteoma is a benign bone tumor that is composed of Osteoid and atypical woven bone. This tumor included 11 - 12% of all benign skeletal lesions. Overall occurrence of phalangeal Osteoid osteoma is rare but in hand is extremely rare. In previous reports involvement of the phalangeal bone of the finger describe only in few cases. In this study, we report a case of a 25 years old man with a 2 months history of pain, enlargement, swelling in proximal phalanx of right fourth finger.

Background: Osteoid osteoma is a well-known benign tumor of bone. It occurs in children and young adults and is rarely seen above the age of 40. It is uncommon in hand and wrist. If it occurs in hand and wrist, its diagnosis is difficult because of its unusual presentations both clinically and radiologically. Materials and Methods: We encountered ten patients with Osteoid osteoma of hand during the last ten years in orthopedic department of Emam university hospital from 1970 to 1979. Results: The average age of ten patients with Osteoid osteoma of the hand and wrist that were treated in Imam hospital from 1369 to 1378, was 22.9 years (range, 14 to 33 years). Five lesions were in proximal phalanx, one in middle phalan x, and one in distal phalanx. In the wrist, one lesion was in the capitate, one in the lunate, and one in the hamate. The average time from onset of symptoms to successful treatment was 20 months (range, 4 months to 60 months). Three of ten patients had had treatment elsewhere, all of them had had unsuccessful operative procedures related to incorrect diagnosis. All patients had a minimum follow-up of 6 months (range, 6 months to 9 years, mean: 4.6 years). The operative treatment were successful in all ten patients without any signs or symptoms of recurrence. Only limitation of proximal interphalangeal joint range of motion was remained in one patient due to 60 months delay in diagnosis and treatment. Conclusion: High index of suspicion is necessary for diagnosis of Osteoid osteoma of hand because of unusual presentation of it. The most important factors for successful treatment of Osteoid osteoma of hand are accurate diagnosis and exact preoperative planning.