What is nidus in osteoid osteoma?
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.
What is double density sign?
The double-density sign, also known as the double right heart border, is seen on frontal chest radiographs in the presence of left atrial enlargement, and occurs when the right side of the left atrium extends behind the right cardiac shadow, indenting the adjacent lung and forming its own distinct silhouette 1-3.
How can you tell the difference between osteoid osteoma and osteoblastoma?
Histologically, osteoid osteoma and osteoblastoma are similar, containing osteoblasts that produce osteoid and woven bone. Osteoblastoma, however, is larger, tends to be more aggressive, and can undergo malignant transformation, whereas osteoid osteoma is small, benign, and self-limited.
How is osteoid osteoma diagnosis?
A biopsy may be necessary to confirm the diagnosis of osteoid osteoma. In a biopsy, a tissue sample of the tumor is taken and examined under a microscope. Your doctor may give you a local anesthetic to numb the area and take a sample using a needle. A biopsy can also be performed as a small operation.
Is osteoid osteoma the same as osteosarcoma?
Bone Lesions Clinically, the pain associated with osteoblastoma is also less often relieved by aspirin. Osteoid osteoma is distinguished from osteosarcoma by its radiologic pattern, strict histologic circumscription, and lack of significant cytologic atypia, abnormal mitotic figures, or malignant cartilage.
What is the difference between osteosarcoma and osteoma?
Osteosarcoma is larger than osteoid osteoma, exhibits a poorly defined margin radiographically, and microscopically demonstrates greater cytologic atypia and mitoses.
What is double density sign in fungal sinusitis?
Within the sinuses the presence of mild thickening to complete opacification may be present. In most cases, varying degrees of density (“double-densities”) are seen. The majority of maxillary sinuses exhibiting fungal disease will radiographically show near complete opacification.
What does atrial enlargement mean?
Too much pressure or too much blood volume can both cause the left atrium to become bigger, which causes left atrial enlargement (LAE). The increased pressure or volume is caused by an underlying cardiovascular condition—discovering that someone has LAE should initiate the search for the condition that is causing it.
Is osteoid osteoma rare?
Osteoid osteoma (OO), a rare bone-producing tumor, can occur anywhere in the skeleton, [1, 2] and in the spine it is frequently located in the posterior elements involving the lamina, pedicles, or the transverse and spinous processes [3, 4].
Can osteoid osteoma turn cancerous?
Osteoid osteoma is a benign bone-forming tumor that does not turn malignant.
How common is osteoid osteoma?
Osteoid osteoma accounts for around 5% of all bone tumors and 11% of benign bone tumors. Osteoid osteoma is the third most common biopsy analyzed benign bone tumor after osteochondroma and nonossifying fibroma. Two to 3% of excised primary bone tumors are osteoid osteomas.
What is the double density sign of osteoid osteoma?
Double density sign (osteoid osteoma) A.Prof Frank Gaillard ◉ ◈ et al. The double density sign, also sometimes clumsily referred to as the hotter spot within hot area sign, is a bone scan sign of an osteoid osteoma.
What is a double density sign in a bone scan?
The double density sign, also sometimes clumsily referred to as the hotter spot within hot area sign, is a bone scan sign of an osteoid osteoma.
What is the nidus of a bone?
It refers to a central focus of intense uptake (the nidus) within a surrounding lower, but nonetheless increased uptake, rim. 1. Bahk Y. Combined Scintigraphic and Radiographic Diagnosis of Bone and Joint Diseases.
What is the etiology of osteoid osteomas?
The etiology of osteoid osteomas remains uncertain. Some believe it is a benign neoplasm while others maintain it is due to trauma or an inflammatory process. Go to: Epidemiology Osteoid osteomas account for 10% of benign bone tumors.[2]