You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Polka dot appearance on CT scan is seen in which of the following? and explain in detail?
Ans. is 'c' i.e., Vertebral hemangioma Characteristic radiological features of few bone tumorso Celery-stick appearanceEnchondromaso Coat-hanger appearanceOsteochondromao Codman tumor and chicken-wire calcificationChondroblastomao Double density sign on radionuclide scanOsteoid osteomao Nidus and sclerotic rimOstoid osteomao "Driven snow" appearancePindborg tumoro Fallen fragment/'Hinged fragment signSimple (unicameral) bone cysto "Eggshell" covering of expansile cortex over surface of lesionABCo ' Soap bubble' appearanceABCo Soap bubble appearance (& goes into comers)GCT (Osteoclastoma)o 'Floating tooth' signEosinophilic granuloma, adamantinomao Onion skin (onion peel) appearanceEwing sarcomao Skip lesionsOsteosarcoma, Ewings sarcomao 'Sunrav/Sunburst' appearanceOsteosarcomao String sign (to differentiate from myositis ossificans)Parosteal osteosarcomao Popcom/mottled calcificationChondrosarcomao Shepherd's crook deformityFibrous dysplasiao Codman's triangleOsteosarcoma, Ewing sarcomao Winking owl signMetastasis to pedicles of vertebrao Corduroy/accordian vertebra'vertical striationsVertebra] hemangiomao Polka dot sign on CTVertebral hemangiomao Geographical skullEosinophilic granulomao Hole-within-a-hole lesionEosinophilic granuloma