Fibro-osseous lesions are a diverse group of processes that are characterized by replacement of normal bone by fibrous tissue containing a newly formed mineralized product. The designation fibro-osseous lesion is not a specific diagnosis and describes only a process. Fibro-osseous lesions of the jaws include developmental (hamartomatous) lesions, reactive or dysplastic processes and neoplasms. The pathologic features may be very similar in lesions of diverse cause, behaviour and prognosis. Clinical, radiographic and histopathological correlation is usually most beneficial in establishing a specific diagnosis. These lesions can be classified as fibrous dysplasia, ossifying fibroma (of) and cement-osseous dysplasia. Hence based on above findings the present study was planned for Evaluation of Fibro-osseous Lesions of the Paranasal Sinuses. The present study was planned in Indira Gandhi Institute of Medical Sciences, Sheikhpura, Patna, Bihar, India. In the present study 15 patients diagnosed with the fibro osseous lesions were enrolled. The information regarding patient demographic characteristics, location of the lesion at presentation, CT scan findings, management approach, details of surgery performed, and outcomes were collected and presented as below. The Fibrous Dysplasia is significant for the otorhinolaryngology because it may affect facial and cranial bones and may cause deformities and dysfunctions. In spite of its benign nature, the signals and symptoms resulting from the compression of noble structures of the cranial base and orbit may generate diagnostic doubts as for the possibility of a malignant lesion. The surgical treatment must take into account the disease's harmful and recurrent potential, by choosing a more conservative approach and removing as much tissue as possible to prevent mutilations and functional deficits.