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Nodules in the thyroid gland are very common. As per the American Thyroid Association (ATA), thyroid nodules are dened as “discrete lesions within the thyroid gland, radiologically distinct from the surrounding thyroid parenchyma”. The incidence of thyroid cancer has been increasing worldwide in the last few decades (1). Papillary thyroid carcinoma attributes more than other histological subtypes of thyroid carcinoma (2,3). . The malignant nature of the nodule cannot be determined by physical examination and blood tests alone; hence specialized tests such as thyroid ultrasonography and ne needle biopsy are often required (4). To establish the accuracy of ACR-TIRADSObjective: classication system in the diagnosis of thyroid nodules in routine USG reporting and also to evaluate their Doppler characteristics. To conclude the study, the proper stratication of the thyroid nodules onResults & Conclusion: ultrasound-based TIRADS system helps us to determine the probability of a particular nodule being malignant with a certain level of condence and appropriate measures for management of the nodule can be initiated, thus avoiding unnecessary FNA procedures. The addition of Color Doppler further strengthens the probability of a nodule being malignant and thus prompt action can be initiated by the referring clinician/surgeon.

Computed tomography angiography is non-invasive and readily available technique for assessment of intracranial vascular lesions. It has broad acceptance by patients and is relatively inexpensive. However, there are some shortcomings with this modality, such as the decreased accuracy in small pathologies or calcied vessels and inability to assess dynamic cine view. DSA, on the other hand, provide excellent characterization and excellent anatomic delineation of small and large vascular pathologies. There is a signicant difference, in the inherent costs of DSA and CTA. In this article We have studied various intra cranial vascular pathologies on both CTA and DSA and compared their sensitivity and specicity for diagnosis. The comparative study was carried out with 80 patients. According to this study, computed tomography angiography remains the rst line of imaging for the intracranial pathology with high diagnostic accuracy rates with 92.4% sensitivity and 92.5% accuracy. In 5 patients where CTA were inconclusive, DSA was diagnostic investigation.

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