Contrast enhancement (CE), contrast extravasation (CX), hemorrhagic transformation (HT), and cerebral hyperperfusion syndrome (CHS) in patients who have suffered ischemic stroke and have undergone revascularization. There are a handful of articles addressing these pathologies separately. But there is scant literature available combining them together, as the underlying pathophysiology involves disturbances of blood–brain barrier (BBB). We have reviewed literature and proposed a common mechanism for these events. We systematically searched PubMed, LibGen, Cochrane, and Sci-Hub databases for the studies published online regarding CE, CX, HT, and CHS after endovascular treatment for stroke. This review was conducted based on the PRISMA guidelines. The following medical search terms were used for the online search: contrast enhancement, contrast extravasation, hemorrhagic transformation, cerebral hyperperfusion syndrome, endovascular treatment, contrast staining, postprocedural attenuation, carotid stenting, intra-arterial thrombolysis, and stroke. We did a limited review of literature by analyzing the relevant articles and research papers published to date. We have randomly included prototype cases of CE, CX, HT, and CHS which we have encountered in our Interventional Department from our own database. In compliance with PRISMA guidelines, we screened 33 articles dealing with CE, 32 with CX, 26 articles that addressed CE and CX both, 53 articles dealing with HT, and 42 articles dealing with CHS. Overall, 88 articles were filtered on studying the abstract. Further, 15 more had to be excluded as reasoned in the flowchart, and finally 71 articles were included in our study, as again shown in the flowchart. We studied and discussed these articles and research papers in relation to pathophysiology, predisposing factors, preventive measures, and current treatment protocols. BBB disruption is the primary event in CE, CX, HT, and CHS with varying severity. Minimizing dose of contrast, optimum timing of revascularization and dose of thrombolytic, judicious selection of mechanical thrombectomy cases, and strict control of blood pressure in postrevascularization period are recommended preventive measures. High-index of clinical suspicion, early imaging to detect, and following-up the same on sequential imaging are key to avoid severe forms of HT and CHS.

Background: Cervical rib, though it is seen incidentally in the radiographic examination of chest and cervical spine, a particular subset of it can present with thoracic outlet syndrome. This article mainly focuses on the symptom causation of articulating cervical rib, as compared to non-articulating cervical rib which is often asymptomatic. There are many articles describing a cervical rib, but those highlighting this particular relation between the types of cervical rib and symptom causation are not present in present database. The review of serial radiographs upon correlating clinically, lead us to conclude that articulating variant of cervical rib is majorly symptomatic and caused grave arterial complications. The article consists brief discussions on the types of cervical ribs, thoracic outlet syndrome and role of imaging in diagnosing a cervical rib. Main Body: We have illustrated five such cases from our tertiary care hospital and highlighted the relationship between the magnitude of symptoms and variations of cervical rib. In compliance with PRISMA guidelines, we screened 33 articles dealing with cervical rib and 13 with thoracic outlet syndrome. Overall, 46 articles were filtered on studying the abstract. Further, 15 more had to be excluded as they were case reports and case series, and finally 31 articles were included in our study. We studied and discussed these articles and research papers in relation to variant anatomy of cervical rib, its types and symptom causation. In our study, also routine sequential chest radiographs were reviewed during the period of January 2020 to January 2021 and those with cervical rib and/or elongated C7 transverse process were included. Conclusion: Thus, to conclude we can state that articulating cervical ribs pose a greater threat and cause arterial occlusion. Key words: Cervical rib, thoracic outlet syndrome, subclavian artery.