Reference article, Radiopaedia.org (Accessed on 01 May 2023) https://doi.org/10.53347/rID-15554. In certain situations, however, a contrast medium is essential. 2001 Mar;39(2):277-303. doi: 10.1016/s0033-8389(05)70278-5. endobj During the injection you may feel flushed and get a metallic taste in your mouth. PDF CT Exams Contrast vs Non-Contrast Guide - Oregon Imaging Musculoskeletal Infection: Role of CT in the Emergency Department When does chest CT require contrast enhancement? A ct urogram uses IV contrast (dye) to better evaluate the renal pelvis and ureter (the "tube" connecting your kidneys t. Read More. Normally the subcutaneous tissue is hypoechoic with few hyperechoic strands (representing connective tissue). Cellulitis. The specific agent and route of administration are based on clinical indications and patient factors. 2021;50(12):2319-47. Computed tomography (CT) with and without contrast: indications and protocols. 3. MeSH When the neoplasm has CT attenuation similar to that of adjacent structures (lymph nodes in the hilum, masses in the mediasti-num or chest wall), IV contrast can improve identification of the lesion and delineation of its margins and the relationship with adjacent structures (eg, vascular structures) (Figure 1). Saad A, Kho J, Almeer G, Azzopardi C, Botchu R. Br J Radiol. The PPV was 91.3% when more than one deep neck space was involved but only 50.0% in patients with isolated retropharyngeal abscesses. Unenhanced CT is also used in patients with spine and extremity trauma. ADVERTISEMENT: Supporters see fewer/no ads. endobj <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/MediaBox[0 0 612 792]/Contents 30 0 R/Group<>/Tabs/S/StructParents 0>> Necrotizing fasciitis of the lower extremity: imaging pearls and Most healthcare facilities have protocols dictating the cutoff at which IV dye may be administered in patients with impaired renal function. Correlation of histopathologic findings with clinical outcome in necrotizing fasciitis. Recent studies suggest that a combination of hydration, sodium bicarbonate, N-acetylcysteine, and decreased contrast volume may reduce this risk in high-risk populations.14,15, The question of whether this risk has been overstated has been raised in the medical literature. Department of Radiology Department of Radiology Outpatients requiring oral contrast for a CT scan require a prescription for Readi-Cat 2, 2 bottles of 450ml, take as directed. Turecki M, Taljanovic M, Stubbs A et al. Clear communication between the physician and radiologist is essential for obtaining the most appropriate study at the lowest cost and risk to the patient. CT is used to accurately differentiate between superficial cellulitis and deep cellulitis. What is the rationale for the laboratory workup for suspected pheochromocytomas and paragangliomas? Soft-tissue infections and their imaging mimics: from cellulitis to necrotizing fasciitis, Necrotizing soft-tissue infection: diagnosis and management, Red flags for necrotizing fasciitis: a case control study, Sonographic detection of necrotizing fasciitis, Necrotizing soft tissue infections: a primary care review. 4 0 obj sharing sensitive information, make sure youre on a federal Related editorial: Potential Harms of Computed Tomography: The Role of Informed Consent.