Wong CH, Khin LW, Heng KS, Tan KC, Low CO. Required fields are marked *. Become a Gold Supporter and see no third-party ads. Abscess | Radiology Reference Article | Radiopaedia.org Patients with history of anaphylactic reaction should not receive contrast. Contrast enhancement of the pulmonary arteries is key, as embolic disease is identified as abnormal filling defects within the pulmonary arteries (Figure 2). Check for errors and try again. Yu J & Habib P. MR Imaging of Urgent Inflammatory and Infectious Conditions Affecting the Soft Tissues of the Musculoskeletal System. Case 1: orbital and periorbital cellulitis, see full revision history and disclosures. In the emergency setting, CT of the neck is often performed to investigate symptoms of acute infection or inflammation or symptoms of aerodigestive tract compromise referable to the neck. Soft-tissue gas is seen at the lateral aspect of the left knee along the fascial planes on the radiograph. Sign In to Email Alerts with your Email Address. However, patients with a documented anaphylactic reaction to any medication are at higher risk of a reaction to iodinated contrast.9,10, Many centers screen outpatients with suspected renal insufficiency by measuring serum creatinine one month before administration of contrast agents. The concentration of barium used for fluoroscopy is more than 20 times that of the typical oral contrast suspension for CT. For example, the barium concentration from an upper gastrointestinal series or an enema will produce an artifact on abdominal CT because it is significantly more concentrated than bowel contrast agents used for CT. Barium enemas are also given after abdominal CT to allow time for the less-dense barium to leave the colon. Thank you for your interest in spreading the word on Cleveland Clinic Journal of Medicine. Barium suspensions are not nephrotoxic and can be used safely in patients with renal failure. CT Head or brain with and without contrast Note: MRI Brain with/without contrast is preferred. Specific imaging features exist that help identify the numerous forms of infection in the bones and soft tissues, and CT is invaluable for detecting deep complications of cellulitis and pinpointing the anatomic compartment that is involved by an infection. The most common contrast agents used with CT imaging are barium- and iodine-based. In uncomplicated cellulitis, CT demonstrates skin thickening, septation of the subcutaneous fat, and thickening of the underlying superficial fascia. Assessment of interstitial lung disease does not require use of IV contrast; rather, a tailored protocol with thinner slices and non-contiguous expiratory images can be used to evaluate for air-trapping and dynamic airway compromise (Figure 4). The choice of contrast agent depends on route of administration, desired tissue differentiation, and suspected diagnosis. 2021;50(12):2319-47. 2007 Nov-Dec;27(6):1723-36. doi: 10.1148/rg.276075033. Would you like email updates of new search results? CT is the most sensitive modality for soft-tissue gas detection, and compared with radiography, CT is superior to evaluate the extent of tissue or osseous involvement, show an underlying (and potentially more remote) infectious source, and reveal serious complications such as vascular rupture complicating tissue necrosis [ 10, 13 - 20 ]. IV contrast may be used to visualize vasculature as well as the internal organs of the abdomen and pelvis. Additionally, systemic features such as fevers and rigors may also be present. x]6}W&VqeYjc=ZZgvmH]"2EV"KL D~x9n_O=~on~{,Je|Sn*nqis7^xgi| RUSpEzs_^c?nRW%74|q)PB#g3F|k9/tp8.r#5zv+t3/z,$f S$Uz`X, Suspected Osteomyelitis, Septic Arthritis, or Soft Tissue Infection (Excluding Spine and Diabetic Foot). CT is helpful in guiding surgical debridement and drainage by evaluating the extent of soft tissue and osseous involvement, identifying the potential infectious source and identifying potential complications including vascular rupture or tissue necrosis.1, 2,13,22 MAGNETIC RESONANCE IMAGING The information provided is for educational purposes only. Fortunately, orbital fat provides intrinsic background contrast, and most orbital pathologies can be easily visualised without infusion of a contrast medium. These experts are usually happy to help select the correct test for your patient. Initial radiographs show soft tissue gas (without puncture wound) or are normal with high clinical suspicion of necrotizing fasciitis. At our institution, the CT protocol includes concomitant injections in the upper-extremity veins, with imaging timed for venous phase enhancement (pulmonary venogram). Diagnosis of necrotizing soft tissue infections by computed tomography. It is important to tell the technician and your doctor if you have had a previous allergic reaction to iodinated contrast. [18F]Fluoride Positron-Emission Tomography (PET) and [18F]FDG PET for Assessment of Osteomyelitis of the Jaw in Comparison to Computed Tomography (CT) and Magnetic Resonance Imaging (MRI): A Prospective PET/CT and PET/MRI Pilot Study. Nurse practitioners must be familiar with the contraindications for CT contrast administration. At the time the article was created The Radswiki had no recorded disclosures. All rights reserved. Ultrasonographic screening of clinically-suspected necrotizing fasciitis. Below is an overview of the following CTA studies and their indications: Abdominal Aorta (CTA Abdomen) - Aneurysm, dissection, post stent grafting, renal artery stenosis, metastatic stenosis The .gov means its official. Order "HAND" if entire wrist and hand. Negative studies or nonspecific findings in the context of high clinical suspicion for necrotizing fasciitis, should be treated promptly as this is a clinical diagnosis. However, contrast may be helpful if there are concerns about complications such as chest wall involvement, where contrast enhancement may help further delineate the extent of complications. Cellulitis. These reactions are relatively rare and are usually mild but occasionally can be severe.9 Anaphylactoid reactions have an unclear etiology but mimic allergic reactions, and they are more likely to occur in patients with a previous reaction to contrast and in patients with asthma or cardiovascular or renal disease. Dr. Amy Levine answered. Although a very uncommon soft-tissue infection, it has significant mortality up to 7080% and constitutes a life-threatening surgical emergency.1, 2 The most important predictor of mortality is a delay in diagnosis, thus it is essential to make a prompt diagnosis.2 Clinically, the findings of necrotizing fasciitis can overlap with other soft-tissue infections including cellulitis, abscess or even compartment syndrome, but pain out of proportion to the degree of skin involvement and signs of systemic shock should alert the clinician to the possibility of necrotizing fasciitis.46 Other red flag clinical findings are listed in Table 1.

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