CRP and infection: Therefore, the diagnosis of MTAA is based on a combination of the following criteria: (a) clinical presentation (pain, fever, evidence of concomitant infection, an elderly patient with cardiovascular disease, and/or immunosuppressive state), (b) laboratory findings (raised inflammatory parameters including CRP, leukocytosis, and positive blood culture); and (c) radiological findings on contrast-enhanced computed tomography (CECT) or magnetic resonance imaging (MRI) of the chest.