Solitary 2

Respiratory System

{"ops":[{"insert":"Diagnosis and reasoning"},{"insert":"\n","attributes":{"header":1}},{"insert":"This elderly man has presented with a solitary pulmonary nodule (SPN) on a chest x-ray, in a background of hemoptysis, chronic cough, and a history of extensive smoking. Examination shows him to be cachectic. These clinical findings are worrisome of lung cancer.\n \nComputed tomography (CT) of the chest is an essential next step. Noncontrast CT is often sufficient for diagnosis of lung cancer. However, administration of intravenous (IV) contrast media is useful to clearly delineate the margins of any lesions (especially if they are centrally located; or if the lesion shows CT attenuation similar to that of adjacent structures); and to also detect if there is local invasion.\n \nHere, CT reveals the nodule to be centrally located within the righ"}]}

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