Which of the following describes the Westermark sign in Pulmonary Thromboembolism?: (A) Peripheral Wedge shaped infarct, (B) Pulmonary Oligemia, (C) Prominence of Main Pulmonary Aery, (D) Prominence of Descending Rt Pulmonary aery
Answer is B. Sign in Pulmonary Thromboembolism: * Fleischner sign: enlarged pulmonary aery * Hampton hump:peripheral wedge of airspace opacity and implies lung infarction * Westermark sign:regional oligemia and highest positive predictive value. * Palla sign: enlarged right descending pulmonary aery * Chang sign: dilated right descending pulmonary aery with sudden cut-of