الفهرس 
Introduction and Aim of the workOnly 14 pages are availabe for public view
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Abstract
This study was performed in the period from October 2013 to August 2016 on 126 patients aged from 18 to 98 years old.
The 126 patients had 132 peripheral pulmonary lesions. Patients were divided into 2 main groups; group I having benign lesions that was subdivided into 3 subgroups; group Ia patients with pneumonia, group Ib patients with lung abscess and group Ic patients with pulmonary embolism and group II having malignant lesions that was subdivided into 2 groups; group IIa with apparent mass and group IIb with apparent collapse due to a more central mass.
Gray scale examination showed that air bronchogram, breath dependent motion and central bronchial reflex were more presented in benign lesions. Pleural thickening or irregularity were present more in the malignant lesions and fluid bronchogram was not detected in any benign lesion while, it was present in 13.9 % of malignant lesions.
Regarding malignant lesions, regular margin, condensed air bronchogram and fluid bronchogram were significantly higher in the collapse group.
More pneumonia and lung abscess lesions were presented by irregular margin, while pulmonary embolism cases were more presented by a regular margin and homogeneous echotexture was higher in pulmonary embolism than both pneumonia and abscess. Central bronchial reflex was detected only in pulmonary embolism cases.
Color doppler sonographic findings showed that scanty vascularity was presented more in the group of malignant lesions, while marked vascularity was presented more in the benign lesions’ group, with most benign lesions showing triphasic flow while more malignant lesions showed monophasic flow and continuous waves were shown only in malignant lesions.
The mean of the PI and RI were higher in benign. On the other hand, the mean of EDV was higher in the malignant lesions. Resistive index (RI) had area under the curve of 0.642 for diagnosing benign lesions and 0.327 regarding diagnosis of malignant.
Pulsatile index (PI) showed area under the roc curve of 0.668 for diagnosis of benign lesions and 0.311 for malignancy diagnosis.
The current study showed area under the roc curve of 0.447 regarding PSV for diagnosing benign lesions and 0.556 for diagnosis of malignant lesions.
When a cut-off value of EDV ≤4.57 cm/sec. is used for diagnosis of benign lesions, it showed area under the roc curve of 0.374. Regarding diagnosis of malignant lesions cut-off value of >4.57 cm/sec. area under the curve of the roc curve of 0.686.
Chest CT showed the highest diagnostic accuracy for diagnosis of all studied lesions, followed by CXR for diagnosis of pneumonia and lung abscess and gray scale US for pulmonary embolism diagnosis.