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Click Initial CTPA image of a 22 year old female with pneumomediastinum showing the presence of air dissecting tissue planes in mediastinum (pointing arrow). CTPA was performed with Siemen`s somatom sensation 64 slices, 180 mAs and 120 kV energy, plane was axial; slice thickness was 1.5 x 1.5 mm with 70mls ultravist 370 contrast used. The lumen of the oesophagus and trachea appeared intact throughout and there was no evidence of pulmonary embolus.