Mediastinal Cystic Hygromas

Abstract
Two cases of asymptomatic primary mediastinal cystic hygroma in adults are reported. The CT findings, including: paratracheal and paravertebral location; round, smooth, and sharp outline; homogeneous density with low attenuation number; compression of surrounding tissue without gross invasion: and lack of calcification, together with the superior mediastinal location are sufficiently characteristic to suggest the diagnosis.

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