Cervical thymic cyst is not a common pathology encountered in either an adult or a child. Our case presentation is of an infant girl with a right cervical soft mass. It was totally respected and histological analysis revealed a thymic cyst. The diagnosis of thymic cyst is not possible prior to histological examination. Therefore, in children the disorder should be considered as a differential diagnosis of each cervical soft tissue mass and evaluation of mediastinum should be done for the presence of thymic tissue.
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