Superior herniation of the thymus into the neck--a familial pattern.

Abstract excerpt

Superior herniation of normal mediastinal thymus into the anterior neck is a rare cause of neck masses in children. It is defined as intermittent migration of the broadest part of the normal thymus out of the thorax into the suprasternal region during Valsalva maneuver with an increase in the intrathoracic pressure. The fact that the mass apparent only during Valsalva maneuver and typical ultrasound...

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