Failure of a structure that typically follows a cranially directed course during development (for example, the kidney) to ascend or to follow the normal course.
Farlex Partner Medical Dictionary © Farlex 2012
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Two different mediastinal parathyroid glands have been defined in the literature: the first type originates in the neck and descends into the chest with continuing glandular enlargement in the presence of negative intrathoracic pressure; the second type is the outcome of developmental malascent, which usually affects the inferior parathyroid glands or is due to supernumerary parathyroid glands.