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In view of the morbidity and frequency in familial cases an effective screening programme should aim at an early diagnosis of GEP particularly when truncating, especially nonsense mutations are found.

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Cystic adenomas of the parathyroid glands are often misdiagnosed as thyroid cysts or - in the case of extremely elevated parathyroid hormone levels - even as parathyroid carcinoma. The routine preoperative diagnostic tools, such as ultrasonography or (99m)Tc-sestamibi-scintigraphy, cannot clearly distinguish between these entities and might be jeopardized by mediastinal localization, which is not uncommon in parathyroid adenomas with cystic degeneration.