Objective To evaluate the clinical value of 18f-fdg PET imaging in the diagnosis of the origin-unknown primary tumor and the consequent influence on therapy.

目的：探讨18f -氟脱氧葡萄糖(18f - FDG) PET显像在原发肿瘤不明患者中的诊断价值以及对治疗方案的影响。

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The medical examiner said a contributing factor in Lee's death was "cachexia of unknown origin, " or malnutrition.

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Unlike newspapers though, which are of unknown origin, each track in Undersound will have a birth-place, giving added meaning.

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This expulsion was instead the result of an abrupt-onset stomach ailment of unknown origin that left me doubled over in my office for most of Monday morning.

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