但有时表现查不到原发灶的隐匿性癌（occult carcinoma）或所谓原发灶不明（unknown primary site）的转移癌。前者常见于甲状腺癌；后者为鼻咽癌一种前驱表现形式。
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目的：探讨甲状腺隐匿性癌的诊断与治疗。
Objective:To investigate the diagnosis and treatment of occult thyroid carcinoma(OCT).
结论隐匿性颈淋巴结转移癌多表现为淋巴结周边出现丰富血流，PDI对其具有重要的诊断价值。
Conclusion the occult cervical lymph nodes metastases of cancer show affluent peripheral blood flow. PDI has important value in the diagnosis of the occult cervical lymph nodes metastases.
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