Thyroid puncture result reports generally have a diagnosis of the cancerous tissue type, along with a pathologic description of the cancerous tissue type. The main histologic types of thyroid cancer are papillary carcinoma, follicular carcinoma, medullary carcinoma and undifferentiated carcinoma. 1. Papillary carcinoma: It is the most common type, accounting for 70%. To the naked eye, it is spherical, without envelope, gray and hard. Under the microscope, there are many branches in the papillae, and there are calcified vesicles in the intervascular stroma in the papillae; the nuclei of the cancer cells are in the form of transparent hairy glass, with no nucleolus, and pseudo inclusion bodies are formed in the nuclei. 2. Follicular carcinoma: accounting for about 20% of the cases; in naked eye, the cancer tissue is nodular with peritoneum, and in some cases the peritoneum is incomplete; the cut surface is grayish white and soft; under the microscope, the peritoneum is infiltrated by cancer cells, and the cancer tissue can be seen as follicles with different differentiation degrees, and the poorly differentiated ones are in the form of solid nests and sheets with few follicles. 3. Medullary carcinoma: less than 10%, single or multiple, with pseudo-coated membrane, grayish white or yellowish brown, soft. Under the microscope, the cancer cells are round, polygonal or spindle shaped, and the nuclei are not obvious; under the electron microscope, intracellular neuroendocrine granules of uniform size can be seen. 4. Undifferentiated carcinoma: less common, on naked eye, the mass has no peripheral membrane, extensive infiltration, gray surface, often with hemorrhage and necrosis. Under the microscope, the shape and size of cancer cells are different, and there are many nuclear schizophrenia. There are various histologic types such as small cell type, spindle cell type, giant cell type and mixed cell type. Thyroid puncture results should be judged by a professional pathologist to provide a report.