Biomedical subjects
Publications and source records attributed to A Tsuchiya.
Two cases of second primary breast cancer following thyroid cancer are presented. The association between breast and thyroid cancer is reviewed from the literature, but no common etiologic factor is found between the two neoplasms in our experience.
A case of breast cancer concurrent with hyperthyroidism was reported and the relation between breast cancer and thyroid dysfunction was reviewed. It has been frequently suggested that the incidence of breast cancer is decreased in patients with hyperthyroidism and breast cancer coincidental with hyperthyroidism is rare.
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When the cervical tumor mimics thyroid carcinoma, some cases are shown to be the primary carcinoma of other site. Four cases of secondary thyroid carcinoma, of which primary sites are adjacent organ, are studied. The characteristics of histology are squamous cell carcinoma. Squamous cell carcinoma of which primary organ seems to be thyroid often discloses metastatic neoplasm originated from the adjacent organs. Since chronically inflammatory lesion is recognized concurrently, abnormal thyroid is suggested to be congenial soil for malignant growth. Our experience indicates that the secondary carcinoma due to direct extension should be considered on diagnosing squamous cell carcinoma of the thyroid.
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Diffusion-weighted imaging (DWI) provides unique information about various pathological changes of the brain. DWI is sensitive for the detection of hyperacute infarcts, and useful in distinguishing acute or subacute infarcts from chronic infarcts. DWI is useful in differentiating cytotoxic edema from vasogenic or interstitial edema, which may help to determine prognosis. DWI is useful in differentiating cystic or necrotic tumors from abscesses or epidermoids. DWI can discriminate nonenhanced tumor infiltration from vasogenic edema, and differentiate dysmyelination from demyelination.