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PubMed2002

[Renal cell carcinoma metastasis in a microfollicular adenoma of the thyroid gland].

A 60-year-old woman had a nephrectomy of her left kidney because of a renal cell carcinoma. She came to us for an oncologic F-18-fluordeoxyglucose-positron emission tomography (F-18-FDG-PET). In the positron emission tomography there was a pathologic fluordeoxyglucose-uptake in the left thyroid gland lobe. Thyroid investigation and Tc-99 m pertechnetate scintigraphy of the thyroid gland was done. It showed a hyperfunctioning nodule in the left thyroid gland lobe. Surgery was suggested. Histology showed a metastasis of a clear cell renal carcinoma in a microfollicular adenoma of the thyroid gland--a very rare combination.

Adenoma↗
PubMed1993

[Ectopic thyroid gland tissue in the liver].

Heterotopia of thyroid gland can be seen very seldom in humans. Most frequently ectopic thyroid tissue is found in the middle line of neck and chest. Ectopia of thyroid tissue caudal of the diaphragm is an exceptionally rare finding. An explanation results out of the embryology of the thyroid gland development. Reviewing the literature we could find only one case of accessory thyroid tissue in the region of the hepatic porta, it was found at autopsy. In the present case report we describe a 58-year-old woman who had an indistinct tumor in the hepatic porta which was successfully removed. Histologic findings was that of aberrant normal thyroid tissue.

Choristoma↗
PubMed1984

[The normal thyroid gland in the scintigram: size and form variants, thyroid dystopia].

Quantitative data about the size of the normal thyroid gland are presented: height, width and area of the right and left lobe are scintigraphically different. The calculated weight varies depending on the correction factor. Displaced thyroid tissue is found in the center line, whereas iodine accumulating tissue located in the lateral neck should lead to a suspicion of carcinoma.

Adolescent↗
PubMed1989

The blood vascular architecture of the rat thyroid gland: a scanning electron microscope study of corrosion casts.

The blood vascular bed of the rat thyroid gland was reproduced by injection of a methacrylate casting medium and observed with a scanning electron microscope. The rat thyroid gland received the superior and inferior thyroid arteries and emitted the superior and inferior thyroid veins. Anastomosis between the interlobular arteries or between the interlobular veins was frequently observed in the thyroid gland. The arteriovenous anastomosis was rarely observed between the terminal branches of the lobular arteries and veins. The thyroid blood vascular bed was divided into lobular units which consisted of basket-like capillary networks surrounding the thyroid follicles; a small lobular unit consisted of a few networks, whereas a large one of fifty or more networks. Sizes and forms of the networks varied widely in each case. However, the networks in the superficial layers of the lateral parts of the thyroid gland were typically most developed. Regardless of its size and form, each network always received a proper efferent vessel continuous with the lobular vein, though it was sometimes provided with an accessory afferent or efferent vessel. Only occasionally were the adjacent networks fused with each other or connected by transfollicular capillaries. Thus, the present data suggest that each follicular capillary network is a fairly independent functional-unit in the thyroid microcirculation. The capillaries of the network were sinusoidal in nature and sometimes protruded fine projections which indicated the neogenesis of capillaries. The blood vascular bed of the newborn rat thyroid gland was not always differentiated into basket-like capillary networks.

Animals↗
PubMed1987

Follicle structure-dependency of thyroglobulin and thyroxin staining in the thyroid glands of Graves' disease.

H.E. morphology of the thyroid glands from 170 patients with Graves' disease was studied, and the thyroid follicles were classified into two main groups: (1) F pattern, in which the follicles show circle/ellipse on cut sections; (2) P pattern, in which the follicular epithelium protrudes into the lumen or a follicle, is accompanied by proliferation of tubular or microfollicular structures. Studies on three serial sections of 88 thyroid glands stained with hematoxylin and eosin, thyroglobulin (TG), and thyroxin (T4), respectively, revealed the followings: (i) TG/T4 staining is dependent on the follicle structure (i.e., F or P); while the epithelium and colloid including scalloped vesicles in F follicles generally exhibited a direct relationship between TG and T4 staining, those in P follicles often showed an intense TG, but negative T4 staining. (ii) The results of morphological and immunohistochemical studies of P follicles among the cases are consistent with the view that P follicles are in the process of proliferation of immature daughter follicles from a main follicle and of their maturation. (iii) P follicles of Graves' thyroid glands were evaluated as possible non-neoplastic counterparts of well-differentiated follicular and papillary tumors.

Adult↗
PubMed1977

Tumour metastasis to the thyroid gland.

Ten cases of tumour metastasis to the thyroid gland are reviewed. Thyroid involvement implies disseminated malignant disease, but metastatic tumours may simulate a primary thyroid tumour. It is suggested that thyroid involvement by metastasis is more common than previously assumed. Needle biopsy of the thyroid gland permits accurate histopathological diagnosis.

Adult↗
PubMed1986

The influence of castration and methimazole on deoxyribonucleic acid content of the pituitary and thyroid glands of White Leghorn cockerels.

The pituitary gland of birds is known to increase in weight with castration and decreases with chemical thyroidectomy. Whether these changes are due to alterations in mitotic activity or to cell size changes has been examined by measurement of deoxyribonucleic acid (DNA) and protein content of these glands. The DNA content of the enlarge pituitary of castrated cockerels is the same as that in the pituitary of normal cockerels. The pituitary size increase may be due to an increase in gonadotrope size including any part of the gonadotrope population which may be obtained by recruitment of other basophils. The retardation in pituitary size and DNA content with methimazole treatment is probably due, at least in part, to growth retardation but may also be due, in part, to the conversion of larger basophils to smaller thyrotropes.

Animals↗