The early (dynamic) and late (static) renal images obtained with 99mTc-dimercaptosuccinic acid (DMSA) were utilized to evaluate renal cortical malignant tumors in 30 cases of renal cell carcinoma each of which had been confirmed by operation or autopsy. Early images, performed 20--50 seconds after radionuclide administration, demonstrated abnormal vascular pools in the cortex. A cold area without DMSA uptake was demonstrated on the 2-hour or late images, reflecting a non-functioning renal mass. Lesions demonstrated with combined early and late images showed a good correlation with those demonstrated by renal angiography in 25 out of 27 cases. However, when almost all the renal tumor was replaced by necrotic lesions, the early image did not reveal hypervascularity. When a highly vascular renal tumor extended to the perinephric tissues, the tumor area was sometimes overestimated on the early image. It is almost impossible to diagnose renal cell carcinoma using radionuclide imaging alone. However, 99mTc-DMSA renal studies, using both early and late imaging, have proven to be a useful, noninvasive adjunct in the detection of malignant cortical lesions.

Adenocarcinoma↗

PubMed1979

Accumulation of 201Tl-chloride in a parathyroid adenoma.

A 201Tl-chloride sacn was performed on a patient with primary hyperparathyroidism. 201Tl-chloride accumulated in the region of the right lower thyroidal pole and a diagnosis of parathyroid adenoma was confirmed intraoperatively. 201Tl-chloride imaging of a hyperfunctioning parathyroid gland seems to be useful for the detection and preoperative localization of a parathyroid adenoma.

Adenoma↗

PubMed1979

Changes in sex hormones and calcium regulating hormones with reference to bone mass associated with aging.

Measurement of bone mineral content (BMC), intestinal 47Ca absorption, and calcium regulating hormones and sex steroids in serum were performed on 32 healthy aged subjects and 26 control young subjects. In BMC, there was a progressive fall after age 40, with the rate of decrease being greater in women than in men. A significant correlation was observed between BMC and testosterone in the men and between estrogens and BMC in the women, suggesting the possible importance of testosterone in men and estrogens in women in maintaining bone mass. Plasma PTH showed no change with age. However, the reserve capacity of the parathyroid was significantly reduced in the aged women. Serum levels of ionized calcium were low in aged subjects, indicating a possible alteration with age in the feedback control between ionized calcium levels and parathyroid hormone secretion. C-cell funtion was also decreased with age. Plasma 1,25-(OH)2D and 47Ca absorption tended to decrease with age. Age-related bone loss could be a reflection of the interaction of these hormonal imbalance occurring with age.

Adolescent↗

PubMed1979

[99mTc-2-mercaptopropionylglycine: different biliary excretion behavior in different animal species (author's transl)].

Labeling of 2-mercaptopropionylglycine (2-MPG) with 99mTc, was studied and its chemical characteristics were examined. Further, biliary excretion behavior of this complex was comparatively estimated in mice, rats, and rabbits. 99mTc-2-MPG was rapidly excreted in large quantities into the bile in mice and rats: within 1 hr after injection, 51% of the injected dose was recovered from the bile in rats. On the other hand, the ligand exchange reaction between this complex and penicillamine indicates that a low hydrolyzed 99mTc species is coordinated with 2-MPG. These results suggest that a low hydrolyzed 99mTc is an effective feature in biliary excretion behavior of 99mTc compounds. Another interesting in vivo behavior of 99mTc-2-MPG is the difference observed in mice and rabbits: in mice, very high 99mTc activity is concentrated in the gallbladder and the clearance from tissues other than the gallbladder is rapid, whereas in rabbits, although a rapid and high excretion into the gallbladder is observed, a considerable high 99mTc activity is retained in the liver and the kidney. One reasons for this different in vivo behavior is the low stability of this complex at high dilution: a big animal has the large dilution volume which lead to higher decomposition estimated by the higher liver and kidney retention or the lower bile excretion. In conclusion, studies carried on 99mTc-2-MPG showed a good biliary excretion behavior but an in vivo unstableness in big animals.

Amino Acids, Sulfur↗

PubMed1979

[Fundamental and clinical evaluation of CIS TBG radioimmunoassay kit (author's transl)].

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Adolescent↗