[Studies on the diagnosis of uterine tumor by 201-thallium-chloride (author's transl)].

Cases of gynecological tumor mainly uterine benign and malignant tumors were evaluated using 201Thallium-Chloride (201Tl-Cl) after intravenous injection. The positive scans of 100% in 42 cases of uterine myoma including 29 cases of leiomyoma, 8 cases of adenomyosis and 5 cases of combined type myoma, also 100% in 8 cases of body cancer indicating adenocarcinoma and 25% in 12 cases of cervical cancer indicating squamous cell carcinoma were observed. The smallest focal lesion for the positive scans was needed approximately more 5 cm in diameter in the cases of leiomyoma. The most accumulation of activities was showed in adenomyosis or adenocarcinoma with much adenoid structure in the pathological study. Accumulation of 201Tl in uterine benign and malignant tumors was suggested the analog of potassium. The mechanism of tumor affinity was correlated to perfusion volume and the acceleration of the potassium metabolism in a tumor. On the other hand, we suggested the diagnosis of the malignant uterine tumor should be attended due to 201Tl was accumulation also in the benign uterine tumor. The uterine scanning using 201Tl-Cl was acknowledged to be very useful and safe indicating early detection at 20 minutes after the injection, (non-traumatic procedure and non-visualized bone tissues). In conclusion, this radioisotopical procedure was indicated high value of screening examination in the diagnosis of uterine tumor.