RESUMO
Focal hyperemia is known to occur in regions of acute cerebral infarction. Presented here are two cases in which SPECT images with 125I-labeled iodoamphetamine demonstrated focal areas of increased tracer concentration associated with cerebral infarction. These results may have important implications regarding the physiology of iodoamphetamine in cerebral infarction and, in particular, whether the distribution of this tracer is related to regional blood flow in this setting. In addition, interpretation of iodoamphetamine images in cerebral infarction should include consideration of this finding.
Assuntos
Anfetaminas , Infarto Cerebral/diagnóstico por imagem , Hiperemia/diagnóstico por imagem , Radioisótopos do Iodo , Idoso , Infarto Cerebral/complicações , Humanos , Hiperemia/etiologia , Iofetamina , Masculino , Pessoa de Meia-Idade , Tomografia Computadorizada de EmissãoRESUMO
Despite frequent cancer metastases to the thyroid gland demonstrated at autopsy, finding of thyroid metastasis in clinical practice is rare. Malignancies most commonly metastasizing to the thyroid are malignant melanoma and carcinoma of the breast, kidney, and lung. Very little is known about thyroid metastases caused by sarcomas. Of these, malignant fibrous histiocytoma (MFH) is one of the most common in adults, with a high rate of metastases. A case of clinically significant thyroid metastasis from primary MFH involving the thigh visualized on I-123 thyroid imaging is reported.
Assuntos
Histiocitoma Fibroso Benigno/secundário , Neoplasias de Tecidos Moles , Neoplasias da Glândula Tireoide/secundário , Terapia Combinada , Histiocitoma Fibroso Benigno/diagnóstico por imagem , Humanos , Masculino , Pessoa de Meia-Idade , Cintilografia , Neoplasias de Tecidos Moles/terapia , Coxa da Perna , Neoplasias da Glândula Tireoide/diagnóstico por imagemRESUMO
To determine the frequency with which liver metastases are visualized on bone scintigraphy, 425 pairs of liver and bone scans, performed within one month of each other, were reviewed. Sixty-three of the 425 liver scans showed metastases. Of these 63, five cases of carcinoma of the colon and six cases of carcinoma of the lung also visualized by Tc-99m MDP scintigraphy. This represented 46% of colon metastases and 15% of lung metastases detected on liver scan. Liver metastases from other primary tumors were not detected on bone scan, but the numbers for these tumors were small. The liver metastases which were detected on bone scan were significantly larger than those which were not. The literature was reviewed and the primary and secondary tumors of liver with uptake of Tc-99m phosphate compounds listed.
