RESUMEN
Fifty-two fracture sites were evaluated by bone scintigraphy after acquiring similar views of the lesions at 4 and 24 h following technetium-99m methylene diphosphonate administration. After calculating 24/4 h radio-uptake ratio (RUR) and using 1.15 as the critical point of separation, fresh healing lesions could be separated from old healed fractures persisting as 'hot spots' with a sensitivity of 100% and specificity of 82%. The 24/4 h RUR technique is a new approach in measuring the osteoblastic activity at the lesion site. The technique appears to have clinical significance in the detection and follow up of the healing status of occult fractures where radiological procedures are of limited value.
Asunto(s)
Huesos/diagnóstico por imagen , Curación de Fractura , Adolescente , Adulto , Femenino , Fracturas Óseas/diagnóstico por imagen , Humanos , Masculino , Cintigrafía , Sensibilidad y Especificidad , Medronato de Tecnecio Tc 99mAsunto(s)
Procesamiento de Imagen Asistido por Computador , Enfermedades de la Tiroides/diagnóstico por imagen , Glándula Tiroides/diagnóstico por imagen , Adolescente , Adulto , Anciano , Niño , Femenino , Humanos , Masculino , Persona de Mediana Edad , Angiografía por Radionúclidos , Pertecnetato de Sodio Tc 99m , Enfermedades de la Tiroides/fisiopatología , Pruebas de Función de la TiroidesRESUMEN
The rare presentation of hyperthyroidism caused by an intrathoracic goiter with a normal-sized cervical thyroid gland is described. The toxic intrathoracic goiter demonstrated avid uptake of [131I] and [99mTc]pertechnetate, with comparatively faint isotopic accumulation seen in the cervical thyroid. A chest roentgenogram and radioisotope scan should be mandatory in cases of hyperthyroidism having no cervical thyroid enlargement to explore the possibility of a toxic intrathoracic goiter.
Asunto(s)
Bocio Subesternal/complicaciones , Hipertiroidismo/etiología , Femenino , Bocio Subesternal/diagnóstico por imagen , Humanos , Hipertiroidismo/diagnóstico por imagen , Radioisótopos de Yodo , Persona de Mediana Edad , Cintigrafía , Pertecnetato de Sodio Tc 99mAsunto(s)
Gasto Cardíaco , Contracción Miocárdica , Infarto del Miocardio/diagnóstico por imagen , Volumen Sistólico , Adulto , Anciano , Eritrocitos , Femenino , Ventrículos Cardíacos/diagnóstico por imagen , Humanos , Masculino , Persona de Mediana Edad , Cintigrafía , Pertecnetato de Sodio Tc 99mRESUMEN
A computer-assisted radionuclide perfusion study was performed in 25 cases of solitary 'cold' thyroid nodules to assess their vascularity relative to that of normal adjoining thyroid tissue. Hypervascularity was seen in 3 malignant nodules; 1 follicular adenoma also showed increased vascularity. The 21 nodules demonstrating equal vascularity or avascularity with respect to normal thyroid tissue were benign in nature. Computer-generated time-activity curves were helpful in distinguishing hypervascular from equally vascular nodules. This technique, in conjunction with clinical evaluation, can be of value in deciding whether patients should undergo surgery or receive conservative management.