RESUMEN
A case of primary Ewing sarcoma involving the occipital bone with an unusual radiographic feature--markedly thickened bone--is described. Magnetic resonance imaging was more helpful than CT in determining the lesion extent due to lack of bone artifact and since it showed the precise relationship of the neoplasm to the tentorium on direct coronal imaging.
Asunto(s)
Imagen por Resonancia Magnética , Hueso Occipital/patología , Sarcoma de Ewing/diagnóstico , Neoplasias Craneales/diagnóstico , Adolescente , Humanos , Masculino , Tomografía Computarizada por Rayos XRESUMEN
Magnetic resonance imaging provides exciting new perspectives of a broad variety of conditions, including spinal tumors, disc disease, bony changes and degenerative disorders. This technology provides a view of anatomic and pathologic changes in the spinal cord without exposing the patient to ionizing radiation. Disease processes identified only indirectly by other imaging modalities can now be directly identified by magnetic resonance imaging.
Asunto(s)
Espectroscopía de Resonancia Magnética , Enfermedades de la Columna Vertebral/diagnóstico , Adulto , Anciano , Astrocitoma/diagnóstico , Femenino , Humanos , Lactante , Desplazamiento del Disco Intervertebral/diagnóstico , Masculino , Neoplasias de la Médula Espinal/diagnóstico , Neoplasias de la Columna Vertebral/diagnósticoRESUMEN
We designed, built, and tested a positron emission tomograph (PETT IV) capable of providing seven slices of the human body simultaneously. PETT IV utilizes a moving hexagonal array of 48 scintillation detectors placed around the subject. Each detector consists of a cylindrical activated sodium iodide crystal optically coupled to two photomultiplier tubes. The multislice capability is achieved by comparing the light outputs of the two photomultiplier tubes in each detector. The images are displayed either as transverse or as longitudinal tomographic sections. This system provides high sensitivity and resolution, and permits rapid and accurate three-dimensional imaging of the head and body.