RESUMEN
A case of a 31-years-old male with pathologic rupture of the spleen and hemoperitoneum, caused by a primitive hemangiosarcoma and occurred during a weight-lifting is described. A metastatic involvement of the liver was also noted. The patient was splenectomized and died within 2 months.
Asunto(s)
Hemangiosarcoma/complicaciones , Neoplasias Hepáticas/complicaciones , Neoplasias del Bazo/complicaciones , Rotura del Bazo/etiología , Adulto , Humanos , MasculinoAsunto(s)
Fibrosarcoma , Mesenterio , Neoplasias Peritoneales , Anciano , Humanos , Masculino , Persona de Mediana EdadAsunto(s)
Colon Sigmoide/patología , Colon Sigmoide/cirugía , Adulto , Femenino , Humanos , Masculino , Persona de Mediana EdadAsunto(s)
Rotura Gástrica , Adulto , Femenino , Humanos , Masculino , Persona de Mediana Edad , RadiografíaRESUMEN
A Makri-Miller approximation to the exact propagator and the improved split-operator propagator proposed by Drozdov are implemented within the diffusion Monte Carlo method for the simulation of boson systems, and confronted with the Trotter formula and with the importance sampling technique. As a preliminary approach, we compute analytically the time step bias of the mean energy for the different propagators in the simple case of the harmonic oscillator. These results indicate the improved split-operator propagator as the most accurate. Simulations on one- and three-dimensional model systems confirm the analytical results showing that this propagator is very efficient in reducing the time step bias, therefore improving the efficiency of the algorithm.