Abstract
The coagulation at the wound of the traumatic spleen make a false negative findings. We created a wound in the mongrel dog's spleen and observed it by ultrasonography at regular intervals in this experiment. The pathological changes of spleen were surveyed, too. Kawauch i and et al. reported the wound in one patient with splenic rupture couldn't be detected by ultrasonography because the cogulation at the wound had the same echo level as spleen. After removing the coagulation, the wound was possible to be located exactly. The purpose of this experiment is to elucidate the false negative findings in ultrasongraphy and to compare the spleen tissue to the change of coagulation at the wound timely by microscope. The mongrel dog under general anesthesia was incised in the abdomen. The spleen was placed into a plastic bag filled with the deaired water with the splenic artery and vein still intact. An incision was made at the dorsal side of the spleen and was observed by ultrasonography right after incision, 15 minutes, and I hour later respectively. PTAH stain for fibrin was used in the histological specimen inchluding spleen and coagulation. The coagulation at the wound kept the same structure like net from the period right after incision to 24 hours. It is similar to the histological structure of spleen. The sound impedance of the coagulation was assumed to be similar as spleen. It is difficult to distiuguish the coagulation from the spleen in ultrasono graphy.
