ニジマス (Salmo irideus GIBBONS) に発生せる滑平筋腫の一例

概要

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A case of leiomyoma was found in rainbow trout obtained from the Experimental Station of Trout Culture of Samegai, in Shiga Prefecture, in January 1953. This fish was fixed in aq. soln. of ca. 10% formalin, and was observed histopathologically. The tumour situated on the lower jaw of oral cavity, something columner protuberance in shape, measured 4.0cm. long, 4.6cm. broad, and 3.7cm. high. It was composed with twelve polypes developed from a subserosa between oral epithelium and ceratohyal bone. The bite by upper jaw teeth was penetrated certain aquatic mildew. The cut su face at the middle part was shown the revolutions of smooth muscular tissue being light pincish white in colour, and seemed to be hardier than normal elastic tissue. Micro-scopic structure of this tumour consisted of a large mount of well-defferentiated leiomyofibres, forming revolutions as myomatous nodles, together with myomatous germ cells. Polypes were en-capsulated, and we e relatively poor in vascular supply, but rich in fibrous stroma.Regressive proceises were little, but the the various kinds of degeneration in hyalin-, fat-, and other substances were found. As mentioned above, this tumour was named “leiomyoma”.
公益社団法人日本水産学会の論文