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Dear Editor, We present here a case report of a benign seminal vesicle cystadenoma treated with laparoscopic ablation in a 31-year-old man. The clinical presentation, gross appearance, microscopic characteristics, immunohistochemical and ultrastructural findings of this uncommon tumour are discussed.

The austenite transformation characteristics for various warm-rolled pearlite during rapid heating were investigated. The results indicate that the start temperature （Ts） is sensitive to the microstructural feature of pearlite, whereas the dislocation plays an important role in the transformation rate; at the same time, the uniformity of austenite grains is more or less affected by the amount of spheroidized pearlite. A critical effect on the state of austenite grain is created through the influence of initial microstructures on the start temperature of transformation.

为探讨长吻海蛇（Hydrophis platurus）的宏观及微观形态特征，运用经典分类及扫描电镜观察方法，对相关标本的形态特征及鳞片微皮纹结构进行观察，结果表明：标本深色的背面与浅色的腹面具有清晰的分界，吻部明显突出，背、腹部鳞片的形状和大小无明显分别；背部鳞片显微皮纹结构表现为多个耳状结构沿身体纵轴方向交错排列，整个视野呈现为波纹状，耳状结构之间为较深的沟槽，耳状结构侧面布满小孔。标本形态结构符合长吻海蛇形态特征，其鳞片显微皮纹结构与同属眼镜蛇科（Elapidae）的陆上种类，如舟山眼镜蛇（Naja atra）、广西华珊瑚蛇（Sinomicrurus peinani）明显属于不同模式。长吻海蛇鳞片显微皮纹结构表现出显著的水生生活适应特征，此结构特征有利于长吻海蛇在游泳时减少阻力，其沟槽和小孔有利于对海水截留。研究结果认为，蛇类鳞片显微皮纹结构具有明确的分类学意义，但鳞片超微结构差异可能不适合用于推断蛇类系统进化关系。