指甲下结石极为罕见。原因亦不清楚,兹将所见一例报告如下。患者男性,50岁,从事木工已卅年,常用右手,近十年来觉左手指甲(第一、二及三指)日趋增厚,因无何不适感觉,故未就诊。近月来该处有发木感觉,特来求医,检查见左手姆指、食指及中指三指甲前端下形成均匀结石,灰白色,坚硬,紧贴于手指甲下,中间较厚,向两侧逐渐变薄,触之有实体感,轻敲之铿锵有声,该三指之指甲向中间突起,前端尤著,曲度大增,指甲呈灰褐色,干枯无华。前端两侧边沿离开甲床,与结石紧贴无间,结石厚度以中指最著、食指次之,姆指较薄。(见照片),指甲中部及根部未见离床,无触痛及压痛。 Nails under the stone is extremely rare. The reason is not clear. We will report the following one. Male patient, 50 years old, has been engaged in carpentry for more than a year, commonly used right hand, felt the left hand nails (first, second and third finger) increased in the past decade, because no discomfort felt, so no treatment. In recent months, there is a feeling of hair wood, especially to seek medical examination, see the left hand thumb, index finger and middle finger below the three nails to form a uniform under the stones, gray, hard, close to the fingernail, the middle thick, to both sides Gradually thinning, touching a sense of solidity, sonorous sound tapping, the three finger nails to the middle of the protrusion, especially the front, the curvature increased significantly, nail was gray-brown, dry without. Front edge of the left side of the bed away from the nail, and stones closely linked to the thickness of the middle finger the most, the index finger second, thumb thinner. (See photo), nails and roots in the middle of no bed, no tenderness and tenderness.