The Journal of Bone and Joint Surgery

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A Tumor of the Hand

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A thirty-six-year-old right-hand-dominant man was seen because of mild, persistent pain in the region of the metacarpal of the little finger. He apparently had been injured during a game of softball. He had not noted the presence of any mass. The patient had worked in the landscaping business for eleven years. His job involved the installation of watering systems that employed pipes and cement containing polyvinyl chloride. During the first three years of his employment, he spent approximately twenty hours per week handling pipes, cement, and primer. After he was promoted to the position of foreman, his direct exposure decreased to ten hours per week for the next five years and then to less than two hours per week during the most recent three years. The patient stated that he never wore gloves when working.

What is the diagnosis?