Rosai Dorfman disease of soft tissue.

Rosai Dorfman disease (RDD), or sinus histiocytosis with massive lymphadenopathy, is a well-described phenomenon in lymph nodes and other organs. However, it has only recently been described as a distinct entity in soft tissue. Here we present what we believe to be the first report of a case of multiply recurrent RDD occurring exclusively in the soft tissue. Recognition that RDD of soft tissues can be a pernicious locally recurrent lesion is important and suggests that an aggressive surgical approach to this lesion may be warranted.