Intravascular Papillary Endothelial Hyperplasia (Masson's Tumor) of the Hand.

A nonspecific soft tissue mass of the hand can be difficult to diagnose due to the multitude of possible etiologies. In this case, we discuss our experience in diagnosing and treating intravascular papillary endothelial hyperplasia, or Masson's tumor, of the hand. The wide range of differential diagnoses and the morphological resemblance to angiosarcoma make Masson's tumor an important clinical entity to understand. The purpose of this study is to familiarize the reader with the appropriate diagnostic and treatment modalities that allow the clinician to recognize Masson's tumor, differentiate it from similar clinical entities, and institute the appropriate management regimen.