Intravascular papillary endothelial hyperplasia: collection of four cases and a review of the literature.

Intravascular papillary endothelial hyperplasia is a benign tumor that rarely presents in the orbit and ocular adnexa. Generally, it occurs as an isolated eyelid mass, not associated with systemic or local disease. Histopathologically, it can be easily confused with angiosarcoma or Kimura's disease. We present our experience with four cases of this tumor in the ocular adnexa, along with a literature review.