It is a rare tumor, usually occurring in children and young adults under 25 years of age.

These are rare tumours that can occur in any part of the human body.

It is a very rare tumor, with only a few dozen cases reported in the literature to date.

Dermatofibrosarcoma is a rare tumor, but many of the reported cases arise in children.

These rare tumors are most common in infants and young children.

"The wish to have a child dominates the fear of a rare tumor that does not cause death."

It is an extremely rare tumor, with less than 100 cases reported worldwide.

This is a rare tumor, presenting over a wide age range, but usually in the 3rd to 5th decades of life.

Myxomas are the most common type of these rare tumors.

It is a rare tumor with only several hundred new cases per year throughout the United States.