Life-threatening subcutaneous hematoma.

Neurofibromatosis is rare genetic disorder that predisposes patients to tumor formation. Although the clinical manifestations are variable, vascular malformations are known to occur. We report a case of life-threatening massive subcutaneous hemorrhage after minor trauma in a patient with neurofibromatosis. Physicians need to be aware that bleeding from vascular malformations, even in the subcutaneous space, may be life threatening.