What does this man have?

Case Identification

Case ID Number
Position within the bone
Benign or Malignant

Clinical case information

Case presentation

This 32 year old Nicaraguan man has multiple lumps on his bones. The one behind his left neck has been growing and is bothering him. He says 5 of his 8 brothers and sisters also have this problem. What does he have? What is the cause of the growth of the tumor behind his neck? What is the correct treatment for this tumor?

Radiological findings:
No xrays are needed to make this diagnosis - the p history and the photos of the patient are all you should need.
Special Features of this Case:
The patient was treated at the HEODRA hospital in Leon, Nicaragua