Osteosarcoma, also called osteogenic sarcoma, is a extremely rare type of cancer that can develop in the metacarpals and phalanges of the hand. Primary bone tumors are exceptionally unusual in the hand, but among these hand lesions, osteosarcoma is the most common. It also is one of the most common malignancies after cancer treatment in children. Osteosarcoma of the hand usually presents with swelling and pain. Osteosarcoma of the hand has no preference for right or left hand; no preference for male or female and it occurs in all age groups. The metacarpals and phalanges are equally involved.8 Osteosarcoma is highly invasive, and 85% of patients with osteosarcoma have metastases. Teenagers are the primary affected age group among typical patients, which include those aged 10–30 years. But osteosarcoma can occur at any age; about 10% occurs in people >60 years old. The diagnosis is often delayed in youth, because symptoms of pain and swelling are common in active people. Recent reports have highlighted radiation and extraskeletal osteosarcomas of the hand. These very rare lesions typically occur in older individuals.1-8
Pathophysiology
- Most osteosarcomas are not caused by inherited mutations, but rather are the result of genetic changes during life.
- Radiation therapy can damage DNA, but other changes are not understood.
- There are no known lifestyle or environmental causes of osteosarcoma.
- Histopathologic grading
- Low grade: slowest-growing; look like normal bone and have few dividing cells
Subtypes:
- Parosteal
- Intramedullary or intraosseous well differentiated and are the most uncommon
- Periosteal are high grade: fastest-growing lesions; do not look like normal bone, and dividing cells proliferate
- Osteoblastic*
- Chondroblastic*
- Fibroblastic*
- Mixed
- Small cell
- Telangiectatic
- High-grade surface (juxtacortical high grade)
- Pagetoid
- Extra-skeletal
- Post-radiation
*Most common among high-grade osteosarcomas
Related Anatomy
- Most osteosarcomas develop around the knee (50%); the proximal humerus is the next most common site.
- Malignant bone tumors are rare in the hand but osterosarcoma is the most common bone cancer that occurs in the hand
- Osteosarcoma can develop in any bone, including the pelvis/hips, shoulder, and jaw.
- If the cancer recurs, it is usually in the lungs.
Incidence and Related Conditions
- Approximately 800 new cases of osteosarcoma are diagnosed annually in the United States.
- The overall incidence rate is 4% in the 0- to 14-year age range and 5% in the 0- to 19-year age range, per million persons.
- Among childhood cancers, osteosarcoma is ranked eighth in general incidence (2.4%).
- Patients with the following are at increased risk of developing osteosarcoma: bone disorders including Paget disease; inherited cancer syndromes including retinoblastoma, Li-Fraumeni syndrome, and Rothmund-Thomson syndrome.
Differential Diagnosis
- Cancerous bone tumors
- Chondrosarcoma
- Chordoma
- Fibrosarcoma
- Malignant fibrous histiocytoma
- Malignant giant cell tumor of bone
- Benign bone tumors
- Chondromas
- Osteochondromas
- Osteomas