Bone Tumours: Benign and Malignant Tumours, Symptoms and Diagnosis

Although bone appears hard and unchanging, it is living tissue that constantly renews, repairs and remodels itself. Uncontrolled cell multiplication during this process can produce a mass within or on the surface of bone. Bone tumour is the collective term for these masses. The word tumour alone does not mean 'cancer'; it means a mass of tissue.

Bone tumours are divided into two main groups. Benign tumours do not spread to surrounding tissues; even when they grow, they remain localised and are usually not life-threatening. Malignant tumours may invade nearby tissues and spread through the bloodstream to other organs. Some masses found in bone are not primary bone tumours but spread from disease in another organ; this is considered particularly in older adults, and treatment is planned alongside treatment of the primary disease.

Most bone tumours are uncommon, whereas benign lesions are relatively frequent and often found incidentally on imaging for another reason. 'Something was seen in the bone on the scan' is not bad news in itself; the lesion's imaging characteristics and the patient's findings determine what it is.

Some bone tumours cause no symptoms. When symptoms occur, the commonest are pain, swelling and problems caused by weakened bone. The following findings require detailed assessment:

• Bone pain that worsens at night, persists at rest and becomes progressively more severe
• A palpable, growing hard area or swelling over a bone
• Increased warmth, visible blood vessels or a change in skin colour over the swelling
• A fracture after minor stress without a clear accident (pathological fracture)
• Restricted joint movement, limping or inability to bear weight on the leg
• Swelling accompanied by unexplained weight loss, fever, night sweats and fatigue

Most benign bone tumours are localised and do not spread into surrounding tissue; some stop growing naturally. Common examples include osteochondroma, a prominence on the bone surface; cartilage-derived enchondroma; the small osteoid osteoma, known for night pain; and bone cysts, which form fluid-filled cavities inside bone.

Although a giant cell tumour is considered benign, it can behave aggressively at its site, erode bone and recur after treatment; it therefore needs a specific surgical and follow-up plan. These benign lesions do not all occur at the same age: some appear in childhood or adolescence, such as osteochondromas and bone cysts, while others appear in adulthood, such as enchondromas and giant cell tumours.

Treatment decisions depend more on the lesion's effects than on the lesion itself. Monitoring is generally sufficient for a lesion that does not cause pain, grow or weaken the bone: imaging and examinations are repeated at set intervals. Surgery is considered for lesions that cause pain, thin the bone or increase fracture risk, or obstruct movement. The most common method is scraping the lesion out of the bone (curettage) and filling the resulting cavity with a bone graft or bone cement; plate-and-screw support is added when necessary.

Follow-up matters even with benign tumours because some lesions recur after treatment. Review intervals depend on lesion type, and patients are clearly told which signs require earlier assessment.

Malignant bone tumours are uncommon, but early diagnosis matters. Most malignant tumours originating in bone are called sarcomas; osteosarcoma and Ewing sarcoma usually occur in childhood or adolescence, whereas chondrosarcoma tends to occur later in life. Multiple myeloma and lymphoma, which arise in bone marrow, can also cause malignant bone lesions. Most malignant bone lesions found in older adults are not primary bone tumours but disease that has spread from another organ (metastatic disease), or multiple myeloma; the initial investigation therefore follows a different direction in this age group.

Treatment in this group is not surgery alone. Diagnosis is established by biopsy; the extent of disease is determined using CT, MRI and, when necessary, scintigraphy or PET. A plan is then developed by orthopaedics together with medical oncology and radiation oncology teams: some tumours are treated with medicines before surgery, followed by surgery and completion of treatment afterwards. Surgery aims to remove the tumour with a margin of healthy surrounding tissue while preserving as much limb function as possible; the removed bone segment may be reconstructed with a prosthesis or bone graft.

Outcomes depend on tumour type, stage, location and response to treatment; a general percentage-based promise of success would therefore be inappropriate. The team explains individual expectations once pathology and imaging results are available.

A substantial proportion of bone tumours occur during growth in areas where bone lengthens fastest, such as around the knee, shoulder and upper thighbone. Families most commonly confuse them with sports injuries or growing pains. A child should be seen by a doctor for one-sided pain lasting several weeks, pain waking them at night, persistent limping, a palpable swelling or a fracture after a minor fall.

Many bone lesions in children are benign, and some regress as growth is completed. However, malignant tumours can occur in the same age group, so a single X-ray often answers the initial question when symptoms persist. If the child's pain has another orthopaedic cause, assessment continues within paediatric orthopaedics.

The first step is examination: pain duration and behaviour at night, the size and consistency of swelling, joint movement and general condition are assessed together. X-ray is usually the first imaging test; it shows the lesion's boundaries, whether it destroys bone and the surrounding reaction. These findings often strongly suggest whether the lesion is 'quiet' or 'active'.

When needed, MRI assesses soft-tissue extension and marrow involvement, CT assesses bone thinning and fracture risk, and bone scintigraphy examines other bones. Blood tests do not establish the diagnosis alone; they assess general health and assist differential diagnosis.

A definitive diagnosis is usually established by biopsy. How it is performed, the differences between closed (needle) and open methods, and why the biopsy route is chosen according to the surgical plan are explained in the biopsy section. The key rule is that a suspicious bone lesion should not be removed before diagnosis and planning.

Treatment depends on the lesion type and its effects. There are four approaches:

• Monitoring: periodic imaging and examination for symptom-free, non-growing lesions with benign features.
• Curettage and filling: removing the lesion from within bone and filling the cavity with a graft or bone cement, with plates and screws if needed.
• Wide resection and reconstruction: removal of a malignant tumour with a margin of healthy tissue, reconstructing bone loss with an implant or graft.
• Team-based treatment: planning chemotherapy and/or radiotherapy alongside surgery with medical and radiation oncology teams.

Recovery varies with the procedure. After curettage and filling, bone takes weeks or months to regain strength; weight-bearing is increased gradually and periodic imaging monitors filling of the cavity. Recovery is longer after wide excision and reconstruction, with an accompanying physiotherapy programme.

Follow-up is not only for patients who have surgery. Lesions managed by observation also need review at intervals to identify changes promptly. After treatment for a malignant tumour, the team determines the follow-up programme, which may continue for years. Increasing pain, new swelling or loss of function between reviews should prompt assessment without waiting for the scheduled appointment.

For a lesion weakening bone, following the doctor's loading restrictions is essential; jumping, heavy lifting and contact sports may increase fracture risk. Improving balance and reducing falls through home modifications and suitable shoes are simple, effective precautions. Stopping smoking supports bone healing.

Massage, heat or herbal mixtures applied over a mass do not shrink the lesion and may delay identification of the actual cause of swelling. Rather than trying self-treatment methods found online, the appropriate step is assessment with your existing scans. You can book by telephone or WhatsApp for examination, imaging planning and, when needed, coordination of biopsy and treatment at AC CLINIC in Altınordu, Ordu.