Classification and diagnostics of bone tumors

Clinical presentation and latent course

The disease is often asymptomatic: a neoplasm can reach significant sizes without visible clinical manifestations and be discovered incidentally (e.g., after minor trauma). Primary tumors typically affect young people and children, whereas metastases are more common in older age.

Key clinical manifestations:

• Pain syndrome: is not a mandatory symptom, though "night" pain or soreness with physical exertion may occur.
• Palpation: tenderness varies. If the tumor destroys the cortical layer of the bone (which is particularly characteristic of giant cell tumor), crepitus occurs upon palpation.
• Functional limitation: with periarticular localization, the range of motion in the joint decreases, leading to a limp and muscle hypotrophy.
• Compression syndrome: localization near the spine or neurovascular bundles carries the risk of compressing the spinal cord, peripheral nerves, and blood vessels. This manifests as paresis, paralysis, and blood flow disorders.
• Specific masks: Ewing's sarcoma often mimics osteomyelitis, accompanied by hyperemia, local edema, and fever.

Instrumental and morphological diagnostics

Timely examination often allows an asymptomatic tumor to be detected for the first time as an incidental finding.

1. Radiological diagnostics. Radiography in two standard projections remains the baseline method—it shows the presence, volume, and location of the lesion. In doubtful situations, diagnostics are supplemented with CT, MRI, scintigraphy, and radiopaque methods.
2. Morphological verification. To precisely determine the nature of the neoplasm, needle or open biopsy is mandatory. The main problem here lies in the fact that, due to cellular polymorphism and transitional forms, histological results can sometimes be erroneous, which greatly complicates the choice of treatment tactics.

S. T. Zatsepin classification of bone tumors

The systematization of bone tumors is constantly changing due to the identification of new forms. The most convenient for clinicians is the working classification by S. T. Zatsepin, which divides neoplasms according to their origin into benign, transitional, and malignant forms.

Tumors of uncertain nature (e.g., benign or malignant giant cell tumor) and tumors originating from the reticular stroma of the bone marrow, which are exclusively represented by malignant forms (Ewing's sarcoma, malignant lymphoma, myeloma), are classified separately.

Principles of treatment and complication prevention

A formidable complication of the tumor process is a pathological fracture. It occurs due to significant bone destruction under normal physiological loads or minor trauma.

The leading treatment method in bone oncology is surgical intervention:

• Tumor enucleation;
• Bone resection followed by alloplastic reconstruction;
• Arthroplasty and joint/bone segment replacement.

Thanks to microsurgery and modern endoprosthetics technologies, even in malignant forms, amputation can be avoided in the vast majority of cases. In the postoperative period, based on the final morphological examination data, patients are prescribed courses of chemotherapy and radiation therapy.

Briefly: answers to topical questions

Class and exam questions

What else to study on this topic

• König's disease (partial osteochondritis dissecans of articular surfaces)
• Principles of conservative and surgical treatment of avascular necrosis
• Prevention of osteochondropathies in childhood and peak bone mass
• Management tactics for patients with pathological fractures
• Differential diagnosis of joint mice and chondromatosis

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