Secondary angiosarcoma of the bone
Unlike primary forms, secondary angiosarcoma (Secondary angiosarcoma) has a clearly traceable link to prior pathological conditions or medical interventions.
The main predispositions are:
- Radiotherapy (radiotherapy) previously administered for other conditions.
- Bone infarction (bone infarction), leading to ischemic necrosis of areas of the bone marrow and cancellous bone with subsequent malignant transformation.
Adamantinoma of the long tubular bones
Since angiosarcoma is often considered within the differential diagnosis of rare tumors, it is important to mention adamantinoma (Adamantinoma). This is an extremely rare, locally aggressive tumor accounting for less than 0.5% of all primary malignant bone neoplasms.
Clinical and epidemiological profile:
- Age: from 10 to 50 years (average — 35 years).
- Gender: males predominate in the general population, whereas among young patients, the incidence is higher in females.
- Symptomatology: local pain and tenderness upon palpation (tenderness), which may persist from several months to several years.
- Histology: the tumor resembles maxillofacial ameloblastoma (ameloblastoma), but they are genetically and pathogenetically unrelated.
Predilection site: The tibia (tibia) is affected in 90% of cases. The tumor is most commonly located in the middle third of the diaphysis (mid-diaphysis), but may extend toward the metadiaphysis. In 10% of cases, multifocal involvement is observed, involving the ipsilateral fibula (fibula).
Diagnostic imaging of adamantinoma and differential diagnosis
Diagnostics are based on a combination of radiological and magnetic resonance data.
Radiography: The typical picture includes multiple eccentric areas of lucency (lucencies) interspersed with sclerosis (interspersed sclerosis). The process typically originates from the anterior cortex of the tibia.
MRI:
- Bone marrow involvement (marrow extension) is detected in 60% of cases.
- Extra-osseous extension (extra-osseous extension) and multifocality occur in 30% of cases.
Differential diagnosis: The main differential diagnosis is made with osteofibrous dysplasia (OFD) and OFD-like adamantinoma. OFD also affects the anterior tibial diaphysis. Factors favoring true adamantinoma include:
- Complete bone marrow involvement.
- Extension beyond the cortical margin.
- Poorly demarcated margins (poorly demarcated margins).
Note: Due to significant overlap of imaging features (overlap), two theories of pathogenesis exist. The first suggests that OFD is a precursor to adamantinoma (which is not confirmed by longitudinal studies). The second is that they represent the benign and malignant poles of a single disease.
Other tumors: Ewing sarcoma and Chordoma
Within the framework of radiological evaluation of skeletal malignant lesions, specific patterns for other sarcomas are also distinguished.
- Ewing sarcoma (Ewing sarcoma):
To assess response to polychemotherapy (e.g., after three cycles), it is optimal to use coronal whole-body MRI in STIR mode (Short tau inversion recovery). This mode reliably visualizes bone metastases and confirms a complete response to treatment (complete response).
- Chordoma (Chordoma):
- Pelvic radiography: allows suspecting pathology in the anteroposterior projection.
- CT (axial slices): visualizes a destructive midline mass lesion (midline mass lesion), characteristic calcification, and a presacral soft-tissue component.
- MRI (T2-weighted with fat suppression): demonstrates typical lobular hyperintensity (lobular T2 weighted hyperintensity), which is a hallmark of midline tumors.
Briefly: answers to topical questions
What are the typical radiological features of primary bone angiosarcoma on radiography and MRI?
On radiographs, multifocal angiosarcoma manifests as multiple lytic lesions that may be limited to a single limb. Specific MRI features of primary bone angiosarcoma are not described in the provided materials. Without a biopsy, these radiological findings are indistinguishable from the following pathologies:
- Metastatic disease — secondary bone involvement.
- Multiple myeloma (myeloma) — a malignant plasma cell disorder.
With which benign and malignant bone tumors, besides osteofibrous dysplasia, must adamantinoma be differentiated?
In addition to osteofibrous dysplasia, adamantinoma must be differentiated from osteofibrous dysplasia-like adamantinoma (osteofibrous dysplasia–like adamantinoma). Based on imaging methods, these conditions cannot be reliably distinguished from each other; a biopsy is mandatory for definitive diagnosis verification.
To remember the localization of adamantinoma: "Adamantinoma Attacks Antonym" — the anterior surface (antonym/front) of the tibia in 90% of cases.
Class and exam questions
What causes secondary angiosarcoma of the bone to develop?
It may arise as a delayed consequence of prior radiotherapy or bone infarction.
How to differentiate adamantinoma from osteofibrous dysplasia (OFD) on MRI?
Factors favoring adamantinoma include complete bone marrow involvement, extracortical extension, and poorly demarcated lesion margins.
Which MRI sequence is best to use for evaluating Ewing sarcoma treatment response?
It is recommended to use coronal whole-body STIR MRI (fat-suppressed) to evaluate bone metastases.
Where is chordoma most commonly located and what does it look like on CT?
Chordoma is located in the midline. On CT, it is a destructive mass lesion with calcification and a presacral soft-tissue component.
What else to study on this topic
- Pathogenetic link between bone infarction and the development of secondary angiosarcoma.
- OFD-like adamantinoma as a separate nosological entity.
- Principles of using STIR mode in musculoskeletal oncology.
- Histological differences between bone adamantinoma and maxillofacial ameloblastoma.
- Multifocal lesions of the lower leg bones in sarcomas.
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