An intraosseous hemangioma is a benign vascular growth that forms inside bone, made up of abnormal blood vessels that expand slowly within the marrow space. Most are discovered by accident on imaging done for something else entirely, particularly in the spine, where they show up on roughly one in ten MRI or autopsy studies. Despite being classified as tumors, the vast majority never cause symptoms and never need treatment. The small fraction that do become symptomatic, however, can produce pain, fractures, or even nerve compression, and those cases demand careful imaging workup and sometimes aggressive intervention.
Where They Form and Who Gets Them
The spine is by far the most common location. Vertebral hemangiomas appear predominantly in the thoracic spine, followed by the lumbar region, and about a third of people who have one actually have them at multiple spinal levels.1PubMed Central. Aggressive Vertebral Hemangioma Causing Spinal Cord Compression: Presenting a Study of Two Cases and Review of Literature The skull is the next most frequent site, with the frontal and parietal bones of the calvarium accounting for the majority of cranial cases.2PubMed. Primary Intraosseous Cavernous Hemangioma of the Cranium: A Systematic Review of the Literature They also turn up in the facial skeleton, the orbit, and occasionally the long bones of the arms and legs, though those locations are considerably rarer.
In the cranium, a systematic review found a mean age at presentation of about 33 years, with women affected roughly 1.4 times as often as men.3PubMed. Primary Intraosseous Cavernous Hemangioma of the Cranium: A Systematic Review of the Literature Vertebral hemangiomas follow a similar pattern, commonly identified in middle-aged adults. When these growths appear in children, the consequences can be more complex. One case report described an intraosseous hemangioma in the proximal femur of an eight-year-old boy that disrupted the growth plate, causing a limb deformity that required long-term monitoring and a shoe lift to compensate for leg-length discrepancy.4Journal of Orthopaedic Case Reports. Juxtaphyseal Intraosseous Hemangioma of Proximal Femur causing coxa vara and coxa breva deformity in a growing child: a Case Report
Hemangioma or Vascular Malformation
The name “hemangioma” is somewhat misleading, and the classification remains a point of genuine confusion in the medical literature. True hemangiomas are tumors characterized by actively proliferating endothelial cells. But when researchers have stained intraosseous lesions for a proliferation marker called Ki-67, they find the endothelial cells lining the abnormal vessels are not proliferating at all. Those findings point more toward a vascular malformation than a true tumor.5PubMed. Hereditary intraosseous vascular malformation of the craniofacial region: an apparently novel disorder The traditional name persists in clinical practice and on radiology reports anyway, which can create some ambiguity when patients look up their diagnosis.
The pathologic vessels in these lesions also lack normal supportive tissue around them, such as smooth muscle cells and pericytes, a feature shared with other types of vascular anomaly.6PubMed. Hereditary intraosseous vascular malformation of the craniofacial region: an apparently novel disorder This structural deficiency helps explain why aggressive forms can expand, erode bone, and bleed during surgery.
What They Look Like Under the Microscope
Histologically, intraosseous hemangiomas divide into two main subtypes. The cavernous type consists of large, thin-walled blood-filled spaces lined by a single layer of cells, while the capillary type is made of much finer, smaller vessels. Nearly all intraosseous hemangiomas of the facial skeleton are the cavernous variety.7PubMed Central. Intraosseous Cavernous Hemangioma: A Rare Presentation in Maxilla In the orbit, a review found that about 80% were cavernous, 17% capillary, and 3% mixed, with the capillary subtype linked to more aggressive behavior.8Ophthalmic Plastic & Reconstructive Surgery. Primary Orbital Intraosseous Hemangioma The distinction matters because it can inform how closely the lesion needs follow-up.
A Genetic Thread
Most intraosseous hemangiomas appear to be sporadic, meaning they show up without a family history. But a rare hereditary form has been linked to a loss-of-function mutation in the ELMO-2 gene on chromosome 20. This mutation disrupts a signaling pathway that controls how blood vessels develop in bone formed from membrane (as opposed to cartilage), leading to abnormally enlarged vessels within the skull and face.9Annals of Plastic Surgery. Clinical and Molecular Study of ELMO-2–Related Massive Intraosseous Vascular Malformations: Lessons Learned From 25 Years of Follow-up Genetic testing has also ruled out connections to several other known vascular anomaly syndromes, including hereditary hemorrhagic telangiectasia and cerebral cavernous malformations.10PubMed. Hereditary intraosseous vascular malformation of the craniofacial region: an apparently novel disorder These hereditary cases are exceptionally uncommon but can produce massive lesions that require decades of management.
How Most People Find Out They Have One
The typical vertebral hemangioma is discovered incidentally when someone gets a CT scan or MRI for back pain, an injury, or cancer screening. These asymptomatic lesions are so common that radiologists usually note them without recommending any follow-up at all. A calvarial hemangioma may present as a painless bump on the skull that has been slowly growing for months or years, often prompting imaging for cosmetic reasons or mild headache.11PubMed Central. Calvarial hemangiomas: Series of 6 cases and review of literature
The rare aggressive vertebral hemangioma is a different story. These can expand beyond the vertebral body into the spinal canal, compressing the spinal cord or nerve roots and causing weakness, numbness, or even paralysis. Such cases occur predominantly in the thoracic spine and represent only about 1% of all vertebral hemangiomas.12PubMed Central. Aggressive Vertebral Hemangioma Causing Spinal Cord Compression: Presenting a Study of Two Cases and Review of Literature Symptoms from nerve compression can include myelopathy and radiculopathy.13PubMed Central. Vertebral hemangiomas: a review on diagnosis and management
In the orbit, intraosseous hemangiomas commonly produce swelling around the eye, forward displacement of the eyeball, pain, and a visible shift in the globe’s position.14PubMed. Orbital intraosseous hemangioma; report of three cases and systematic review In long tubular bones like the femur or tibia, the presentation varies widely. Some patients report localized pain; others present after a fracture through the weakened bone. Among 16 long bone hemangiomas studied in one series, four had associated fractures.15PubMed. Hemangioma of long tubular bone: imaging characteristics with emphasis on magnetic resonance imaging
What Imaging Reveals
Intraosseous hemangiomas have some of the most recognizable patterns in radiology, at least in their classic forms. In the spine, the hallmark on CT is a “polka-dot” pattern in the axial plane, created by vertically oriented bony trabeculae seen in cross-section, surrounded by fat and vascular tissue. The same trabeculae produce a “corduroy” stripe pattern when viewed from the side.16PubMed. Imaging intraosseous hemangiomas: Typical and atypical features across modalities These fat-rich lesions tend to light up brightly on both T1- and T2-weighted MRI sequences, making them easy to identify and usually easy to dismiss as benign.
In the skull, the classic “sunburst” or “wagon-wheel” pattern of radiating trabeculae on CT is well described, though not every calvarial hemangioma follows the textbook. Some present as simple lytic or even sclerotic masses that can look worrying on first glance.17PubMed Central. Calvarial hemangiomas: Series of 6 cases and review of literature
Outside the spine and skull, the imaging picture becomes considerably less predictable. A study of hemangiomas in non-typical locations found that all showed heterogeneous MRI signal with moderate or avid contrast enhancement. Intralesional fat was detected on about 78% of MRIs but only 24% of CTs, meaning a CT alone could miss an important diagnostic clue. A soft tissue component was present on over half of MRIs.18PubMed. Imaging features of intraosseous hemangiomas: beyond the mobile spine and calvarium In long tubular bones, the radiographic appearance can range from cyst-like lesions to honeycomb patterns to cortical thickening, and some lesions that were confusing on plain radiographs became identifiable only on MRI.19PubMed. Hemangioma of long tubular bone: imaging characteristics with emphasis on magnetic resonance imaging In a separate case series of tubular bone hemangiomas, 60% were purely lytic, 30% had a soap-bubble appearance, and one was heavily calcified, showing that these lesions do not always follow a single imaging recipe.20PubMed Central. Imaging characteristics and clinical management of intraosseous hemangioma in tubular bones: a retrospective case series
Telling Aggressive Lesions from Harmless Ones
For vertebral hemangiomas, the single most useful imaging feature for predicting behavior is fat content. A classic study demonstrated that all asymptomatic vertebral hemangiomas in their series showed fatty marrow on CT and bright signal on MRI. Every single one of the compressive hemangiomas, by contrast, had soft-tissue density on CT rather than fat, and most appeared dark on T1 MRI.21PubMed. Vertebral hemangiomas: fat content as a sign of aggressiveness The interpretation is that fat-rich hemangiomas are essentially inactive, while those replaced by vascular soft tissue are the ones with the blood supply and growth potential to cause trouble.
In a series of aggressive spinal hemangiomas, imaging showed that the majority had expanded beyond the vertebral body and extended into the epidural space, with some also reaching into the surrounding soft tissues or through the neural foramina. On CT, most showed accentuated trabeculae, but a minority showed lysis instead of the expected trabecular pattern. On MRI, all were bright on T2, yet T1 signal was split: some were bright (suggesting retained fat) and some were dark (suggesting active vascular tissue).22PubMed Central. Aggressive spinal haemangiomas: imaging correlates to clinical presentation with analysis of treatment algorithm and clinical outcomes The takeaway for clinicians is that a vertebral hemangioma with low T1 signal, extraosseous extension, or the absence of fat on CT deserves closer attention.
When a Hemangioma Could Be Something Else
Atypical intraosseous hemangiomas can mimic more serious conditions, including metastatic cancer. This is a real clinical problem, particularly in patients who have a known cancer history and a new vertebral lesion that does not display the reassuring fatty signal. Radiological findings alone are not always sufficient to confirm the diagnosis, and in the skull, imaging appearances can be particularly misleading.23PubMed. Calvarial hemangiomas: report of two cases and review of the literature
Diffusion-weighted MRI can help sort this out. A study comparing atypical vertebral hemangiomas with malignant lesions found that the water diffusion values in hemangiomas were nearly double those in metastases, reflecting the open vascular architecture of hemangiomas versus the tightly packed cells of a tumor. Using a specific cutoff value, the technique could distinguish between the two with high accuracy.24Polish Journal of Radiology. Accuracy of diffusion-weighted imaging in discriminating atypical vertebral haemangiomas from malignant masses in patients with vertebral lesions: a cross-sectional study When imaging remains inconclusive, biopsy provides the definitive answer, though biopsying a highly vascular lesion carries its own bleeding risks and is not undertaken lightly.
Treatment Options for Symptomatic Lesions
Asymptomatic hemangiomas require no treatment. They can sit in the bone for a lifetime and never change. The decision to intervene arises when a hemangioma causes pain, threatens the structural integrity of the bone, or compresses neural structures.
Minimally Invasive Approaches
For painful vertebral hemangiomas without significant spinal cord compression, percutaneous vertebroplasty is a well-established option. This involves injecting bone cement directly into the vertebral body under image guidance, which stabilizes the bone and relieves pain. It also reduces the risk of later vertebral collapse. In high-flow lesions, doctors often embolize the feeding blood vessels first to reduce bleeding risk. Alcohol injection before cement placement has also been used to enhance the outcome.25Interdisciplinary Neurosurgery. Percutaneous vertebroplasty for the treatment of symptomatic vertebral hemangioma with long-term follow-up
A combined approach using alcohol embolization followed by vertebroplasty has shown good long-term results even in aggressive hemangiomas that have extended into the epidural space. This technique appears to work well for pain and sensory symptoms, though it is less effective at reversing motor deficits that have already set in.26PubMed. Long-term outcome of percutaneous alcohol embolization combined with percutaneous vertebroplasty in aggressive vertebral hemangiomas with epidural extension The message here is that early treatment before neurological damage becomes established tends to produce better functional outcomes.
Surgery
When an aggressive vertebral hemangioma causes acute spinal cord or nerve root compression with progressive neurological decline, open surgery becomes necessary. A typical approach combines vascular embolization to reduce intraoperative bleeding with surgical decompression of the spinal canal, vertebroplasty for stabilization, and hardware like pedicle screws to hold everything in place. One case of acute cauda equina syndrome from an aggressive hemangioma showed immediate pain relief after this staged approach and significant neurological recovery after three months of rehabilitation.27PubMed Central. Intravascular embolization with spinal decompression and vertebral shaping for acute cauda equina syndrome from aggressive vertebral hemangioma: a case report and literature review
For skull and facial hemangiomas, the preferred treatment is complete surgical excision, ideally with a margin of normal bone, followed by reconstruction. In the orbit, surgical removal with or without preoperative embolization remains the standard, with recurrence rates that are encouragingly low. A systematic review of 56 orbital cases with follow-up data found only one recurrence.28PubMed. Orbital intraosseous hemangioma; report of three cases and systematic review For midface lesions, surgeons have reported good long-term results using split calvarial bone grafts to reconstruct the defect after tumor removal, essentially replacing the removed facial bone with bone harvested from the patient’s own skull.29PubMed. Reconstruction of intraosseous hemangiomas of the midface using split calvarial bone grafts
Radiation Therapy
Radiation has a role in aggressive vertebral hemangiomas, particularly when surgery carries high risk or the lesion has not responded to other approaches. In a retrospective study of 20 patients treated with radiotherapy, 65% were symptom-free at an average follow-up of over six years, with no recurrence or malignant transformation. The remaining seven patients eventually required surgery after radiation failed to control their symptoms, and some had persistent or worsening neurological deficits.30PubMed Central. The Role of Radiotherapy and Surgery in the Management of Aggressive Vertebral Hemangioma: A Retrospective Study of 20 Patients Radiation is generally not the first-line choice when minimally invasive options are available, but it provides a useful alternative when other treatments are not feasible.
Recovery After Treatment
Recovery timelines depend heavily on what was treated and how. A patient who undergoes vertebroplasty for a painful vertebral hemangioma may feel substantially better within days. Someone who has open spinal surgery with decompression and hardware typically faces a longer road, but structured rehabilitation has been shown to meaningfully improve outcomes. A case report of a patient treated with surgery and a dedicated rehab program documented clear improvements in pain, range of motion, and muscle strength, with a home exercise program prescribed at discharge to maintain gains independently.31PubMed Central. Rapid Recuperation After Surgical Intervention and Rehabilitation in a Patient With Spinal Hemangioma: A Case Report
For calvarial or facial hemangiomas removed surgically, recovery tends to be straightforward once healing from the operation itself is complete. Bone grafts used in reconstruction can slowly remodel over months to years, and follow-up imaging is typically recommended to confirm there is no regrowth. The overall outlook for intraosseous hemangiomas, even the aggressive ones, is favorable once appropriate treatment is delivered. These are not malignant lesions and do not metastasize. The challenge lies in identifying the small minority that need intervention and choosing the right combination of tools to address them.
Intraosseous Hemangiomas in Long Bones
Though the spine and skull dominate the medical literature on this topic, hemangiomas in the long tubular bones of the limbs deserve separate mention because they behave differently and are harder to diagnose. These lesions tend to appear in the medullary cavity, and their imaging appearance is remarkably varied. In a series of 16 cases, researchers catalogued five distinct radiographic patterns, from cyst-like and honeycomb-like to sclerotic and cortical subtypes.32PubMed. Hemangioma of long tubular bone: imaging characteristics with emphasis on magnetic resonance imaging That variability means long bone hemangiomas are often not suspected before biopsy, and they can be mistaken for more worrisome conditions like a bone cyst, giant cell tumor, or even a primary bone malignancy.
MRI is particularly helpful in these cases. All long bone hemangiomas in the series showed high signal on T2-weighted imaging, reflecting their fluid-filled vascular spaces, and intermediate signal on T1. Cortical destruction was present in some intramedullary lesions, and a couple had caused pathological fractures.33PubMed Central. Imaging characteristics and clinical management of intraosseous hemangioma in tubular bones: a retrospective case series When these lesions sit near a joint or growth plate in a child, the consequences can extend beyond pain. In the pediatric case described earlier, the hemangioma’s involvement of the growth plate caused a progressive angular deformity that needed to be managed conservatively with monitoring and supportive measures over multiple years.34Journal of Orthopaedic Case Reports. Juxtaphyseal Intraosseous Hemangioma of Proximal Femur causing coxa vara and coxa breva deformity in a growing child: a Case Report These rare presentations remind clinicians that intraosseous hemangioma should remain on the list of possible diagnoses even in unexpected anatomical locations and age groups.