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Hemispherical spondylosclerosis--a polyetiologic syndrome
Insights
Radiologic examination identified hemispherical spondylosclerosis (HSS), a vertebral condition characterized by specific sclerosis and bone changes. Further research is needed to understand the unknown factors contributing to its occurrence and predilection.
Area of Science:
- Radiology
- Orthopedic Imaging
- Spinal Pathology
Background:
- Hemispherical spondylosclerosis (HSS) is a distinct radiologic finding observed in vertebral lesions.
- Understanding HSS is crucial for differentiating various spinal pathologies.
Purpose of the Study:
- To define and describe the radiologic features of hemispherical spondylosclerosis (HSS).
- To explore the differential diagnosis of HSS, considering various etiologies.
- To highlight characteristic patterns and unknown factors associated with HSS.
Main Methods:
- Radiologic examination of 43 patients.
- Analysis of 47 identified vertebral lesions.
- Description of key radiologic findings including supradiscal sclerosis, end plate erosions, periosteal apposition, new bone formation, osteophytes, and disk space narrowing.
Main Results:
- Identified and defined hemispherical spondylosclerosis (HSS) based on characteristic radiologic findings.
- Observed HSS in the context of degenerative disk disease, bacterial spondylitis, ankylosing spondylitis, osteoid osteoma, and metastases.
- Noted predilection for thoracic spine (T4 > L5 > L3) and a higher incidence in females.
Conclusions:
- Hemispherical spondylosclerosis (HSS) is a recognizable radiologic entity with a defined set of features.
- HSS can arise from diverse etiologies, necessitating careful differential diagnosis.
- The underlying reasons for HSS's characteristic shape, location, and demographic predilection remain unknown.
Abstract:
Radiologic examination of 43 patients revealed 47 lesions of a type which we have termed hemispherical spondylosclerosis (HSS). This term describes and includes the following essential and possible radiologic findings of the disease: 1) Hemispherical (or "dome-" or "helmet-shaped") sclerosis of the vertebra above the intervertebral disk. Thus it is a supradiscal HSS. 2) One or more small erosions of the inferior end plate of the vertebra involved. 3) Periosteal apposition on the anterior border of the vertebra along the length of the sclerosis. 4) New bone formation on the inferior end plate. 5) Anterior vertebral osteophytes. 6) Narrowing of the disk space below the affected vertebra. HSS occurs not only as a sequel of degenerative disk disease, but also in bacterial (tuberculous and non-tuberculous) spondylitis, ankylosing spondylitis, osteoid osteoma, and metastases of neoplasms. The differential diagnosis between inflammatory and noninflammatory pathogenesis and etiology of HSS is described. The characteristic shape of HSS, its sites of predilection (14 greater than L5 greater than L3), and the preponderance of female sufferers from this painful condition are due to factors which, as yet, remain unknown.