Calvarial hemangiomas: report of two cases and review of the literature.
BACKGROUND
Primary hemangiomas of the bone are uncommon tumors, accounting for less than 1.0% of all bone neoplasms. These tumors are mostly found in vertebral bodies. Hemangiomas are rarely seen in the calvarium, where their frequency is 0.2% of all bone neoplasms. Because of their infrequent appearance in the skull, vague symptoms, and absence of prototypical radiological findings, these tumors can be missed in many cases or may be misinterpreted as more ominous lesions like multiple myeloma or osteosarcoma.


METHODS
We report two cases of calvarial hemangiomas: one with a single mass on the right sphenoid wing, and another with two similar lesions on the right occipital and left parietal bones. The diagnoses could be established only by histopathologic analysis.


CONCLUSIONS
Histopathologic confirmation of the tumor is the definitive method for diagnosis of intraosseous hemangiomas. Radiological findings are not always characteristic for calvarial hemangiomas. Due to possible complications and the possibility of effective treatment, this lesion should always be considered in the differential diagnosis of skull lesions.
University of Virginia Health Sciences Center, Department of Pathology, Box 800-214, Charlottesville, VA 22908-0214, USA.
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Khanam
M H
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Lipper
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CL
Wolff
M B
MB
Lopes
D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006391:Hemangioma / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D018324:Hemangioma, Capillary / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D006392:Hemangioma, Cavernous / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D012886:Skull / Q000473:pathology / Q000601:surgery*; D012888:Skull Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D014057:Tomography, X-Ray Computed