Calvarial Lesions
  • Home
  • Introductory Pages
    • Purpose of the Module
      • Introduction to Calvarial Pathology
        • Anatomy of the Calvaria
          • Imaging Principles of the Calvaria>
            • Dural Enhancement
            • History of the Calvaria
              • Welcome
              • The Lesions
                • Eosinophilic granuloma>
                  • EG Clinical Aspects
                    • EG Radiologic Aspects
                      • EG Radiologic Aspects - In Brief
                        • EG Case 1
                          • EG Case 2
                            • EG Case 3
                            • Epidermoid and Dermoid>
                              • Epi Clinical Aspects
                                • Epi Radiologic Aspects
                                  • Epi Radiologic Aspects - In Brief
                                    • Epi Case 1
                                      • Epi Case 2
                                      • Hemangioma>
                                        • Hg Clinical Aspects
                                          • Hg Radiologic Aspects
                                            • Hg Radiologic Aspects - In Brief
                                              • Hg Case 1
                                                • Hg Case 2
                                                  • Hg Case 3
                                                  • Meningioma>
                                                    • Men Clinical Aspects
                                                      • Men Radiologic Aspects
                                                        • Men Radiologic Aspects - In Brief
                                                          • Men Case 1
                                                            • Men Case 2
                                                              • Men Case 3
                                                              • Hemangiopericytoma>
                                                                • Hp Clinical Aspects
                                                                  • Hp Radiologic Aspects
                                                                    • Hp Radiologic Aspects - In Brief
                                                                      • Hp Case 1
                                                                      • Fibrous Dysplasia>
                                                                        • FD Clinical Aspects
                                                                          • FD Radiologic Aspects
                                                                            • FD Radiologic Aspects - In Brief
                                                                              • FD Case 1
                                                                                • FD Case 2
                                                                                  • FD Case 3
                                                                                  • Ossifying Fibroma>
                                                                                    • OF Clinical Aspects
                                                                                      • OF Radiologic Aspects
                                                                                        • OF Radiologic Aspects - In Brief
                                                                                          • OF Case 1
                                                                                          • Metastasis>
                                                                                            • Mt Clinical Aspects
                                                                                              • Mt Radiologic Aspects
                                                                                                • Mt Radiologic Aspects - In Brief
                                                                                                  • Mt Case 1
                                                                                                    • Mt Case 2
                                                                                                      • Mt Case 3
                                                                                                        • Mt Case 4
                                                                                                        • Multiple Myeloma>
                                                                                                          • MM Clinical Aspects
                                                                                                            • MM Radiologic Aspects
                                                                                                              • MM Radiologic Aspects - In Brief
                                                                                                                • MM Case 1
                                                                                                                  • MM Case 2
                                                                                                                    • MM Case 3
                                                                                                                    • Skin Carcinomas>
                                                                                                                      • SC Clinical Aspects
                                                                                                                        • SC Radiologic Aspects
                                                                                                                          • SC Radiologic Aspects - In Brief
                                                                                                                            • SC Case 1
                                                                                                                              • SC Case 2
                                                                                                                              • Osteoma>
                                                                                                                                • Os Clinical Aspects
                                                                                                                                  • Os Radiologic Aspects
                                                                                                                                    • Os Radiologic Aspects - In Brief
                                                                                                                                      • Os Case 1
                                                                                                                                        • Os Case 2
                                                                                                                                          • Os Case 3
                                                                                                                                          • Osteosarcoma>
                                                                                                                                            • O Clinical Aspects
                                                                                                                                              • O Radiologic Aspects
                                                                                                                                                • O Radiologic Aspects - In Brief
                                                                                                                                                  • O Case 1
                                                                                                                                                  • Paget's Disease>
                                                                                                                                                    • P Clinical Aspects
                                                                                                                                                      • P Radiologic Aspects
                                                                                                                                                        • P Radiologic Aspects - In Brief
                                                                                                                                                          • P Case 1
                                                                                                                                                            • P Case 2
                                                                                                                                                              • P Case 3
                                                                                                                                                            • Self-Assessments
                                                                                                                                                              • Quiz 1
                                                                                                                                                                • Quiz 2
                                                                                                                                                                  • Quiz 3
                                                                                                                                                                    • Unknown Case 1>
                                                                                                                                                                      • Unknown Case 1 - Answer
                                                                                                                                                                      • Unnkown Case 2>
                                                                                                                                                                        • Unknown Case 2 - Answer
                                                                                                                                                                        • Unknown Case 3>
                                                                                                                                                                          • Unknown Case 3 - Answer
                                                                                                                                                                          • Unknown Case 4>
                                                                                                                                                                            • Unknown Case 4
                                                                                                                                                                          • About
                                                                                                                                                                            • Contact
                                                                                                                                                                              • Acknowledgements>
                                                                                                                                                                                • Case 1>
                                                                                                                                                                                  • Clinical Aspects
                                                                                                                                                                                    • Radiologic Aspects - In Brief
                                                                                                                                                                                      • Radiologic Aspects
                                                                                                                                                                                        • Case 1
                                                                                                                                                                                          • Case 1

                                                                                                                                                                                      Radiologic Aspects


                                                                                                                                                                                      CT typically shows a round or smoothly lobulated mass that appears hyperdense to brain parenchyma in 75% of cases and isodense in the rest. Focal, diffuse, rim-like or punctate calcification is seen in 20% of cases. Contrast enhanced CT generally shows intense, uniform enhancement but 10-15% of cases show an atypical pattern.

                                                                                                                                                                                      On T1WI, it is usually hypo-isointense while on T2WI, it is usually iso-hyperintense, and sometimes heterogeneous. It enhances homogeneously and often exhibits a dural tail. Enhanced MR images are particularly adept at detecting small meningiomas that appear isointense on other MR images. The dural tail sign, which describes peritumoral-enhanced dura, is suggestive of, but not specific to, menigniomas. Intraosseous meningiomas usually extend through the cortical tables into the adjacent soft tissues.

                                                                                                                                                                                      The intraosseous meningioma is often radiologically indistinguishable from the plaque variety because by the time of presentation, the dura is already infitrated and as such, the true origins of the tumor cannot be stated with certainty. Normal 0 Nonetheless, prominent hyperostosis and minimal intracranial presence are more suggestive of the intraosseous sort while associated edema is more suggestive of the plaque variety.