Foramen Magnum Mass


DIFFERENTIAL DIAGNOSIS

Common

  • Acquired Tonsillar Herniation

  • Chiari 1 Malformation

  • Chiari 2 Malformation

  • Meningioma, Clivus

  • Rheumatoid Arthritis, Adult

  • Schwannoma, Jugular Foramen

Less Common

  • Chordoma, Clivus

  • Ependymoma

  • Chondrosarcoma, Skull Base

  • Retroodontoid Pseudopannus

  • Hemangioblastoma

  • Calcium Pyrophosphate Dihydrate Deposition Disease (CPPD)

  • Metastasis, Skull Base

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