HÃ¼rthle cell cancer has the highest incidence of metastasis among the differentiated thyroid cancers. Metastatic disease is reported at the time of initial diagnosis in 10-20% of patients and in 34% of the patients overall.
By Michael Perry, M.D. Foraminal narrowing, or foraminal stenosis, is a condition of the spine that can cause pain and other symptoms resulting from spinal nerve root compression. At every level of the spine, a pair of nerve roots runs through the spinal column via small openings called foramina (singular: foramen).
The foramen magnum (Latin: great hole) is a large opening in the occipital bone of the human skull. It is one of the several oval or circular openings (foramina) in the base of the skull.The spinal cord, an extension of the medulla, passes through the foramen magnum as it exits the cranial vault.he opisthion is the midpoint on the posterior margin of the foramen magnum and is a cephalometric landmark. Another landmark is the basion located at the midpoint on the anterior margin of the foramen magnum. The foramen magnum is a very important feature in bipedal mammals.