WHAT IS ECCHORDOSIS?

Q.All are true regarding intracranial pathology except

a. Almost all cranial chordomas are found in relation to the clivus

b. Ecchordosis refers to a nodule of benign cells of notochordal origin

c. Pituicytoma and Granular Cell Tumors  is situated anteriorly  within the gland

d. Pituicytoma and Granular Cell Tumors  are extremely vascular

 e.chordomas are  histologically benign but locally invasive and destructive

ANS.---c

The most telling feature of  Pituicytoma and Granular Cell Tumors is its the specific anatomic site .In fact, the diagnosis of Pituicytoma and Granular Cell Tumors should be suspected when the pituitary mass is situated posteriorly within the gland and the normal posterior lobe hyperintensity cannot be identified. Of course, the most common posteriorly situated pituitary tumor is still the adenoma.

Ecchordosis refers to a nodule of benign cells of notochordal origin, usually the size of a pea, that occurs in or attached to the clivus . Although related to chordoma embryologically, ecchordosis differs from chordoma in that it is not a neoplasm and has no potential for growth or dissemination