Ecchordosis physaliphora is a rare congenital, benign, hamartomatous, retroclival mass derived from notochordal tissue that is typically located intradurally in the prepontine cistern. Ecchordosis physaliphora is usually asymptomatic. The differential diagnosis of EP also includes chordoma, dermoid, epidermoid, arachnoid cysts and partially thrombosed vertebrobasilar aneurysm. When a retroclival mass is established on MRI, any associated osseous stalk should be evaluated on thin-section CT as in our case which is classical for the diagnosis of Ecchordosis Physaliphora. This is 29 year old male with prepontine and retroclival lesion on MRI with no significant enhancement and diffusion restriction.
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