– arises from remnants of primitive notochord found in midline at either end of the spine (sacrum > shnooccipital region) in middle-aged men

Signs & Symptoms:
– gradual onset of pain & usu long duration prior to diagnosis
– large presacral rectal mass
– bowel or bladder dysfunction

– destructive bony lesion associated with an expansile soft tissue mass

– polyhedral cells with eosinophilic cytoplasm & many vacuoles which displace the nucleus = physaliphorous cells
– cells disposed in cords, trabeculae or sheets which are separated by abundant mucoid & myxoid matrix

– wide excision (may have to sacrifice sacral roots)
– radiation if not resectable
– frequent metastases to lungs, liver & other tissues

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