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Medical Definition of Panmyelophthisis
1. 1. Wasting or atrophy of the spinal cord as in tabes dorsalis. 2. Replacement of haemopoietic tissue in the bone marrow by abnormal tissue, usually fibrous tissue or malignant tumours which are most commonly metastatic carcinomas. Synonym: panmyelophthisis. Origin: myelo-+ G. Phthisis, a wasting away (05 Mar 2000)