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-•- pathic or paralytic myoglobinuria and re-current rhabdomyolysis, is a rare disease, 56 cases having been reported to date in the medical literature (1, 2). It is to be differenti-ated from secondary myoglobinuria occurring following crush injuries (3), high voltage acci-dents (4), convulsions (5, 6), arterial occlusion (7), and epidemic Haff disease (8). It must also be differentiated from other disorders charac-terized by the passage of dark urine, such as the porphyrias, march hemoglobinuria, par-oxysmal cold hemoglobinuria, paroxysmal noc-turnal hemoglobinuria, and the various nephri-tides. A clinical picture similar to muscular dystrophy has been noted to occur in associa-tion with myoglobinuria (9-12), and some of these patients have exhibited myotonia (5, 10, 13); this is a functional manifestation of the disorder and is not to be confused with Thomsen's disease (14, 15). T h e following case report illustrates the clinical syndrome of primary myoglobinuria. C A S E R E P O R T A 37-year-old cab driver was admitted to the Birmingham Veterans Hospital for the second time at 7 AM, December 1, 1959, complaining of "dark urine and sore muscles." His past history was significant in that he had had "asthma " from 1927 until 1937. This recurred in 1948 and has since been intermittent. The pa-tient excelled in basketball and baseball and had Received March 20, 1961; accepted for publica