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Objective To approach the clinical and pathologic features of BMALL.Method To analyse retrospectively the clinical data of these 3 BMALL cases.Result The 3 patients were all male and chronic onset,mainly including amyotrophy of one lower limb.3 cases were all normal with serum enzyme.2 of the EMG showed neurogenic damage while the other 1 was normal.The iconography of lumbar intervertebral disk between L3 with L4,L4 with L5 were all slightly hernia.Muscle pathologic all showed inequality of size in muscle fibers and little keratosic fibers.2 cases were minimum fiber,2 cases with nuclear ingression myofibers.1 case was with myofiber type grouping.Conclusion The clinical feature of BMALL mainly amyotrophy of one lower limb.Pathological study shows neurogenic damage,including little keratosic myofibers,nuclear ingression myofiber and myofiber type grouping etc.