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A new classification of limb‑girdle muscular dystrophy, which was adopted in 2018, is given. The reasons why there was a need to revise the classification are indicated. A new definition of this pathology is given. The diseases that were excluded from the new classification of limb‑girdle muscular dystrophy due to inconsistency with the new definition of this form of pathology are given. A comparison of the new and old classification of this group of muscular dystrophies is given. The genes responsible for the development of various forms of this pathology are indicated, as well as proteins of striated musculature, the synthesis of which is disrupted. It has been shown that a mutation in one gene can lead to different types of inheritance of limb‑girdle muscular dystrophy, which is important to take into account when conducting prenatal diagnostics. The new classification will allow introducing new forms of this pathology as new mutations in disease genes are detected.

Guillain–Barré syndrome – an acute demyelinating autoimmune disease characterized by lesions of the peripheral nervous system and consequently peripheral paralysis, paresthesias and/or pain. Guillain–Barré syndrome is a predominant cause of acute flaccid paralysis, which may occur at any age. We present two clinical cases of flaccid paralysis with patients at the age of 7 and 5 years requiring verification of the diagnosis.

Neuromyelitis optica spectrum disorder is an inflammatory demyelinating disease of the central nervous system with selective damage to the optic nerves and spinal cord. The clinical case of a child 11 years old and its course throughout the year, with an onset in the form of an episode of visual impairment with signs of a previously developed partial atrophy of the optic nerves of both eyes and a manifestation of retrobulbar neuritis on the left eye is considered in the article. Repeatedly conducted magnetic resonance examination revealed a pattern of focal lesion of the left and then of the right optic nerve with a violation of the integrity of the blood brain barrier and an extended focus in the structure of the spinal cord of the cervical spine. The blood test for antibody to aquaporin-4 was positive. Optical coherence tomography revealed decrease in the thickness of the peripapillary fibers of the retina in all quadrants in both eyes, which indicates a partial atrophy of the optic nerves of both eyes, as a result of repeatedly transferred retrobulbar neuritis in both eyes.