Case report. Ultrastructural changes of muscles during attacks of adynamia episodica hereditaria

In an ultrastructural study of biopsies of quadriceps femoris muscle from two patients during attacks of adynamia episodica hereditaria. Marked pinocytosis along the sarcolemma and an interfibrillary oedema were observed, together with a 'bamboo-like' shape of the myofibrils. Other non-specific abnormalities were also found.