fibrosis of extraocular muscles, congenital, 3A, with or without extraocular involvement (MONDO_0010912) is any congenital fibrosis of extraocular muscles in which the cause of the disease is a mutation in the TUBB3 gene. Also known as: TUBB3 congenital fibrosis of extraocular muscles, congenital fibrosis of extraocular muscles caused by mutation in TUBB3, fibrosis of extraocular muscles, congenital, 3A.