Brachydactyly type B (BDB) is a very rare congenital malformation characterized by hypoplasia or aplasia of the terminal parts of fingers 2 to 5, with complete absence of the fingernails.

Stapes ankylosis refers to congenital or acquired fixation of the stapes (the stirrup-shaped small bone or ossicle in the middle ear), which is associated with conductive hearing resulting from impairment of the sound-conduction mechanism (the external auditory canal, tympanic membrane, and/or middle-ear ossicles).