However, it is difficult for antibiotics to penetrate to the interior of the mastoid process and so it may not be easy to cure the infection; it also may recur. Mastoiditis has many possible complications, all connected to the infection spreading to surrounding structures. Hearing loss is likely, or inflammation of the labyrinth of the inner ear (labyrinthitis) may occur, producing vertigo and an ear ringing may develop along with the hearing loss, making it more difficult to communicate. The infection may also spread to the facial nerve (cranial nerve VII), causing facial-nerve palsy, producing weakness or paralysis of some muscles of facial expression, on the same side of the face. Other complications include Bezolds abscess, an abscess (a collection of pus surrounded by inflamed tissue) behind the sternocleidomastoid muscle in the neck, or a subperiosteal abscess, between the periosteum and mastoid bone (resulting in the typical appearance of a protruding ear). Serious complications result if the infection spreads to the brain. These include meningitis (inflammation of the protective membranes surrounding the brain), epidural abscess (abscess between the skull and outer membrane of the brain), dural venous thrombophlebitis (inflammation of the venous structures of the brain), or brain abscess. Epidemiology
In the United States and other developed countries, the incidence of mastoiditis is quite low, around 0.004%, although it is higher in developing countries. The condition most commonly affects children aged from two to thirteen months, when ear infections most commonly occur. Males and females are equally affected.
Out may refer to:

Arts, entertainment, and media
Films
Out (1957 film), a documentary short about the Hungarian Revolution of 1956
Out (1982 film), an American film directed by Eli Hollander
Out (2002 film), a Japanese film based on the novel by Natsuo Kirino and directed by Hideyuki Hirayama
Out (2013 film), a Canadian short comedy film directed by Jeremy LaLonde
Out (2017 film), a Slovak film directed by György Kristóf
Out (2020 film), an American animated film produced by Pixar

Music
Out (jazz) or outside, an approach to jazz improvisation
OUT, a band produced by Adam Walton
OUT, a 1994 album by Nav Katze
Out (In Essence), a 1991 album by Fluke

Television
Out (miniseries), a 1978 British television crime drama starring Tom Bell
"Out" (Dark Angel), a television episode

Other uses in arts, entertainment, and media
Out (magazine), an LGBT fashion, entertainment, and lifestyle magazine
Out (novel), a 1997 novel by Natsuo Kirino
OUTeverywhere, a community website for LGBT people around the world

Sports and recreation
Out (baseball), a play which retires the batter or a base runner
Out (cricket), the loss of a wicket by a batsman; also known as "dismissal"
Out (poker), an unseen card which is expected to win a hand, if drawn
Out (route), a pattern run by a receiver in American football

Sexuality
Coming out, publicly revealing ones own LGBT status
Outing, publicly revealing someone elses LGBT status

Mathematics
Out(Fn), the outer automorphism group of a free group on n generators
Outer automorphism group, a quotient Out(G) of the automorphism group

Transport
Outwood railway station, West Yorkshire, National Rail station code

Other uses
Out, a procedure word in voice radio communication

See also
Outing (disambiguation)
Outside (disambiguation)
All pages with titles containing Out
All pages with titles beginning with Out