What infection is caused by an untreated middle ear infection that spreads to the bone behind the ear?

• A. Sinusitis
• B. Mastoiditis
• C. Otitis media
• D. Labyrinthitis

Answer: (B)

Mastoiditis is the infection that arises when a middle ear infection, commonly known as otitis media, is left untreated and spreads to the mastoid bone, which is located behind the ear. This condition can lead to serious complications, as the mastoid bone contains air cells that, when infected, can lead to swelling, pain, and possible further complications if not properly treated.

The connection between otitis media and mastoiditis makes mastoiditis a direct consequence of untreated infections in the middle ear. Symptoms of mastoiditis can include redness and swelling behind the ear, fever, and discharge from the ear. Early recognition and treatment are crucial to prevent further complications that may arise from the infection spreading.

In contrast, sinusitis refers to the inflammation of the sinuses and is not directly related to the ear. Otitis media, while related, describes the initial condition that can lead to mastoiditis rather than the complication itself. Labyrinthitis is an inner ear infection that affects balance and hearing but does not pertain to the spread of infection to the mastoid bone. Thus, mastoiditis is the correct answer as it precisely describes the infection resulting from untreated middle ear infections spreading.