biology

Mastoidectomy

Mastoidectomy is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Mastoidectomy rather than just read about it. In short: A mastoidectomy is a procedure performed to remove the mastoid air cells near the middle ear. The procedure is part of the treatment for mastoiditis, chronic suppurative otitis media or cholesteatoma.

Key takeaways

Mastoidectomy belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mastoidectomy to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mastoidectomy from memory before moving on to harder problems.

Reference excerpt

A mastoidectomy is a procedure performed to remove the mastoid air cells near the middle ear. The procedure is part of the treatment for mastoiditis, chronic suppurative otitis media or cholesteatoma. Additionally, it is sometimes performed as part of other procedures, such as cochlear implants, or to access the middle ear.

Usages Historically, trephination was used to potentially relieve intracranial pressures or build-up of pus, with records dating back to pre-historic times. Over time, these became formalized as mastoidectomies. Mastoidectomies were used to treat infections such as otitis media, or abnormal skin cell growth near the middle ear. Over time, they were adapted to help treat hearing issues such as tinnitus. Mastoidectomies have also been used in the modern practice of placing cochlear implants. Additionally, mastoidectomies are occasionally performed with tympanoplasties to fix the tympanic membrane.

Complications The following are possible complications from mastoidectomy procedures:

Temporary or permanent hearing loss, tinnitus Facial nerve damage Dizziness or vertigo Taste changes Dural injury Cerebrospinal fluid leakage Intracranial complications such as brain abscess, subdural empyema, sigmoid sinus hemorrhage

Classifications In 2018, the International Otology Outcome Group agreed on guidelines defining different mastoidectomies. Before this, there was discourse on the proper classifications of the procedure. Under the 2018 guidelines, there are the following types of mastoidectomy:

Mx: No mastoidectomy

M1: Mastoidectomy with preserved canal wall Also known as schwartze procedure or cortical mastoidectomy or canal wall up

M1a: Mastoidectomy with preserved canal wall M1b: Mastoidectomy with preserved canal wall and posterior tympanotomy

M2: Mastoidectomy with partial or complete canal wall removal Also known as canal wall down

M2a: Mastoidectomy with only scutum removal, with tympanic membrane left intact (atticotomy) M2b: Mastoidectomy with scutum and postero-superior wall removal (attico-antrostomy) M2c: Mastoidectomy with complete canal wall removal and mastoid and middle ear exteriorization (modified radical mastoidectomy/Bondy's procedure or radical mastoidectomy)

M3: Mastoidectomy with subtotal petrosectomy Used for

M3a: Mastoidectomy with subtotal petrosectomy and otic capsule preserved M3b: Mastoidectomy with subtotal petrosectomy and otic capsule removed Additionally, there are mixed categories, such as M1a+2a and M1b+2a. There is a slight distinction between M2c and M3a in that M3a removes the eardrum before pre auricular pit and cavity closure and blocks the tympanic opening of the Eustachian tube. After the invention of endoscopic transcanal ear surgery by Muaaz Tarabichi, the usage of this procedure has decreased significantly.

History

Greek physician Galen (AD 129-217) was the first to write in his treatise Hygiene (Italian: De Sanitate Tuenda, English: On the Preservation of Health) about ear discharge being a natural secretion from the brain, and the importance of permitting drainage of such fluid.

The first potential documented case of a mastoidectomy procedure was recorded in 1524 by Lucas van Leyden as an incision behind the right ear. Abscess drainage was popularized by Adam Politzer, considered to be one of the founders of otology and initially interpreted Galen's writings on ear discharge to mean that Galen removed infected mastoid regions. However, this may have been deliberately misrepresented to justify mastoidectomy procedures to more conservative audiences.Additionally, there is controversy whether French physician Ambroise Paré was the first to describe a surgical procedure draining an infected ear of Francis II of France in 1560. Recent studies have shown how there is lack of documentation of this event by French historian Louis Régnier de la Planch, and also lack of mention in Paré's own writings. Credit for the first mastoidectomy to remove abscesses is attributed to Jean-Louis Petit in the 18th century. However soon after this, the procedure fell out of popularity in the 18th century after the death of Justus von Berger in 1791. von Berger, the court physician of Christian VII, died 13 days after a mastoidectomy attempt to fix his right-sided deafness.

The mastoidectomy was revitalized in 1873 following the publication, Ueber die künstliche Eröffnung des Warzenfortsatzes (English: “On the artificial opening of the mastoid process”), written by Hermann Schwartze and his assistant Adolf Eysell. In the publication, Schwartze made several recommendations on modernizing the procedure, including replacing older instruments and a new surgical technique. This procedure, using a chisel and gouge, is now credited as the "modern mastoid operation" or Schwartze operation. Published in the oldest and most known otolaryngology journal of the time, Archiv für Ohrenheilkunde, the publication became widely disseminated and referenced.

References

Illustrations

Worked examples

Example 1 — a first encounter with Mastoidectomy

Start with the simplest possible case. Write down what Mastoidectomy claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Mastoidectomy before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Mastoidectomy ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Mastoidectomy

In research: Mastoidectomy appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Mastoidectomy in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Mastoidectomy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diseases of the ear and mastoid process, Ear surgery, Human head and neck, so understanding it makes those chapters shorter.
In everyday life: Look for Mastoidectomy outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Mastoidectomy in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mastoidectomy means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Mastoidectomy out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mastoidectomy in simple terms?

Why does Mastoidectomy matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Mastoidectomy?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Mastoidectomy.