Related Experiment Video
Updated: Aug 19, 2026
Endaural Endoscopic Atticoantrotomy (Retrograde Mastoidectomy) using a Constant Suction Bone-drilling Technique
Published on: May 23, 2021
[Latent, non-suppurative mastoiditis. Apropos of 62 cases]
1Service d'ORL et de Chirurgie Cervico-Faciale, Hôpital Soroka, Université Ben-Gourion, Beer-Sheva, Israël.
Abstract:
The term masked mastoiditis defines a subclinical infectious inflammatory process of the mucosal lining and bony structures of the mastoid air cells with an intact tympanic membrane. The disease follows an apparently well treated recent acute otitis media. Probably due to an anaerobic colonizing flora, the developing bone infection is of low grade without pus formation. The clinical features of the disease are not overt as those in coalescent mastoiditis. The intact ear drum does not reflect the severity of bone eroding disease which is characterized by non-exudative but proliferative changes. Hence there is no pus formation. The incidence of complications is high. Plain X-ray film and CT scan do not specifically define the disease process. Bone scan indicates the bone invading nature of the mastoid infection. The osteoblastic reaction secondary to osteitis is demonstrated by the high uptake of the isotope in the involved mastoid. Antibiotics may cure the disease process but in most of the cases surgery in unavoidable.
Insights
Masked mastoiditis is a subclinical infection following acute otitis media, characterized by bone erosion without pus. Diagnosis is challenging, often requiring bone scans, and surgery is frequently necessary.
Area of Science:
- Otolaryngology
- Infectious Diseases
- Radiology
Background:
- Masked mastoiditis is a subclinical infectious inflammatory process affecting the mastoid air cells.
- It occurs after seemingly well-treated acute otitis media, often involving anaerobic bacteria.
- This low-grade bone infection lacks pus formation and presents with subtle clinical signs.
Purpose of the Study:
- To define masked mastoiditis, a challenging diagnosis.
- To highlight the diagnostic utility of bone scans in identifying this condition.
- To discuss treatment implications, including the frequent need for surgery.
Main Methods:
- Review of clinical presentations and diagnostic imaging findings in masked mastoiditis.
- Emphasis on the limitations of plain X-ray and CT scans.
- Highlighting the role of bone scintigraphy in detecting osteitis and bone invasion.
Main Results:
- Masked mastoiditis presents with an intact tympanic membrane, masking the underlying bone-eroding disease.
- Non-exudative, proliferative changes characterize the bone infection, leading to a high incidence of complications.
- Bone scans show high isotope uptake, indicating osteoblastic reaction secondary to osteitis.
Conclusions:
- Masked mastoiditis is a distinct entity often missed by conventional imaging.
- Bone scintigraphy is crucial for diagnosing the extent of bone involvement.
- While antibiotics may be used, surgical intervention is often required for definitive treatment.
Related Concept Videos
01:22Bacterial Meningitis I: Introduction
01:26Bacterial Meningitis II: Pathophysiology
01:26Brain Abscess l: Introduction