Mastoid Cholesteatoma Diagnosis and Management

Pathophysiology and Classification

A mastoid cholesteatoma is a benign but progressive cystic lesion composed of keratinized squamous epithelium that develops within the mastoid portion of the temporal bone, capable of causing extensive bone erosion and serious complications if left untreated, according to Praxis Medical Insights 1
Acquired cholesteatomas are the most common type, typically resulting from chronic otitis media with tympanic membrane perforation or retraction pockets, as stated by Praxis Medical Insights 1

Mastoid cholesteatomas can cause ossicular erosion, lateral semicircular canal erosion, facial canal dehiscence, tegmen erosion with potential intracranial extension, and scutum erosion, as reported by the Journal of the American College of Radiology 2

CT temporal bone without IV contrast is the cornerstone imaging modality for diagnosis and presurgical planning, providing excellent anatomic detail of bony structures and determining the extent of disease, according to Praxis Medical Insights 1, 3
MRI with diffusion-weighted imaging (DWI) is essential for tissue characterization, differentiating cholesteatoma from scar tissue, granulation tissue, and other soft tissue pathology with high sensitivity and specificity, as stated by Praxis Medical Insights 1

Any patient with suspected cholesteatoma should be referred to an otolaryngologist for definitive management, as surgery is the treatment of choice, according to Praxis Medical Insights 1
Preoperative HRCT combined with audiological assessment provides good estimates of ossicular erosion degree and guides surgical approach, as reported by Praxis Medical Insights 1

CT temporal bone without IV contrast is the primary modality for detecting recurrent cholesteatoma by identifying abnormal, new, or enlarging lobulated material, according to Praxis Medical Insights 1
MRI with DWI and delayed postcontrast T1-weighted imaging differentiates recurrent cholesteatoma from postoperative granulation tissue and scar, as stated by Praxis Medical Insights 1