Cholesteatoma Imaging and Diagnosis

Initial Imaging Strategy

The American College of Radiology recommends CT temporal bone without IV contrast as the cornerstone imaging modality for presurgical planning when cholesteatoma is suspected, providing excellent anatomic detail of bony structures and determining the extent of disease in the middle ear and mastoid 1, 2
CT accurately detects ossicular erosion, scutum erosion, tegmen erosion, and lateral semicircular canal erosion, helping identify potential surgical hazards 1, 2
Preoperative HRCT combined with audiological assessment provides good estimates of ossicular erosion degree 3

MRI with non-echoplanar diffusion-weighted imaging (DWI) in the coronal plane is essential for differentiating cholesteatoma from other soft tissue pathology, with high sensitivity and specificity 1, 4, 5
DWI MRI differentiates cholesteatoma from scar tissue and inflamed granulation tissue, providing superior diagnostic accuracy compared to conventional MRI sequences 1, 5

CT temporal bone without IV contrast is the primary modality for detecting recurrent cholesteatoma, identifying abnormal, new, or enlarging lobulated material in the temporal bone region 3, 6, 7
MRI with DWI and delayed postcontrast T1-weighted imaging differentiates recurrent cholesteatoma from postoperative granulation tissue and scar, critical for distinguishing keratinous debris from non-cholesteatoma findings postoperatively 3, 6

The American College of Radiology advises against ordering CT with IV contrast, as it provides no additional necessary bony detail, and recommends against relying on CT alone for tissue characterization due to its poor specificity 1, 2
Plain radiography has no role in cholesteatoma diagnosis or surveillance, according to the American College of Radiology 3, 6
Preoperative imaging guides surgical approach and alerts surgeons to potential complications, affecting decisions regarding operation type and helping anticipate anatomic difficulties 1

Cholesteatoma typically presents with painless otorrhea and may be associated with tympanic membrane abnormalities including perforation, retraction pockets, and granulation tissue, according to the American Academy of Otolaryngology-Head and Neck Surgery 8
Any patient with suspected cholesteatoma should be referred to an otolaryngologist for definitive management, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 8
Preoperative high-resolution CT (HRCT) scan of the temporal bone is essential for surgical planning and can help estimate the degree of ossicular erosion, as suggested by the American College of Radiology 9, 10

CT temporal bone without IV contrast is recommended for postoperative surveillance to detect recurrence by evaluating for abnormal, new, or enlarging lobulated material, according to the American College of Radiology 10
CT temporal bone without IV contrast is also recommended to evaluate for subtle osseous erosions, as suggested by the American College of Radiology 10, 11
MRI with diffusion-weighted imaging (DWI) is suitable for postsurgical assessment to differentiate between keratinous debris (cholesteatoma) and non-cholesteatoma findings such as granulation tissue or scar, according to the American College of Radiology 10