RD7.2 | Imaging in ENT — Assignment

CLINICAL SCENARIO

A 34-year-old man is referred to the ENT department with a 6-month history of progressively worsening, foul-smelling discharge from the left ear, accompanied by a gradual reduction in hearing on that side. Over the past two weeks he has developed intermittent dull headache and, in the last three days, mild giddiness on quick head movements. On examination the external canal contains scanty offensive discharge; after cleaning, otoscopy reveals an attic (postero-superior) retraction pocket filled with whitish debris. Tuning-fork tests indicate a conductive component on the left. The ENT surgeon suspects unsafe chronic suppurative otitis media (CSOM) with cholesteatoma and requests imaging before surgery. The HRCT temporal bone is reported as: a non-dependent soft-tissue mass in Prussak's space and the attic, blunting (erosion) of the scutum, erosion of the long process of the incus and the body of the malleus, and possible thinning of the tegmen tympani; the labyrinth and facial nerve canal appear intact. You are the clinician responsible for integrating these imaging findings into the patient's management.

1. Justify the imaging request

Explain why imaging is indicated in this patient when, in general, otitis media is a clinical diagnosis. Identify the specific red-flag features in the history and examination that justify a scan, and state which modality (and why) is first-line for this clinical question.

Guidance: Anchor your answer in the principle 'image the complication, not the infection', and the physics rule that CT characterises bone while MRI characterises soft tissue/nerve.

2. Interpret the HRCT findings

Take each reported finding in turn (non-dependent soft tissue, scutum erosion, ossicular erosion, tegmen thinning) and state what anatomical structure it refers to and what it signifies. Explain how this combination distinguishes cholesteatoma from a simple inflammatory effusion or granulation tissue.

Guidance: Read the scan by asking the two structured questions: where is the disease, and what has it destroyed?

3. Translate findings into a surgical plan

Describe how each finding changes what the surgeon does — for example, how ossicular erosion affects reconstruction (ossiculoplasty), how scutum/attic disease and tegmen thinning influence the choice and extent of the mastoid procedure, and which findings would prompt heightened intra-operative caution.

Guidance: RD7.2 is a 'knows-how' competency: the report must literally change the operation, not merely describe anatomy.

4. Address the new symptoms and any further imaging

The patient has developed headache and positional giddiness. Discuss which complications you must actively exclude, what additional imaging (if any) you would request and why, and identify the single finding in the existing report that is most reassuring and the one that most warrants caution.

Guidance: Consider when contrast-enhanced CT or MRI becomes necessary for suspected intracranial or labyrinthine extension, and note that the intact labyrinth/facial canal is reassuring.

5. Counsel the patient and plan follow-up

Outline, in lay terms, how you would explain the diagnosis, the need for surgery, and the risk of residual or recurrent disease. State which imaging modality you would use to monitor for recurrent cholesteatoma after surgery and why it is preferred over repeat CT.

Guidance: Recall the role of non-echo-planar (non-EPI) diffusion-weighted MRI in detecting residual/recurrent keratin and potentially avoiding a second-look operation.