A 28-year-old man with unilateral otosclerosis (left ear, air-bone gap 35 dB) undergoes successful left stapedectomy with ossicular reconstruction. Six weeks post-operatively, he reports sudden-onset severe vertigo, nausea, and nystagmus. Audiometry shows new sensorineural hearing loss (15 dB) in the operated ear. Otoscopy is normal. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis: Post-Stapedectomy Complication — Urgent Imaging Required **Key Point:** Sudden-onset vertigo + new sensorineural hearing loss (SNHL) after stapedectomy is a red flag combination mandating urgent imaging before any surgical or conservative decision is made. ## Why MRI Temporal Bone is the Best Next Step The clinical triad of **sudden vertigo + nystagmus + new SNHL** at 6 weeks post-stapedectomy raises concern for: - **Perilymphatic fistula (PLF):** Tear in the oval or round window membrane → perilymph leaks into middle ear → labyrinthine dysfunction - **Prosthesis malposition/migration:** Prosthesis too long → plunges into vestibule → direct labyrinthine trauma - **Serous or suppurative labyrinthitis:** Less likely with normal otoscopy and no fever Both PLF and prosthesis malposition are **surgical emergencies**, but the correct next step is **imaging first** to confirm the diagnosis and guide the specific surgical approach — not to proceed blindly to the operating room. ## Why NOT the Other Options | Option | Why Incorrect | |---|---| | **A — Immediate revision surgery** | Premature without imaging confirmation; blind revision risks further labyrinthine damage; imaging takes <1 hour and directly guides surgical planning | | **B — Oral steroids + bed rest; image only if >2 weeks** | Dangerous delay; PLF with SNHL requires imaging within days, not weeks; the 2-week threshold is not supported by Cummings or Scott-Brown guidelines | | **D — Vestibular rehab + 4-week observation** | Appropriate only for isolated post-op BPPV or serous labyrinthitis (no SNHL); new SNHL excludes a benign diagnosis and mandates urgent workup | ## MRI Advantages in This Setting 1. **T2-weighted sequences** detect perilymph in the oval window niche (hyperintense fluid signal) 2. **FIESTA/CISS sequences** assess labyrinthine integrity and endolymphatic hydrops 3. **No significant metal artifact** from titanium or platinum stapes prostheses 4. **High soft-tissue contrast** superior to CT for labyrinthine pathology > **CT temporal bone** is the complementary study if MRI is contraindicated — it directly visualises prosthesis position, length, and ossicular alignment. ## Management Algorithm ``` Post-stapedectomy vertigo + new SNHL ↓ MRI temporal bone (± CT if MRI unavailable) ↓ PLF / prosthesis malposition confirmed → Urgent revision surgery Normal imaging → Serous labyrinthitis → High-dose steroids + bed rest → Vestibular rehab if persistent ``` **Clinical Pearl:** Post-stapedectomy vertigo alone occurs in 10–30% of cases and is usually benign (BPPV, serous labyrinthitis). The addition of **new SNHL** transforms this into a surgical emergency until structural pathology is excluded by imaging. **High-Yield:** The sequence is always **Image → Diagnose → Operate**, not **Operate → Hope**. Immediate revision without imaging (Option A) risks converting a repairable fistula into permanent labyrinthine destruction. [cite: Cummings Otolaryngology 7e, Ch 131 — Otosclerosis and Stapedectomy; Scott-Brown's Otolaryngology 8e, Ch 3.15 — Complications of Stapes Surgery]