A 38-year-old woman undergoes parotidectomy for a benign mixed tumor of the superficial lobe. Intraoperatively, the surgeon identifies the facial nerve trunk at the stylomastoid foramen and traces its course through the gland. Postoperatively, the patient develops complete facial paralysis on the operated side within 24 hours. What is the most appropriate immediate next step in management?

Explanation

## Postoperative Facial Nerve Paralysis: Immediate Next Step **Key Point:** Complete facial paralysis occurring within 24 hours of parotidectomy — especially when the nerve was identified and traced intraoperatively — demands urgent imaging (MRI or CT) to rule out a surgically correctable cause such as hematoma or edema compressing the nerve before any other intervention. ## Why Urgent MRI is the Most Appropriate Immediate Next Step **High-Yield:** The differential for immediate post-parotidectomy facial paralysis includes: - **Hematoma** compressing the facial nerve — surgically reversible if identified early - **Edema** around the nerve — managed conservatively - **Neurapraxia** — conduction block from traction/manipulation, fully reversible - **Axonotmesis or Neurotmesis** — more severe injury requiring longer-term planning Urgent MRI of the parotid region is the **most appropriate immediate next step** because: 1. It identifies a compressive hematoma — a time-sensitive, surgically correctable emergency 2. It guides whether urgent re-exploration is warranted (hematoma present) vs. conservative management (edema/neurapraxia) 3. It is non-invasive and rapidly available **Clinical Pearl (Bailey & Love / Scott-Brown):** Immediate surgical re-exploration is indicated if there is evidence of nerve transection witnessed intraoperatively OR if imaging reveals a compressive hematoma. Without imaging confirmation, blind re-exploration risks additional nerve injury. ## Why the Other Options Are Incorrect | Option | Reason Incorrect | |--------|-----------------| | A — Reassure + eye care only | Premature; does not rule out compressive hematoma requiring urgent decompression | | C — Immediate surgical re-exploration | Not indicated without imaging evidence of transection or compression; risks unnecessary morbidity | | D — EMG/NCS immediately | EMG/NCS is unreliable in the first 72 hours (Wallerian degeneration not yet complete); standard timing is Day 3–5 post-injury | ## Management Algorithm ``` Complete facial paralysis post-parotidectomy (within 24 hrs) ↓ Urgent MRI parotid region ↓ Hematoma/compression? → YES → Surgical decompression ↓ NO Edema/neurapraxia suspected → Eye care + conservative management ↓ Day 3–5: EMG/NCS to assess degree of nerve injury ↓ Guide further management (conservative vs. delayed exploration) ``` **Reference:** Bailey & Love's Short Practice of Surgery (27th ed.); Scott-Brown's Otorhinolaryngology — imaging is the critical first step to differentiate compressive from non-compressive causes of immediate post-parotidectomy facial palsy.