---
title: "Complications of CSOM"
description: "ENT notes on Complications of CSOM - Intraoperative and Postoperative."
source: "The ENT Resident"
author: "Dr. Mausumi Das"
canonical_url: "https://www.theentresident.com/ent-notes-lectures/complications-csom"
categories: ["Otology"]
video: "https://www.youtube.com/watch?v=U6UXnesElSA"
image: "https://media.theentresident.com/og-images/complications-csom.png"
---

# Complications of CSOM

ENT notes on Complications of CSOM - Intraoperative and Postoperative. Watch the full video lecture on YouTube: https://www.youtube.com/watch?v=U6UXnesElSA

## 🦻 Complications of Chronic Suppurative Otitis Media (CSOM)

Not every case of CSOM develops complications - they occur in certain individuals due to a combination of **host, microbial, and environmental factors**.

Understanding **why** complications occur and **how** infection spreads is key to both **prevention and management**.

---

### ⚠️ Factors Influencing the Development of Complications

Complications generally occur when **infection is uncontrolled or inadequately treated**.  
The following are **predisposing factors**:

1️⃣ **Age**

- Commonly seen in:
  - **Children (1st decade)**  
  - **Elderly individuals**

2️⃣ **Poor Socioeconomic Status**

- Associated with:
  - **Overcrowding**
  - **Poor personal hygiene**
  - **Limited health education**
  - **Restricted access to healthcare**

- These factors together increase the risk of persistent infection → complications.

3️⃣ **Virulence and Resistance of Microorganisms**

Certain **antibiotic-resistant strains** make CSOM more difficult to control.

>Name some resistant micro organisms associated with CSOM and their mechanism of resistance.

4️⃣ **Immunocompromised Host**

Patients with **low immunity** are more prone to develop complications.

**Examples include:**
- AIDS
- Uncontrolled diabetes mellitus
- Organ transplant patients (on immunosuppressants)
- Cancer patients on chemotherapy

5️⃣ **Presence of Preformed Pathways**

Infections may spread easily beyond the middle ear if **natural or acquired defects** exist.

**Examples:**
- **Dehiscence** of the bony facial canal or tegmen tympani  
- **Post-surgical defects** (stapedectomy, fenestration)  
- **Temporal bone fractures**  
- **Perilymph fistula**  
- **Mondini’s abnormality**  
- **Dehiscence in the floor of middle ear over the jugular bulb**

These defects act as **shortcuts for infection spread** → facilitating intracranial or extracranial complications.

6️⃣ **Presence of Cholesteatoma**

- **Cholesteatoma** causes **osteitis** and **granulation tissue formation** → bone destruction.  

- This allows infection to spread into **adjacent spaces** → leading to serious complications.

---

### 🧬 Pathways of Spread of Infection

There are **three main routes** by which infection spreads beyond the middle ear cleft:

1️⃣ **Direct Bone Erosion** 

- **Acute Otitis Media:** Spread via **hyperemic decalcification**

- **Chronic Otitis Media:** Spread due to **osteitis** or **cholesteatoma erosion**

2️⃣ **Venous Thrombophlebitis**

- **Mechanism:**
  - Veins in **Haversian canals** → communicate with **dural veins**
  - These connect to **dural venous sinuses** and **superficial cerebral veins**

- Infection spreads → causes **sinus thrombophlebitis** and even **cortical vein thrombosis**.

3️⃣ **Preformed Pathways**

These are **anatomical or pathological defects** that facilitate spread:

| Type | Examples |
| --- | --- |
| **Congenital dehiscence** | Bony facial canal, floor of middle ear over jugular bulb |
| **Patent sutures** | Petrosquamous suture |
| **Previous skull fractures** | Sites healed by fibrous tissue — weak barriers |
| **Post-surgical defects** | After stapedectomy, fenestration, or exposure of dura |
| **Perilymphatic fistula** | Allows direct spread |
| **Normal openings** | Oval & round window, IAC, cochlear aqueduct, endolymphatic duct & sac |

>What is the most common route of Spread of Infection of CSOM?

>What is the most common route of Spread of acute infection?

---

### 🧩 Classification of Complications of CSOM

Complications of CSOM are broadly divided into:

#### A. Extracranial Complications

These are further subdivided into:

**1️⃣ Intratemporal Complications** (within the temporal bone)

- Mastoiditis  
- Petrositis  
- Facial nerve palsy  
- Labyrinthitis  

**2️⃣ Extratemporal Complications**

- Postauricular abscess  
- Zygomatic abscess  
- Bezold’s abscess  
- Luc’s abscess  
- Citelli’s abscess  
- Parapharyngeal / Retropharyngeal abscess  

#### **B. Intracranial Complications**

- Extradural abscess  
- Subdural abscess  
- Meningitis  
- Brain abscess  
- Sigmoid sinus thrombosis  
- Otitic hydrocephalus

---

## About This Note

This free ENT note on Complications of CSOM was written by Dr. Mausumi Das and is paired with a corresponding video lecture.

Canonical page of this note: https://www.theentresident.com/ent-notes-lectures/complications-csom

When citing or referencing this content, please credit The ENT Resident and link to the canonical page above.

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