--- title: "Steeple Sign, Thumb Sign & Tripod Sign Explained | Croup vs Epiglottitis" description: "ENT notes on Steeple sign, Thumb sign and Tripod sign." source: "The ENT Resident" author: "Dr. Mausumi Das" canonical_url: "https://www.theentresident.com/ent-notes-lectures/steeple-croup-thumb-tripod-sign-epiglottitis" categories: ["Signs, Syndromes, Triads, and Compilation Lists in ENT", "Larynx and Trachea"] video: "https://www.youtube.com/watch?v=90Vgve2ZjLQ" image: "https://media.theentresident.com/og-images/steeple-croup-thumb-tripod-sign-epiglottitis.png" --- # Steeple Sign, Thumb Sign & Tripod Sign Explained | Croup vs Epiglottitis ENT notes on Steeple sign, Thumb sign and Tripod sign. Watch the full video lecture on YouTube: https://www.youtube.com/watch?v=90Vgve2ZjLQ ## Steeple Sign, Thumb Sign & Tripod Sign Croup and Acute Epiglottitis are two important pediatric airway emergencies. Students often confuse the signs seen in these two conditions. In this post, we will discuss: * Steeple Sign * Thumb Sign * Tripod Sign --- ### Steeple Sign #### 📌 Type of Sign 👉 **Radiological sign** Seen on X-ray Neck AP View #### 🔍 What is the Sign? Steeple sign refers to **Narrowing of the subglottic airway** seen on an AP radiograph of the neck. This produces a characteristic tapered appearance of the upper airway. #### 🦠 Seen In **Croup (Acute Laryngotracheobronchitis)** #### 🧠 Why does it occur? In croup there is: * Inflammation * Subglottic edema The subglottic region becomes narrowed. Since the subglottis is already the **narrowest part of the pediatric airway**, even a small amount of edema produces marked airway narrowing. On the AP neck radiograph, the upper tracheal air column appears progressively narrowed and tapered. #### ⛪ Why is it called Steeple Sign? The tapering air column resembles the pointed top of a **Church steeple** Hence the name, **Steeple Sign**. > What is the most common causative organism of croup? > What is the narrowest part of the pediatric airway? > What is the typical presentation of croup? --- ### Thumb Sign #### 📌 Type of Sign 👉 **Radiological sign** Seen on X-ray Neck Lateral View. #### 🔍 What is the Sign? Thumb sign refers to **Enlarged swollen epiglottis** appearing as a **Thumb shaped soft tissue shadow** on a lateral neck radiograph. #### 🦠 Seen In **Acute Epiglottitis** #### 🧠 Why does it occur? Acute epiglottitis causes: * Severe inflammation * Marked edema of epiglottis * Edema of aryepiglottic folds The swollen epiglottis loses its normal thin leaf like appearance and becomes thick and rounded. #### 👍 Why is it called Thumb Sign? The swollen epiglottis resembles a human thumb. Hence the name: **Thumb Sign** > WHat is the most common organism causing acute epiglottitis? > What is the most dangerous complication of acute epiglottitis? > Should aggressive throat examination be performed in acute epiglottitis? --- ### Tripod Sign #### 📌 Type of Sign 👉 **Clinical sign** Observed during General physical examination. #### 🔍 What is the Sign? The child sits in a characteristic posture: * Leaning forward * Neck hyperextended * Chin thrust forward * Mouth open * Tongue protruding * Hands placed on knees or bed for support This posture is known as the **Tripod Position**. #### 🦠 Seen In **Acute Epiglottitis** #### 🧠 Why does it occur? In acute epiglottitis: * Epiglottis becomes swollen * Supraglottic airway becomes critically narrowed The child instinctively assumes the tripod position to maximize airflow. This posture: * Pulls the epiglottis anteriorly * Widens the supraglottic airway * Improves ventilation #### 🪑 Why is it called Tripod Sign? The posture resembles a **Three legged tripod**. Hence the name: **Tripod Sign** > What is the classical triad of acute epiglottitis? > What condition does hyperextended neck with drooling suggests? > What condition does barking cough with inspiratory stridor but no drooling suggests? --- ### ⭐ Rapid Revision Table | Sign | Type | Finding | Seen In | | --- | --- | --- | --- | | Steeple Sign | Radiological | Subglottic narrowing on AP neck X-ray | Croup | | Thumb Sign | Radiological | Swollen thumb-shaped epiglottis on lateral neck X-ray | Acute Epiglottitis | | Tripod Sign | Clinical | Leaning forward posture with neck extension | Acute Epiglottitis | --- ### 🧠 Viva Pearls * Steeple sign is seen in croup. * Thumb sign and tripod sign are seen in acute epiglottitis. * Steeple sign is seen on AP neck X-ray. * Thumb sign is seen on lateral neck X-ray. * Subglottis is the narrowest part of the pediatric airway. * Drooling strongly favors epiglottitis over croup. * Aggressive throat examination should be avoided in epiglottitis. * Tripod posture helps relieve supraglottic airway obstruction. --- ## About This Note This free ENT note on Steeple Sign, Thumb Sign & Tripod Sign Explained | Croup vs Epiglottitis was written by Dr. Mausumi Das and is paired with a corresponding video lecture. 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