Hordeoluminternum isasuppurativeinflammation of the:
**Core Concept**
Hordeolum internum is a type of suppurative inflammation of the eyelid, specifically involving the meibomian glands. This condition is characterized by an acute bacterial infection leading to a painful, swollen, and purulent nodule on the eyelid.
**Why the Correct Answer is Right**
The meibomian glands are sebaceous glands located within the tarsal plate of the eyelid. They produce meibum, a type of sebum that helps to lubricate the eye. Infection of these glands can lead to the formation of a hordeolum internum, which is a localized collection of pus and inflammatory cells. The bacteria Staphylococcus aureus is a common causative agent of this condition.
**Why Each Wrong Option is Incorrect**
* **Option A:** Hordeolum externum is a suppurative inflammation of the eyelid, but it affects the hair follicle of the eyelashes, not the meibomian glands.
* **Option B:** Blepharitis is an inflammation of the eyelid, but it can affect the marginal or posterior parts of the lid, and is not limited to the meibomian glands.
* **Option C:** Chalazion is a non-suppurative inflammation of the meibomian glands, but it does not involve infection and typically presents as a painless, hard nodule.
**Clinical Pearl / High-Yield Fact**
Hordeolum internum can be treated with warm compresses, antibiotics, and incision and drainage in severe cases. It's essential to distinguish it from chalazion, which does not require antibiotic treatment.
**Correct Answer:** C.