A patient has bullous Lesion.Which of the following is seen on on Tzank smear –
**Core Concept**
The Tzank smear is a diagnostic tool used to identify viral infections, particularly herpes simplex virus (HSV), varicella-zoster virus (VZV), and coxsackievirus, which can cause bullous lesions. The smear involves examining the cytological features of cells from the base of a blister or skin lesion.
**Why the Correct Answer is Right**
The Tzank smear is particularly useful for diagnosing herpes simplex virus (HSV) infections, which often present with bullous lesions. On a Tzank smear, the presence of multinucleated giant cells is characteristic of HSV infection. These cells are formed due to the fusion of adjacent epithelial cells, resulting from the action of the HSV glycoproteins and the viral replication machinery. The multinucleated giant cells have multiple nuclei, which are often pyknotic or fragmented.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the Tzank smear, which is used to diagnose viral infections, not bacterial or fungal infections.
* **Option B:** While the Tzank smear can be used to diagnose varicella-zoster virus (VZV) infections, the characteristic finding is the presence of multinucleated giant cells, not the option listed.
* **Option C:** This option is not related to the Tzank smear or its diagnostic findings.
**Clinical Pearl / High-Yield Fact**
When interpreting a Tzank smear, it's essential to remember that the presence of multinucleated giant cells is a hallmark of HSV infection. This can be a useful diagnostic clue, particularly in patients with bullous lesions.
**Correct Answer:** C. Multinucleated giant cells are characteristic of HSV infection.