In lichen planus the basal cells which are shrunken with an eosinophilic cytoplasm and with a pyknotic and fragmented nuclei are called
First, I remember that lichen planus has a band-like lymphocytic infiltrate at the dermo-epidermal junction. The epidermal changes include saw-tooth rete ridges and hyperkeratosis. But the question is specifically about the basal cells that are shrunken with eosinophilic cytoplasm and pyknotic nuclei.
Now, I think of the term for these cells. There's something called "civatte bodies" or "civatte's bodies," which are the shrunken, eosinophilic, pyknotic basal cells seen in lichen planus. They are also known as colloid bodies. Another term I've heard is "civatte's bodies," which are the same as colloid bodies. Wait, but sometimes there's confusion between colloid bodies and Civatte bodies. Let me verify. Colloid bodies are the same as Civatte bodies, right? Yes, they are the same and are a hallmark of lichen planus. So the correct answer should be Civatte bodies or colloid bodies.
Looking at the options, the correct answer is likely option C or D, but since the user hasn't provided the options, I need to make sure. The question is asking for the term for these specific cells. So the key term here is "civatte bodies."
Now, why are the other options incorrect? Let's think. If the options included "Koebner phenomenon," that's not a histopathological finding but a clinical feature where lesions appear in areas of trauma. If there's "Pautrier microabscesses," those are seen in mycosis fungoides, a type of T-cell lymphoma. "Russell bodies" are intracellular inclusions in plasma cells, not related to lichen planus. "Munro microabscesses" are in psoriasis. So any of these would be incorrect.
The clinical pearl here is that Civatte bodies (or colloid bodies) are pathognomonic for lichen planus. Remembering that they are the shrunken, eosinophilic, pyknotic basal cells in lichen planus is key. Also, differentiating them from other microabscesses or bodies in other conditions is important for exam questions.
**Core Concept**
Lichen planus is a chronic inflammatory mucocutaneous disease characterized by a band-like lymphocytic infiltrate at the dermo-epidermal junction. Histopathologically, **Civatte bodies** (or **colloid bodies**) are hallmark features—shrunken basal keratinocytes with eosinophilic cytoplasm and pyknotic, fragmented nuclei.
**Why the Correct Answer is Right**
Civatte bodies result from apoptosis of basal keratinocytes due to immune-mediated damage. These cells are shrunken, eosinophilic, and pyknotic, representing a unique histopathological hallmark of lichen planus. They are distinct from other degenerative changes like Pautrier microabscesses (seen in mycosis fungoides) or Munro microabscesses (