Clue cells are seen in-
**Core Concept**
Clue cells are a microscopic finding used in the diagnosis of bacterial vaginosis (BV). They are vaginal epithelial cells with bacteria attached to their surface, often seen in cases of BV.
**Why the Correct Answer is Right**
Clue cells are formed when vaginal epithelial cells become colonized by bacteria, specifically Gardnerella vaginalis, which is a common cause of BV. The bacteria adhere to the surface of the epithelial cells, making them appear stippled or granular under microscopic examination. This characteristic appearance of clue cells is a key diagnostic feature of BV, particularly in the context of other clinical and laboratory findings.
**Why Each Wrong Option is Incorrect**
**Option A:** Clue cells are not typically seen in trichomoniasis, a sexually transmitted infection caused by the protozoan Trichomonas vaginalis.
**Option B:** While yeast overgrowth, or candidiasis, can cause vaginal discharge and itching, it does not typically result in the formation of clue cells.
**Option C:** Clue cells are not a feature of pelvic inflammatory disease (PID), which is a broader term encompassing a range of inflammatory conditions affecting the female reproductive tract.
**Clinical Pearl / High-Yield Fact**
Clue cells are a crucial diagnostic feature of bacterial vaginosis, but they must be interpreted in the context of other clinical and laboratory findings, such as a positive whiff test and an abnormal vaginal pH.
**Correct Answer:** C.