**Question:** Acetic acid staining of cervix shows the following EXCEPT:

A. PAP smear
B. Squamous cells
C. Endocervical cells
D. Glandular cells

**Core Concept:**
Acetic acid staining is a simple and widely used method to evaluate cervical lesions in Papanicolaou (PAP) smear tests. It involves applying a 10% solution of acetic acid to the cervical smear and observing changes in cell morphology. Normal cervical cells, such as squamous cells and endocervical cells, become pale and lose their nuclear details, while abnormal cells retain their nuclear details and appear as "punched-out lesions." Glandular cells, on the other hand, show nuclear enlargement and abnormal nuclear details, making them distinguishable from normal cells.

**Why the Correct Answer is Right:**
The correct answer, A - PAP smear, is not mentioned because PAP smear refers to the technique used to collect cervical cells for examination, not the staining method itself. Acetic acid staining is used to visualize the cells after collection in the PAP smear.

**Why Each Wrong Option is Incorrect:**
A. Squamous cells: These cells are included in the staining process as they are the primary target cells in the cervical smear test. Squamous cells demonstrate loss of nuclear details upon acetic acid staining, which aids in identifying abnormal cells.
B. Endocervical cells: Similar to squamous cells, endocervical cells undergo loss of nuclear details upon acetic acid staining. This characteristic helps in distinguishing normal from abnormal cells.
D. Glandular cells: Glandular cells show nuclear enlargement and abnormal nuclear details upon acetic acid staining, which makes them more evident compared to normal cells.

**Clinical Pearl:**
Understanding the staining characteristics of different cervical cell types is essential in interpreting cervical smear tests. Acetic acid staining helps in detecting abnormal cells by highlighting their unique features like nuclear details preservation or alteration, which are crucial for diagnosing cervical lesions like cervical intraepithelial neoplasia (CIN) and cervical cancer.