FNAC needle size
**Core Concept**
Fine-needle aspiration cytology (FNAC) is a diagnostic tool used to collect cell samples from superficial organs and masses for histopathological examination. The choice of needle size is crucial in FNAC to ensure accurate diagnosis and minimize complications.
**Why the Correct Answer is Right**
The correct needle size for FNAC depends on the site and depth of the lesion. For most superficial lesions, a 23-25 gauge (0.64-0.79 mm) needle is used, while for deeper lesions, a 20-22 gauge (0.89-1.07 mm) needle may be required. The smaller needle size allows for precise sampling and reduces the risk of bleeding and hematoma formation.
**Why Each Wrong Option is Incorrect**
* **Option A:** A 15 gauge (1.65 mm) needle is too large for FNAC and may cause significant bleeding and trauma to the surrounding tissue.
* **Option B:** A 30 gauge (0.30 mm) needle is too small and may not provide sufficient sample material for diagnostic purposes.
* **Option C:** A 10 gauge (2.41 mm) needle is excessively large and not suitable for FNAC, as it may cause significant damage to the surrounding tissue and organs.
**Clinical Pearl / High-Yield Fact**
When performing FNAC, it's essential to use the smallest needle size possible to minimize complications and ensure accurate diagnosis.
**Correct Answer: C. 10 gauge (2.41 mm) needle is excessively large and not suitable for FNAC, as it may cause significant damage to the surrounding tissue and organs.