A  CT-guided Fine Needle Aspiration Cytology (FNAC)  is a diagnostic procedure used to obtain tissue samples from a specific area within the body for analysis. Here are the key points:

1. Purpose:
To diagnose and evaluate abnormal growths or lesions by obtaining cellular samples from targeted areas.
Helps in the diagnosis of tumors, cysts, and other pathological conditions.

2. Contrast Agent:
Contrast may be used during CT imaging to better visualize the area of interest and guide the needle placement.

3. Imaging Technique:
CT scans are used to precisely locate and guide the fine needle to the area of concern.
Real-time imaging ensures accurate needle placement and sample collection.

4. Indications:
Diagnosis of solid tumors, lymph nodes, and abnormal masses in various organs (e.g., lung, liver, thyroid).
Evaluation of suspicious lesions detected by imaging or physical examination.

5. Protocol:
Patient is positioned and the CT scan is used to identify the precise location of the target area.
A fine needle is inserted through the skin to collect a sample from the abnormal area, guided by CT imaging.

6. Key Findings:
Provides cellular or tissue samples for microscopic examination to identify or rule out malignancy or other pathological conditions.
Helps in determining the nature (benign or malignant) and type of lesion.

7. Advantages:
Minimally invasive with high diagnostic accuracy due to precise targeting.
Allows for rapid and accurate diagnosis, aiding in timely treatment planning.

8. Safety Considerations:
Procedure involves minimal risk; potential complications include bleeding or infection at the needle insertion site.
Use of contrast involves minimal risk, with careful monitoring of allergic reactions.

9. Clinical Scenarios:
Used in cases where a non-invasive diagnostic approach is preferred, especially when assessing masses or lesions that are difficult to biopsy via other methods.