Cytological method
Fine needle aspiration is now widely used as a diagnostic procedure for palpable masses (e.g., breast, lymph nodes, soft tissue masses). Ultrasound or CT scan guided FNA (and/or true cut needle biopsy) is also being increasingly used for deep-seated masses as Lung, liver, kidney, retroperitoneum, etc.
Exfoliative cytology e.g., from cervix, urine, sputum, and body fluids has been widely used for diagnosis. It is particularly useful to detect and follow up preinvasive malignancy in the cervix early diagnosis.
Brush cytology techniques has been useful in endoscopic procedures .
Cytological diagnosis depends on the identification of features of anaplasia in cells and masses exfoliated, aspirated or brushed.
In experienced hands, false positive diagnoses are uncommon, but false negative results occur due to sampling errors
Whenever possible cytological diagnosis of cancer should be confirmed by histopathological study of biopsy or frozen section as in breast masses
Fine Needle Aspiration:
Fine needle aspiration is a type of biopsy procedure. In fine needle aspiration, a thin needle is inserted into an area of abnormal-appearing tissue or body fluid
As with other types of biopsies, the sample collected during fine needle aspiration can help make a diagnosis or rule out conditions such as cancer
Fine needle aspiration is generally considered a safe procedure, rapid, low cost and used for the differential diagnosis between benign and malignant lesions Complications are infrequent.
A lump may be felt during a doctor's examination. Or it may be discovered on an imaging test such as : CT scan, mammogram, and ultrasound.
Doctors may recommend fine needle aspiration for areas such:
1-cysts fluid-filled lump, and this used as diagnostic for nature of cyst and therapeutic as in thyroid colloid cyst.
2-nodules or masses solid lumps.
3-enlarged lymph nodes.
Common complications include bruising and soreness. There is a risk, because the biopsy is very small (only a few cells), that the problematic cells will be missed, resulting in a false negative result. There is also a risk that the cells taken will not enable a definitive diagnosis.
