Fine Needle Aspiration (FNA) under image guidance has gained increasing acceptance as the diagnostic procedure of choice for patients with focal hepatic lesions. It can be performed percutaneously or endoscopically. However, the latter approach is technically difficult for lesions located far away from the tip of the echoendoscope and lesion near the 2nd or 3rd portion of the duodenum due to poor visualization  .
FNA may also be performed at laparoscopy or laparotomy under direct vision when imaged guided FNA fails to provide diagnostic tissue  .
The specificity of FNA cytology of the liver approaches 100% and the sensitivity ranges from 67% - 100%, averaging about 85%  -  .
FNA alone is superior to core biopsy alone because the needle is longer and can be guided, and the procedure can be easily repeated. FNA is often preferred in sampling deeply placed lesions, sites adjacent to major vessels, or in situations in which needles are to be passed through the bowel wall. However, both methods are complimentary to each other     .
The occurrence of complications after hepatic FNA is rare with about 0.5% minor complications, 0.05% major complications requiring surgery, and less than 0.01% mortality     . They are limited largely to hemorrhage. The frequency of complications is often related to the vascularity and the location of the lesions as well as the needle size  . Another concern is the subcutaneous seeding of tumor along the needle tract during percutaneous liver FNA. It is still an extremely rare complication when using a needle of 23 gauges or less    .
Absolute contraindications for FNA of liver include uncorrectable bleeding diathesis, lack of a safe access route, e.g. vascular structure in the biopsy path, hydatid cyst and uncooperative patients.
Several studies have shown that the assistance of cytopathologists during the procedure increases overall accuracy    . The latter is attributed to the ability to assess specimen adequacy at the time of procedure and to determine if additional tissue is required for diagnosis and/or ancillary studies such as flow cytometry  .
A markedly elevated serum AFP level, >1000 ng/ml, is highly suggestive of HCC or in children, hepatoblastoma. A moderate increase in serum AFP, however, is non-specific and can be seen in a wide variety of benign and malignant conditions   .
Aspirates of normal liver consist predominantly of hepatocytes and scattered bile duct epithelial cells. Other cell types such as endothelial cells and Kupffer’s cells are infrequently noted    .
Hepatocellular carcinoma (HCC) is the most common primary hepatic malignancy  . Cirrhosis may be sampled by FNA when a dominant nodule mimics a HCC radiologically. The cytology of cirrhotic liver is similar to that of normal liver   . AFP level and the finding of a single lesion with or without satellite lesions on imaging, favor a primary tumor over metastatic disease  .
Up to the knowledge of the researcher, no previous scientific study has been conducted about ultrasonically guided FNA in Sulaimani city or Kurdistan region. Therefore, the purpose of this study is to examine the diagnostic value of ultrasonically guided percutaneous FNA cytology in the diagnosis of focal liver lesions.
2. Patients and Methods
This is a prospective study conducted in Kurdistan center for Gastroenterology and Hepatology and the Sulaimani General Teaching Hospital over one year. After the agreement by the ethical committee of the School of Medicine, University of Sulaimani, one hundred patients with Focal liver lesions were studied.
Adult patients with Focal liver lesion(s) that were identified by imaging studies (ultrasound, Computerized Tomography, Magnetic Resonant Imaging) were included.
1. All cystic lesions proved by imaging studies.
2. Any lesion less than 1 cm in diameter (difficult to target).
3. Any inaccessible lesion deeper than the length of 22 G × 31/2 spinal needle
4. Gross Ascites.
5. Un-cooperative patients.
6. Uncorrectable coagulopathy (INR > 2.5), by fresh frozen plasma and/or Vitamin K
7. Patient’s refusal.
We obtained informed consent from the patients, and after taking proper history and performing a thorough examination, ten ml venous blood were aspirated for the following laboratory tests; (complete blood Count, ESR, TSB, AST, ALT, PT, INR, Serum Albumin, Blood Urea, Blood glucose, Serum Alkaline Phosphatase, Alfa feto protein, Carcinoembryonic Antigen, CA19-9, CA 125, HBs Ag, HCV Ab).
Using sterile technique, the skin was cleansed with povidone Iodine USP 10% (1% available Iodine). The ultrasound guidance was done by an experienced ultrasonographer using SONAC 8000 Live (prime) MEDISON device with a probe of 3.5 MHz, convex free hand technique. After the localization of the lesion (s), the needle (spinal needle 22 G × 31/2) was advanced under continuous ultrasound guide through the skin and soft tissue and into the target mass. After ensuring the correct position of the needle tip, the trocar was removed and a 10 ml syringe was attached; then a 2 - 3 ml negative pressure was applied while performing 2 - 4 punctures of the wall and central part of the lesion, then the needle was withdrawn and the specimen was distributed over slides which were immediately placed into a 95% alcohol solution for 20 minutes, and then, it was left to dry and later sent for cytological examination.
All slides were studied by two expert pathologists. Follow up was done for all patients after the procedure for 6 hours to observe any complications. Statistical analysis was done using SPSS Software version 17.
One hundred patients with focal liver lesion (s) were enrolled in this study, 54 patients were male (54%), and 46 were female (46%). Age of the patients ranged between 23 to 88 years with (a mean age + SD) of 55 ± 5.36 year. The majority (64%) of patients were above 60 years (Figure 1).
The most common presenting symptoms among the patients were fatigue and weight loss (90% and 78% respectively), while the most common sign was hepatomegaly (38%). Therefore, the rest of the symptoms and signs are illustrated in Table 1.
Anemia and high ESR was found in (54% and 90% respectively) and low serum albumin in (64%), Table 2.
Viral markers had been performed for all the patients, and only 8 patients (8%) had positive results of HBs Ag. Four HBs Ag positive cases had secondaries and four cases had hepatocellular carcinoma by FNAC. None were positive for HCV.
Table 5 demonstrates the sites of primary tumors.
Table 6 compares the trans-abdominal ultrasound of the studied patients with the results of ultrasonic guided FNAC.
Table 1. Clinical characteristics of the studied patients (N = 100).
Table 2. Hematological, biochemical investigations of the study population (N = 100).
Table 3. Tumor markers of the studied patients.
Table 4. U/S distribution of liver lesions (N = 100).
Table 5. The primary sites of liver secondaries.
Figure 1. Age and gender distribution of cases (N = 100), P-value = 0.64 (there is no significant difference between age groups and no significant difference between ≥ 60 years and <60 years; P = 0.89).
Table 6. Ultrasonography findings vs. FNAC results.
Sixty two (62%) patients (38% males and 24% females) were found to be free from pain during and after the procedure, while 38 (38%) patients (16% males and 22% females) had developed mild and transient right hypochondrial pain.
Focal liver lesions (FLL) have been a common reason for the consultation faced by gastroenterologists and hepatologists. It is important to consider not only malignant liver lesions, but also benign solid and cystic liver lesions such as hemangioma, focal nodular hyperplasia, hepatocellular adenoma, and hepatic cysts in the differential diagnosis  . Fine Needle Aspiration cytology is a safe and effective method of establishing a definitive diagnosis of either metastatic or primary malignancy   . FNA cytology is usually guided by ultrasound or CT   .
The use of Fine Needle technique has been shown to shorten the length of hospitalization, obviate the need for more invasive procedures including laparoscopy and considerably lower the cost of hospitalization in many situations  .
The Sonographic FNA technique requires no more time than a routine abdominal scan which is usually less considerable. This technique also may be performed portably or outside the ultrasound laboratory when necessary  .
This study was performed on 100 patients. However, most of them were adult and elderly age groups, 18 patients (18%) between 50 to 59 years and 64 patients (64%) were beyond 60 years of age, which indicates that the liver masses are most common in the elderly age group as it is a usual age for malignancy.
The most common presenting symptoms among the patients were fatigue and weight loss (90% and 78% respectively), while the most common signs were hepatomegaly, which is comparable to other study  .
Anemia and high ESR found in (54% and 90% respectively) and low serum albumin in 64% is expected in people with malignancy  .
Most of the patients in our study proved by FNAC as cases of secondaries (80%) were close to that found by ultrasound (90%) which means that the (p) value of FNAC is (0.001), which indicated the significance of FNA in comparison to radiological findings. Furthermore, we did not compare our procedure to histopathological examination which is definitive diagnosis of benign or malignant lesions, because it is unwise to do laparotomy for suspicion of multiple secondaries in elderly and end stage patients.
The finding of high percent (80%) of secondary lesions in the liver in our study was similar to another study which found the overall accuracy to be 92% and 94% respectively. The specificity of the procedure was 100%. Ultrasonically guided fine-needle aspiration cytology followed by cytological examination appears indispensable in the diagnosis and differentiation between benign and malignant hepatic and pancreatic focal lesions  .
FNA is superior in the diagnosis of HCC because 6 cases of HCC were diagnosed by Ultrasound. Therefore, 10 cases proved HCC by FNA, accompanied by high tumor markers (AFP) which is more supportive for HCC.
In this study, the FNA results of 7 patients (7%) were inconclusive or contained blood elements. In two of them, ultrasound had suggested secondary lesion, but CT scan showed simple cyst. Later on, FNA was done and the result was just blood. Thus, the clinical course of the patient and the tumor marker were in favor of non malignant lesion.
This was comparable to the study done by Wei Ding et al in Hangzhou, China which was performed on 46 patients. Thus, 6 patients had Red Blood Cells on aspirations which are in agreement with other study   .
One patient had history of breast carcinoma with mastectomy, but on follow up, focal liver lesion found. The Radiologist and Oncologist suspected secondary for which FNA was done, and fortunately, the results was sheets of pus cells. The sample sent for culture and it revealed the growth of Staphylococcus aureus; and also, tumor markers and clinical course of the disease suggest non malignant lesions i.e. ultrasonic examination alone cannot differentiate benign from malignant lesion definitely and thus, it is better to decide on radiological examination, FNAC and tumor markers.
The outcome of the procedure in our study was very favorable. Therefore, only mild non persistent right hypochondrial pain was seen in 38% of the patients. Our outcome has been comparable to that reported in other studies  . At the same time, this very accepted outcome indicates that post procedure ultrasonography is unnecessary and should only be reserved when a major complication is suspected  .
Fine Needle Aspiration Cytology is minimally invasive and a rapid method for pathologic evaluation of focal hepatic masses. Early evaluation and workup is important for early management. Thus, the most common focal liver lesions are hepatic secondaries which are more common in elderly patients. Radiological examination, whether by ultrasound or CT scan alone cannot differentiate between benign or malignant lesions definitely and should be followed and confirmed by FNA under imaging scan.