International Journal of Current Research and Review
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IJCRR - 4(21), November, 2012

Pages: 95-101

Date of Publication: 15-Nov-2012


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ROLE OF FINE NEEDLE ASPIRATION CYTOLOGY IN SALIVARY GLAND PATHOLOGY AND ITS HISTOPATHOLOGICAL CORRELATION: A TWO YEAR PROSPECTIVE STUDY IN WESTERN INDIA

Author: Agravat Amit H., Dhruva Gauravi A., Pujara Krupal M., Sanghvi Hardik K.

Category: Healthcare

Abstract:Background and objectives: Salivary gland lesions account for 2-6.5% of all the neoplasm of the head and neck. Fine needle aspiration cytology (FNAC) is being increasingly used in the diagnosis of salivary gland lesions. The objective of this study was to evaluate the diagnostic accuracy and the sensitivity and specificity of FNAC in various salivary gland lesions in correlation with their histopathology, which helps in the appropriate therapeutic management. Methods: A total of 120 FNACs were done on salivary gland tumors from July 2010 to June 2012 in the Department of Pathology, P.D.U. Government Medical College, Rajkot (Gujarat, India). Formalin fixed (10%), surgically resected specimens were received, they were processed and slides were prepared for histopathological diagnosis. The stained cytological and histopathological slides were studied, analyzed and correlated. Results: The cytomorphological features were studied and analyzed and the following lesions were observed: Pleomorphic adenoma (88), Warthin's tumor (2), Cystic lesion (4), Mucoepidermoid carcinoma (6), Acinic cell carcinoma (2), Primary lymphoma (2), Carcinoma EX pleomorphic adenoma(4), metastatic malignancy deposits (2), benign parotid tumor (8) and malignant tumor (unspecified)(2). A histopathological correlation was available in 78 cases. Out of these, 71 cases were true positive, 1 was false positive, 2 were false negative and 4 were true negative. Interpretation and conclusion: The overall sensitivity, specificity and the diagnostic accuracy were 97%, 80% and 92% respectively. Hence, the appropriate therapeutic management could be planned earlier. This study documents that FNAC of the salivary gland tumors is accurate, simple, rapid, inexpensive, well tolerated and harmless for the patient.

Keywords: Salivary gland tumors, FNAC, Diagnostic accuracy, Sensitivity, Specificity, Benign, Malignant.

Full Text:

INTRODUCTION
Fine needle aspiration cytology (FNAC) is accurate, simple, rapid, inexpensive, well tolerated and harmless for the patient (1),(2),(3),(4),(5). Although salivary gland tumors are rare and they account for 2-6.5% of all the head and neck tumors, their superficial location, easy accessibility and high diagnostic accuracy makes FNAC a popular method for evaluating them (6),(7),(8). Among the primary epithelial tumors, 64-80% occur in the parotid glands, 7-11% occur in the sub-mandibular, less than 1% occur in the sublingual and 9-23% occur in the minor salivary glands (1),(9),(10). In the files of the Armed Forces Institute of Pathology, about 1/3rd of the major gland and half of the minor gland tumors are malignant (10). The ratio of the malignant to the benign tumor is the greatest (>2.3:1) in the sub-lingual gland and in the minor salivary glands of the tongue, the floor of the mouth and the retromolar area (11). A review of the recent reported series found that the diagnostic sensitivity of FNAC varied from 81-100%, that the specificity varied from 94-100% and that the diagnostic accuracy varied from 61- 80% (11),(12). Hence, the appropriate therapeutic management could be planned earlier, whether it was local excision for benign neoplasm, conservative management for non-neoplastic lesions, radical surgery for malignant tumors and chemotherapy or radiotherapy for metastasis and lymphoproliferative disorders (8). Hence, the present study was done to know the diagnostic accuracy, which helps in an early diagnosis and appropriate therapeutic management.

SUBJECTS AND METHODS
The present prospective study was undertaken from July 2010 to June 2012 at the P.D.U. Government Medical College, Rajkot (Gujarat, India), which comprised of 120 cases of salivary gland tumors which were diagnosed by FNAC. After taking the informed consent, the aspiration was done following a thorough clinical examination. The cytological findings were correlated with the histopathology.

MATERIAL AND METHODS
The nodule of interest was palpated and fixed with the thumb and the index finger of one hand. Under aseptic precautions, a 10 cc syringe with a 22-25 gauge needle was introduced into the nodule. The material was aspirated and smeared onto clean glass slides. The air dried and ethanol fixed smears were stained with Giemsa and Haematoxylin and Eosin (HandE) respectively. In cases of fluid aspiration, slides were prepared from the centrifuged sediment. Formalin fixed (10%), surgically resected specimens were received in the Department of Pathology, processed and stained with haematoxylin and eosin for histopathological examination. Special stains like PAS was done wherever required. The stained cytological and histopathological slides were studied, analyzed and correlated. RESULTS During the study period, 343 cases of salivary gland swellings were aspirated, out of which 120 were diagnosed as salivary gland tumors by FNAC. Among these, histopathological correlations were available for 78 cases. All the cases occurred in the age group of 11-80 years and a majority of them were seen in the range of 21-30 years (25%), with a male to female ratio of 1.4:1 (Table/Fig 1). The number of cases which were seen in the parotid gland, the sub-mandibular gland and the minor salivary glands were 74(61.7%), 42(35%) and 4(3.33%) respectively. There were 102 (85%) benign and 18(15%) malignant tumors. The commonest gland which was involved was the parotid gland in both males i e., 44(59%) and females 30(41%). Out of the 120 cases, 88(73.33%) were pleomorphic adenomas (PA), 2 (1.7%) were Warthin’s tumors (WT), 6(5%) were mucoepidermoid carcinomas (MEC), 2(1.7%) were acinic cell carcinomas, 4(3.33%) were carcinoma ex pleomorphic adenomas, 2(1.7%) were primary lymphomas of the parotid gland, 2(1.7%) were metastatic deposits, 8(6.7%) were benign parotid tumors, 4(3.33%) were cystic lesions and 2(1.7%) were malignant tumors (unclassified) (Table/Fig2). PA and MEC were the commonest benign and malignant tumors respectively. There were 88 PAs, out of which only 64 cases had a histopathological correlation. Fifty two of them were concordantly diagnosed as PA histopathologically. Two cases each were of basal cell adenoma, myoepithelioma, WT and MEC, whereas 4 were diagnosed as sialadenosis by histopathology. Out of 2 cases of WT, 1 was concordantly diagnosed by histopathology, whereas the other one was not available for correlation. Among the 8 cases of benign parotid tumors, a histopathological correlation was available for 6 and all were diagnosed as PA. Among 4 cases of cystic lesions, all were histopathologically correlated. Of these, 2 were diagnosed as mucocele and the other 2 as benign lymphoepithelial cysts. Among 4 cases of carcinoma ex PA, 2 were available for histopathological correlation, which were diagnosed as MEC. Among 4 cases of MEC, 2 were concordantly diagnosed by histopathology. Two cases were reported as acinic cell carcinomas, both of which were not available for histopathological correlation. There were 2 cytologically diagnosed cases of primary lymphoma of the parotid, both of which were concordantly diagnosed by histopathologically as non-Hodgkins lymphoma- diffuse large B cell type. Two cases were cytologically diagnosed as metastatic squamous cell carcinomas, both of which were not available for histopathological correlation. In the above cyto-histopathological correlation study, the sensitivity, specificity and the diagnostic accuracy were 97%, 80% and 96%. DISCUSSION Salivary gland neoplasm are rare and they account for 2 to 6.5% of all the neoplasm of the head and neck (1). Among all the parotid gland tumors, 15- 30% was malignant, in contrast to about 40% in the submandibular gland, 50% in the minor salivary gland and 70-90% in the sublingual glands. The likelihood that a salivary gland tumor being malignant is inversely proportional to the size of the gland. Salivary gland tumors usually occur in adults, but 5% can occur in children who are younger than 16 years of age. FNAC of the salivary gland tumors is advantageous for both the patients and the clinicians because of its immediate results, accuracy, lack of complications and economy (8). Many studies have revealed the high diagnostic accuracy of FNAC when it was used for salivary gland tumors (13), (14), and (15). Pleomorphic Adenoma PA is the most common tumor which accounts for 60-70% of all the salivary gland tumors. These tumors occur in the middle age group and they can be bilateral in 5-6% of the cases. They have a striking sex difference, with 85-90% of the cases occurring in the male population. The reliability of FNAC in diagnosing PA has been reported as 90- 97% (13). Among the 120 cases of salivary gland tumors in the present study, 88 cases (73.3%) were diagnosed as PA cyto-logically. Sixty four of them were available for histopathological correlation, out of which 52 were concordantly diagnosed. The commonest changes which were observed were epithelial and mesenchymal like elements with a wide variety of patterns within the tumor. The commonest elements that were seen included fibrous, mucinous, myxochondroid and chondroid tissues. Out of the 64 cases which were histopathologically correlated, 2 were discordantly diagnosed as basal cell adenomas and 2 as myoepitheliomas. In both these cases, the FNAC slides were reviewed; both showed highly cellular smears with scanty stromal elements and were mistakenly diagnosed as PA. From the practical perspective, this confusion was of minor importance, since the surgical treatment was similar in both the cases. Two cases were discordantly diagnosed as Warthin’s tumor. The reviewed FNAC slides showed an oncocytic change, which we suspected as epithelial cells with metaplastic change. The lymphoid component was not present in the FNAC slides due to a sampling error. There were 2 cases of false negative diagnoses in our study, which were diagnosed as mucoepidermoid carcinomas histopathologically. This erroneous diagnosis was due to a sampling error. This can occur when the malignant component is small and it can be resolved with a wider sampling of the tumor, in order to obtain smears from the malignant transformation. Many studies showed similar findings [13-15]. There were 4 cases which were diagnosed as sialadenosis histopathologically. The FNAC slides were reviewed, which showed increased cellularity with epithelial components and fibrocollagenous tissue, which were mistaken as chondromyxoid stromal fragments. Warthin’s Tumor (WT) WT is the second most common benign salivary gland tumor (5-6%) and a majority of these can occur in the parotid or periparotid area. These tumors are bilateral in 5-6% of the cases, they may be multiple and may occur in the older aged groups, and with the striking sex difference that 85-90% of the cases occurs in males. A combination of oncocytes, lymphoid tissues and cystic macrophages help in the diagnosis. Among the 120 cases in the present study, 2 cases were diagnosed as WT by FNAC. Both of these were not available for histopathological correlation. Salivary Cysts Small cysts (mucoceles or mucus retention cysts) which arise from minor salivary glands are not uncommon. The favored sites are in the submucosa of the oral cavity of the lower lip, the cheeks, the dorsal surface of the tip of the tongue and the floor of the mouth. The cysts in the salivary gland can occur in some neoplasm like PA, WT, MEC, acinic cell carcinomas and squamous cell carcinomas. In the present study, out of the 120 cases, there were 4 cases of cysts, which were diagnosed by FNAC. All the 4 cases were available for histopathological correlation. Two were concordantly diagnosed as mucocele and the other 2 as benign lymphoepithelial cysts. The FNAC slides were reviewed, which showed plenty of cyst macrophages and degenerated epithelial cells against a myxoid background. There were no lymphoid components in the smear. This may be due to a sampling error where the needle might have hit only the cystic area. Mucoepidermoid Carcinoma MECs comprise 5-10% of all the salivary gland tumors and 9/10th of these tumors occur in the parotid gland (15). Zajicek et al. reported a DA of 37% when all the 3 cellular components (epidermoid cells, intermediate cells and mucous cells) were present. Cellular smears from well differentiated MECs usually pose no problem in their diagnosis. However, the high grade, poorly differentiated tumors may be difficult to recognize as MECs and they may be misdiagnosed as poorly differentiated squamous cell carcinomas. When the tumor is cystic and the aspiration yields only mucous material, a diagnosis of MEC may be missed. In our study, out of 120 cases, there were 6 cases of MEC, which were diagnosed by FNAC. The smear showed 3 types of cells, epidermoid cells, intermediate cells and mucus cells against a dirty necrotic background. Two cases were available for histopathological correlation, which were concordantly diagnosed. Acinic Cell Carcinoma (ACC) ACCs comprise 1% of the salivary gland tumors and 95% of them occur in the parotid glands, accounting for about 2.5-4% of all the parotid tumors. Among the 120 cases in the present study, 2 cases of ACCs were reported cytologically in a 60 year old male and another was reported in a 52 year old female, both presenting with hard parotid masses. The patients were not available for further follow up since they were referred to higher centers for further management. Carcinoma ex pleomorphic adenoma (CA ex PA) and malignant mixed tumor The incidence of CA ex PA is 1.5-6.5%. Among the 120 cases in the present study, 4 were diagnosed as CA ex PA cytologically. The smears which were studied showed epithelial cell clusters which revealed a prominent nuclear enlargement and atypia with clusters of benign epithelial cells and myxoid stroma.

One case was available for histopathological correlation, which was concordantly diagnosed as MEC. Primary lymphoma of the salivary gland: Lymphoma of the salivary gland accounts for 5% of the cases of extra nodal lymphomas and 10% of all the malignant salivary gland tumors (16). A majority of the salivary gland lymphomas (70- 80%) arise in the parotid gland and most of them are low-grade non-Hodgkin’s lymphomas. Among the 120 cases in the present study, two cases (48 and 64 year old male patients) were diagnosed as primary lymphomas cytologically, who presented with the bilateral enlargement of the parotid glands. There was no associated lymphadenopathy or organomegaly. Both the cases were concordantly diagnosed by biopsy as high grade non-Hodgkin’s lymphomas (Diffuse large B cell lymphomas) and were referred to higher centers for further management. Metastatic Deposits Metastatic carcinoma and melanoma may involve either the salivary glands or the lymph nodes which are adjacent or within the gland. The commonest primary tumor is cutaneous squamous cell carcinoma of the head and neck. Among the 120 cases in the present study, two cases of squamous cell carcinoma metastatic deposits were diagnosed cytologically in 2 60 and 75 year old male patients with a history of bilateral submandibular gland enlargement. Both presented with hoarseness of the voice and direct laryngoscopy revealed ulceroproliferative growths in their vocal cords. The smears showed pleomorphic squamous epithelial cells in clusters and singles, tadpole cells and keratin pearls against a dirty background. Both the patients were referred to higher centers for further management and hence a histopathological correlation was not possible. The malignant tumors spread by the direct and the haematogenous routes. Interestingly, 20% of the parotid glands, 34% of the submandibular glands and 14% of the minor salivary glands will have cervical lymph node metastases at presentation, especially due to high grade MEC (39%) and malignant mixed tumors (32%). In our study, benign tumors were more common than malignant tumors, which was similar to the findings in all other studies (12), (13), (14). The parotid gland was very commonly involved, whereas PA and MEC were the commonest benign and malignant tumor respectively, which was similar to that which was found in other studies (14), (15). The diagnostic accuracy (DA) was 92%, the sensitivity was 97% and the specificity 80%, which were similar to that which was seen in other studies (13), (14), and (15).

CONCLUSION
FNAC offers valuable information which is not obtained by any other means. FNAC of the salivary gland tumors is advantageous for both the patients and the clinicians because of its immediate results, accuracy, economy, and lack of complications. Although FNAC of the salivary gland tumors has a high diagnostic accuracy (92% in the present study), it can further be improved by a wider sampling and ultrasound guided aspirations. Awareness of the therapeutic implications and limitations of the cytological interpretation amongst both the clinicians and the cytopathologists should enable FNAC to its best advantage.

ACKNOWLEDGMENT
We acknowledge the immense help received from the scholars whose articles are cited and included in references of this manuscript. We are also grateful to authors / editors /publishers of all those articles, journals and books from where the literature for this article has been reviewed and discussed.

References:

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16. Agale SV, D’Costa GF, Hastak MS, Shedge RT. Primary non-Hodgkin’s lymphoma of the salivary gland: A spectrum of lymphoepithelial sialadenitis and low-grade Bcell lymphoma of the mucosa-associated lymphoid tissue with transformation to highgrade lymphoma. Indian J Pathol Microbiol 2010; 53:364-67.

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A Study by Mohita Ray et al. entitled "Accuracy of Intra-Operative Frozen Section Consultation of Gastrointestinal Biopsy Samples in Correlation with the Final Histopathological Diagnosis" is awarded Best Article for Vol 13 issue 01
A Study by Badritdinova MN et al. entitled "Peculiarities of a Pain in Patients with Ischemic Heart Disease in the Presence of Individual Combines of the Metabolic Syndrome" is awarded Best Article for Vol 12 issue 24
A Study by Sindhu Priya E S et al. entitled "Neuroprotective activity of Pyrazolone Derivatives Against Paraquat-induced Oxidative Stress and Locomotor Impairment in Drosophila melanogaster" is awarded Best Article for Vol 12 issue 23
A Study by Habiba Suhail et al. entitled "Effect of Majoon Murmakki in Dysmenorrhoea (Usre Tams): A Standard Controlled Clinical Study" is awarded Best Article for Vol 12 issue 22
A Study by Ghaffar UB et al. entitled "Correlation between Height and Foot Length in Saudi Population in Majmaah, Saudi Arabia" is awarded Best Article for Vol 12 issue 21
A Study by Siti Sarah Binti Maidin entitled "Sleep Well: Mobile Application to Address Sleeping Problems" is awarded Best Article for Vol 12 issue 20
A Study by Avijit Singh"Comparison of Post Operative Clinical Outcomes Between “Made in India” TTK Chitra Mechanical Heart Valve Versus St Jude Mechanical Heart Valve in Valve Replacement Surgery" is awarded Best Article for Vol 12 issue 19
A Study by Sonali Banerjee and Mary Mathews N. entitled "Exploring Quality of Life and Perceived Experiences Among Couples Undergoing Fertility Treatment in Western India: A Mixed Methodology" is awarded Best Article for Vol 12 issue 18
A Study by Jabbar Desai et al. entitled "Prevalence of Obstructive Airway Disease in Patients with Ischemic Heart Disease and Hypertension" is awarded Best Article for Vol 12 issue 17
A Study by Juna Byun et al. entitled "Study on Difference in Coronavirus-19 Related Anxiety between Face-to-face and Non-face-to-face Classes among University Students in South Korea" is awarded Best Article for Vol 12 issue 16
A Study by Sudha Ramachandra & Vinay Chavan entitled "Enhanced-Hybrid-Age Layered Population Structure (E-Hybrid-ALPS): A Genetic Algorithm with Adaptive Crossover for Molecular Docking Studies of Drug Discovery Process" is awarded Best article for Vol 12 issue 15
A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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