A histomorphological study of lesions of tonsil in tertiary care hospital

Introduction: Palatine tonsils are paired masses of lymphoid tissue which act as immunologic barrier against the entry of pathogenic agents into the respiratory and digestive tracts. Despite their protective function, tonsils are prone to infection. Tonsillitis is a common disease especially among the children. Chronic tonsillitis is a disease with repeated attacks of acute tonsillitis or a sub-clinic form of a resistant or poorly treated infection. Aim: To study the histomorphological findings of various lesions of tonsils. Materials and Methods: A cross sectional study was carried out at a department of pathology in a tertiary care hospital for a period of two years. A total 160 cases of the histomorphologically identified tonsillectomy specimens were included and stained by Hematoxylin & Eosin . Results: We studied histopathology of 160 cases, out of which 156 were tonsillectomy specimens, 4 were tonsillar biopsies. The age of patients ranged from 1 to 60 years. In our study the histomorphological diagnosis showed 45(28.1%) cases showed chronic tonsillitis, 62(38.7%) cases of follicular tonsillitis, 5(3.2%) cases of chronic tonsillitis showed actinomycotic colonies, with no tissue reaction, 2(1.2%) cases of acute on chronic tonsillitis, and 40(25%) cases of reactive lymphoid hyperplasia and 5(3.2%) cases of Acute suppurative tonsillitis 1(0.6%) cases and 1(0.6%) case of moderately differentiated squamous cell carcinoma were seen. Conclusion: Routine histomorphogical study of tonsillectomy specimens has a low cost-benefit rate, and most diagnostic tool for early screening and follow-up of malignancy. © 2020 Published by Innovative Publication. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by/4.0/)


Introduction
Tonsillar diseases are the most common encountered healthrelated issues in ear, nose and throat (ENT) diseases in children and adults. 1 Waldeyer's ring is a lymphatic aggregate located at the wall of pharynx. It consists of six elements according to their site: palatine, lingual, nasopharyngeal (adenoids) and tubal tonsils, in addition to lateral pharyngeal bands and lymphatic aggregates at posterior pharyngeal wall. The definitive function of Waldeyer's ring is unknown but it is thought to have important role in the body's immune system where coming antigens may be aspirated or ingested. 2 The palatine tonsils are two ovoid masses of lymphoid tissue situated on either side of the oropharynx. They are coated by non-keratinized stratified squamous epithelium as an extension of the oropharyngeal mucosa, including 15 deep crypts that invaginate into the parenchyma, in which B -lymphocyte are found. 2 Tonsillitis is one of the commonest infectious diseases seen commonly in the young age group. The purpose of the study was histomorphological findings of various lesions of tonsil in a tertiary care hospital.

Materials and Methods
This is a cross-sectional study carried out at the Department of Pathology, JJM medical college from January 2017 to December 2018. A total of 160 cases received, out of which 156 were tonsillectomy specimens, 4 were tonsillar biopsies and were evaluated. All the patient with excised tonsillectomy and tonsillar biopsy specimens were included and patient taking treatment for primary neoplasm in tonsil were excluded. Patients age, sex, duration and complete clinical examination were noted from case sheet. The tonsillectomy specimens were fixed in 10% buffered formalin, 3 to 5 microns thick sections were made from formalin fixed, paraffin-embedded blocks and stained with H&E and examined under microscope.

Results
A total of 160 cases were studied with 86(53.75%) male and 74(46.25%) female patients with age ranged from 5 to 60 years with a mean age of 20.2 years. The majority of cases falling in the range between 10-20 years (110 cases, 68.75%), followed by 20-30 years (30 cases, 18.75%) and 5 cases (6.25%) in the range of 0-6 years. The most common clinical presentation was recurrent intermittent episodes of throat pain, recurrent tonsillitis associated with hypertrophy of tonsil and tonsillar mass or ulcer (Table 1).
Two (1.2%) cases of acute on chronic tonsillitis, and 40(25%) cases of reactive lymphoid hyperplasia and 5(3.2%) cases of Acute suppurative tonsillitis were seen. Malignancy was observed in 1(0.6%) cases and diagnosed as moderately differentiated squamous cell carcinoma.

Discussion
Palatine and nasopharyngeal tonsils are the lymphatic clusters of the respiratory and digestive tract epithelium. The tonsils are enclosed by fibrous and dense capsule, separating them from a deeper connectivetissue. 5,6 Tonsils arises from the second pair of pharyngeal pouches, where endoderm bears the covering epithelium and mesenchymal structure giving origin to the lymphoid tissue. 7 In younger age group recurrent and chronic tonsillitis is very common. Malignancy of tonsils is also not very uncommon.
Recurrent and chronic tonsillitis leads to hyperplasia of the tissue and the treatment given is surgical removal of tonsils, but there is little information about the histopathological findings in a tonsillectomy specimen both in the textbooks and in the literature. 8 Chronic tonsillitis most often affects children, but can be seen in adults, probably due to a local dysfunction of the epithelium.
The recurrent chances of acute tonsillitis is attributed due to the bacteria survived intracellularly, thus evading antibiotic killing and causing re-infection.
Repeated attacks of tonsillitis can lead to tonsillar hypertrophy causing airway obstruction, thus leading to excision. Many studies stated that though chronic inflammation is present in both tonsillitis and tonsillar hypertrophy, it is more marked in tonsillitis patients. Fibrosis can only be seen in cases of tonsillitis. However, high bacterial load and elevation of immunologically active cell population in the tonsils are observed in both groups of patients. 9  Tonsillectomy is the most commonly performed surgical procedure in pediatric patients. The ages of the patients in this study coincide with the age group where hypertrophy and tonsillitis are more intense and frequent. 10,11 In our study patients' age group ranged from 5 -60years, majority of the patients (68.75%) were less than 20 years of age. However one patients with tonsillar malignancy were of higher age group. Among 160 cases, a slight predominance of male (53.75%) over female (46.25%) was observed. The majority of the cases were children (94%) presenting recurrent tonsillitis due to hypertrophy of palatopharyngeal tonsils (66,8%), which is in accordance with the literature worldwide, which may be consistent, with microorganisms growth could stimulate proliferation of lymphoid elements. 12 In our study histological diagnoses were chronic tonsillitis in 45(28.1%), follicular tonsillitis in 62(38.7%), chronic suppurative tonsillitis (quinsy) in 5(3.2%), Chronic tonsillitis showed actinomycotic colonies in 5(3.2%), lymphoid hyperplasia in 40(25%) and scc in 1(0.6%) respectively. This is similar to the findings of Ikram M et al. 13  were more closely associated with chronic tonsillitis, only one criteria (the presence of lymphoid hyperplasia) was foremost in chronic tonsillar hypertrophy compared with chronic tonsillitis. In our study the presence of mildmoderate lymphocyte infiltration in the surface epithelium seen in 102(88.1%) cases, the presence of Ugras's abscess and/or diffuse lymphocyte infiltration leading to the defect in the surface epithelium was seen in 90(77.2%) cases, increase in the plasma cells number in the subepithelial area and in the interfollicular area in 65 cases (58.5%), the presence of polymorphonuclear leukocytes in the surface epithelium and in the subepithelial area in 32 cases (26%), the presence of lymphoid hyperplasia in 01 cases (0.75%), the presence of fibrosis in 03 cases (3.2%) and the presence of atrophy was present in 01cases(0.75%). Actinomycetes are filamentous bacteria and present as oral cavity commensal organisms. When present in the tonsils, they are associated with recurrent tonsillitis along with complaints of sore throat, fever. Human actinomycosis is mainly caused by A.israelii. 15 Van Lierop et al 16 found no tissue reaction due to actinomyces colonies and hence reported no correlation between tonsillar actinomycosis and recurrent tonsillitis. In our study, five cases of chronic tonsillitis showed actinomycotic colonies, without tissue reaction.
Carcinoma arising from tonsils are usually is squamous in origin and is related strongly to smoking, HPV infection and, to a lesser degree, alcohol ingestion. 17 However, during the past 2 decades, numerous studies have shown that human papillomaviruses (HPV) are a risk factor for the development of oropharyngeal carcinoma. 18 Squamous cell carcinoma (SCC) is the most common malignancy followed by Non-Hodgkin's lymphomas (NHL) in the tonsil. In our study, we observed one case of SCC which correlates Babu et al 19 reported a total of 5 cases of tonsillar malignancy which includes two undifferentiated carcinomas, two NHLs, and one SCC.

Conclusion
In conclusion, chronic tonsillitis is the most common lesion diagnosed in tonsil. However the histomorphology play important role of in evaluation of a patient with chronic tonsillitis for earlier surgical intervention and hence reduction in associated morbidity.

Source of funding
None.

Conflict of Interest
None.