|Year : 2017 | Volume
| Issue : 2 | Page : 29-32
Narrow-band imaging in chronic granulomatous laryngeal tuberculosis
Rakesh Srivastava1, Ashish Chandra Agarwal2, Giorgio Peretti3
1 Sushrut Institute of Plastic Surgery and Super-Specialty Hospital, Lucknow, Uttar Pradesh, India
2 Department of ENT, Dr. Ram Manohar Lohia Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
3 Professor of Otorhinolaryngology at University of Genova's Medical and Postgraduate Schools and the Director of Otorhinolaryngology at Genova's San Martino University Hospital, Italy
|Date of Web Publication||26-Sep-2018|
Dr. Ashish Chandra Agarwal
Department of ENT, Dr. Ram Manohar Lohia Institute of Medical Sciences, Lucknow - 226 010, Uttar Pradesh
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Context: The study analyzes the vascular pattern on narrow-band imaging (NBI) in laryngeal tuberculosis (TB) and its differentiation from premalignant and malignant lesions. Objective: NBI is an optical image enhancement technology using light of 415 nm and 540 nm wavelength. These have different depths of penetration and highlight the mucosa and submucosa. NBI has a proven role in the detection of premalignant and malignant lesions. This study analyzes the vascular pattern on NBI in laryngeal TB and its differentiation from premalignant and malignant lesions. Materials and Methods: A prospective study was done at a tertiary care center on patients presenting with hoarseness, breathing, or swallowing difficulty. An endoscopic examination of the larynx was done, and biopsy was taken on suspicion of a neoplastic lesion. A diagnosis of TB was made in nine patients. These patients were included in the study. NBI examination of the larynx was done to analyze the vascular pattern on the vocal folds. The margin and center of the lesion were analyzed in detail. Results: Two patients had primary laryngeal lesions and seven had laryngeal and lung involvement. History and clinical examination, supportive investigations, and NBI helped in the diagnosis. The intrapapillary capillary loop pattern seen in early premalignant or malignant lesion was not observed in any of the cases on NBI. Conclusion: NBI is not confined to the diagnosis of premalignant or malignant lesions. It is equally useful in ruling out malignancy in suspicious lesions on white-light endoscopy. The latter should be carefully evaluated before transoral surgery.
Keywords: Endoscopy, laryngeal tuberculosis, malignancy, narrow-band imaging
|How to cite this article:|
Srivastava R, Agarwal AC, Peretti G. Narrow-band imaging in chronic granulomatous laryngeal tuberculosis. J Laryngol Voice 2017;7:29-32
| Introduction|| |
Endoscopy has been used as an investigation method in the diagnosis of benign and malignant lesions of the upper aerodigestive tract (UADT) for many years. Conventional white light (WL) has certain limitations in the detection and evaluation of small lesions. Narrow-band imaging (NBI) is a new optical image enhancement technology using light, centered on 415 mm (blue light) and 540 nm (green light), having a high affinity for hemoglobin. Blue light penetrates the mucosal layer, while the green light penetrates deeper layers, thus accentuating the arterioles and venules of the submucosa, leading to a better understanding of the morphology and architecture of the intrapapillary capillary loops (IPCLs). IPCLs are end capillaries with a diameter of seven-to-ten microns and sometimes show the flow of red blood cells on high-definition monitors when visualized on NBI. The IPCLs are situated close to the basement membrane; thus, any inflammatory process or early malignant change affects its morphology.
Muto et al. reported the use of NBI with magnifying endoscopy in the identification and surveillance of superficial squamous cell carcinoma of the UADT. Watanabe et al. reported the use of NBI in the detection of early laryngeal cancers. The diagnostic criterion of malignancy which he followed was the presence of well-demarcated areas with scattered brown spots in the lesion [Figure 1]. The sensitivity and specificity for the diagnosis of malignancy by means of NBI were reported as 91.3% and 91.6%, respectively.
|Figure 1: Appearance of a malignant lesion involving the right side of supraglottis on narrow-band imaging|
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NBI has a proven role in the detection of premalignant and malignant lesions, posttreatment surveillance, detection of unknown primary, and intraoperative tumor mapping to differentiate between benign and malignant lesions of the UADT.,,
The present study was done to analyze the vascular pattern on NBI in laryngeal tuberculosis (TB). The normal vascular pattern of vocal folds consists of capillaries in lamina propria, arterioles, and venules in the deeper layers.
| Materials and Methods|| |
A prospective study was done at the Department of ENT of a tertiary care hospital between January 2015 and December 2016. An ethical clearance was obtained before the initiation of the study. The patients between the age of 18 and 65 years, of Both gender, affected by symptoms such as hoarseness of voice, breathing, or swallowing difficulty after consenting for the study, were assessed with WL endoscopy. Variable findings were noted such as hyperplastic lesion, edema, and ulcers involving the larynx and hypopharynx. Biopsy was taken under topical anesthesia as an outpatient procedure from those suspected of having a neoplastic lesion on endoscopic assessment. TB was diagnosed on histopathological analysis of the specimen from nine patients. NBI examination of the larynx and hypopharynx was done on these patients. The vascular pattern of the lesions was studied based on the descriptive guidelines of the European Laryngological Society (ELS). The ELS committee on endoscopic laryngeal imaging has divided the vascularity into longitudinal and perpendicular vascular pattern. Longitudinal vessels reach the vocal folds from the ventricular folds and show a meandering course on reaching the lateral edge of the vocal folds. The changes in these vessels in various diseases of the larynx are enumerated in [Table 1]. Once the diagnosis of TB was established, the opinion of a pulmonologist was sought and antitubercular treatment was initiated. The patients were followed up initially on a weekly basis and later monthly by WL and NBI endoscopy.
|Table 1: Longitudinal and perpendicular vascular changes of the vocal folds|
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| Results|| |
The mean age of the patients was 45 years. The presenting symptoms were as follows: voice change (n = 6), breathing difficulty (n = 2), and difficulty in swallowing (n = 1). The endoscopic findings were variable among the nine patients: hyperplastic lesion over the vocal folds (n = 4) [Figure 2]; glottis-subglottic edema (n = 2); granulation tissue with ulcer over the vocal folds (n = 2) [Figure 3]; ulcer over the vocal process of arytenoids and interarytenoid regions (n = 3); and ulcers involving right pyriform fossa (n = 1). On NBI, the ulcers appeared brownish scattered lesions not raised from the surface and granulations appeared raised from the surface and were brown or cyan colored. Hyperplastic lesions were cyan colored and had ill-defined margins. On follow-up, reduction in the size of ulcer, granulation tissue, and capillary diameter was observed on examination with NBI.
|Figure 2: Tuberculosis mimicking a malignant lesion over the vocal and ventricular folds as seen on narrow-band imaging|
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|Figure 3: Ulcerative lesion involving the anterior one-third of both vocal folds as seen on narrow-band imaging|
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| Discussion|| |
The use of NBI in the evaluation of malignant lesions has been studied extensively, but its role in the assessment of benign lesion has not been studied much, except for a few studies, namely an article by Lukes et al., laryngeal papillomatosis. The present study was done to analyze the vascular pattern on NBI in laryngeal TB. NBI examination of the premalignant and malignant lesions demonstrates perpendicular vessels branching off vertically from the horizontally running capillaries. The IPCLs are situated close to the basement membrane; thus any inflammatory process or early malignant change affects its morphology.,,, IPCLs are small and on WL endoscopy are seen as red dots, whereas on NBI, they appear as brown dots. In tubercular lesions, the changes are observed mostly in the longitudinal vessels. The capillaries appear thin and elongated at the margin of the lesions. They either end abruptly or change their direction at the margin. From the findings of this study, it can be deduced that an absence of perpendicular vascular changes in tubercular lesions is the most important point of differentiation from premalignant or malignant lesion. WL endoscopic examination of the tubercular lesion might give an impression of malignancy, but observation under NBI helps to differentiate the two. Our study also showed that tubercular lesions lack brown dots and worm-like vascular pattern but have thin-caliber longitudinal vessels. The lesions of the pyriform fossa are painful, and there will be pooling of saliva. Laryngeal TB accounts for <1% of all TB cases. Laryngeal involvement may be primary or secondary to pulmonary TB. Earlier studies showed that TB mainly involves the posterior half of larynx, but recent studies indicate predilection for vocal cords (50%–70%) followed by false cords (40%–50%), epiglottis, aryepiglottic folds, arytenoids, posterior commissure, and subglottis (10%–15%). In our study, two cases with lesions near the anterior commissure and one in pyriform fossa were seen. TB of the larynx and hypopharynx should be suspected in cases presenting with dysphagia and odynophagia mimicking a hypopharyngeal carcinoma. According to Shin et al., laryngeal TB may be categorized into four groups: (a) whitish ulcerative lesions, (b) nonspecific inflammatory lesions, (c) polypoid lesions, and (d) ulcerofungative mass lesions. In the present study, two participants presented with ulcerative lesion on true and false cords. The possibility of TB should be considered when a bilateral and diffuse laryngeal lesion is seen without destruction of the laryngeal architecture.
| Conclusion|| |
Granulomatous lesions create a clinical diagnostic dilemma in differentiating from premalignant or malignant lesions of the larynx on WL endoscopy. NBI is a useful tool in such cases. Few studies have been done to evaluate the role of NBI in benign laryngeal disease. NBI examination allows the physician to think differently in terms of other benign inflammatory diseases while assessing a patient with suspected laryngopharyngeal malignancy.
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Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]