Home About us Editorial board Ahead of print Current issue Search Archives Submit article Instructions Subscribe Contacts Login 
  • Users Online: 5889
  • Home
  • Print this page
  • Email this page

   Table of Contents      
LETTER TO THE EDITOR
Year : 2016  |  Volume : 64  |  Issue : 7  |  Page : 548-549

Approach to tubercular disc edema


1 Guru Nanak Eye Centre, New Delhi, India
2 Department of Radiodiagnosis, Maulana Azad Medical College, New Delhi, India
3 Department of Medicine, All India Institute of Medical Sciences, New Delhi, India

Date of Web Publication9-Sep-2016

Correspondence Address:
Gauri Bhushan
B-3/75-B, Lawrence Road, New Delhi - 110 035
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0301-4738.190176

Rights and Permissions

How to cite this article:
Bhushan G, Gupta S, Gupta S, Nischal N. Approach to tubercular disc edema. Indian J Ophthalmol 2016;64:548-9

How to cite this URL:
Bhushan G, Gupta S, Gupta S, Nischal N. Approach to tubercular disc edema. Indian J Ophthalmol [serial online] 2016 [cited 2020 Feb 28];64:548-9. Available from: http://www.ijo.in/text.asp?2016/64/7/548/190176

Sir,

We read with interest, the brief communication entitled, "A case of subretinal tubercular abscess presenting as disc edema" by Shetty et al. [1] After going through the article, we would like to highlight certain points in the management of disc edema, especially in an Indian setting.

Tuberculosis (TB) is a great masquerade and can affect virtually any part of human body. Ocular TB, which can involve any segment of the eye, develops either from direct invasion by bacteria or from hypersensitivity reaction. Tuberculous optic neuropathy can manifest as papillitis, neuroretinitis, or optic nerve tubercle; of this, the most common manifestation is papillitis. [2] Diagnosing extrapulmonary TB like ocular TB is a challenge due to difficulty in obtaining specimen for tests; hence, high index of suspicion is important in some appropriate clinical settings. TB should be considered as an important differential in an immunocompetent patient with optic neuritis even if he is asymptomatic otherwise. [3]

In a young male presenting with gradual, painful diminution of vision over 25 days, the authors considered idiopathic optic neuritis as the probable diagnosis and administered intravenous methylprednisolone. However, in cases of disc edema, infectious, noninfectious, and autoimmune conditions such as neuroretinitis, multiple sclerosis (MS), diabetes, neoplasia, sarcoidosis, systemic lupus erythematosus, and rheumatoid arthritis should be kept in mind, and once we are sure of their absence, it should be labeled idiopathic.

In the case described in this article, magnetic resonance imaging (MRI) brain and orbit as baseline investigation for the optic neuritis would have been appropriate. At T2-weighted MRI, acute optic neuritis manifests as hyperintense signal in enlarged, enhancing optic nerve whereas chronic optic neuritis manifests as hypeintense signal in an atrophic, nonenhancing optic nerve. [4] It would not only have ruled out conditions such as MS (an important differential) but also have given an idea about possible tubercular involvement of optic nerve as well as brain.

Lifetime risk of developing active TB in latent TB (LTB) ranges from 5% to 10%. [5] However, this risk increases manifold in those who become immunosuppressed. Steroid, which suppresses immunity, is known to cause flaring of the underlying TB infection and can lead to widespread dissemination. Hence, it is wise to seek actively, underlying TB infection before starting any immunosuppressant. Steroid should be started in a patient with disc edema only after ruling out active TB infection. A careful history for past tubercular infection or contact with a TB patient should be taken. History of malaise, weight loss, cough, or fever may point toward an underlying TB infection. History of childhood vaccination for bacillus Calmette-Guérin should be asked for. A good general physical examination may reveal lymph node enlargement, especially in cervical and axillary regions. A routine X-ray chest and ultrasound abdomen may be advised to look for evidence of TB on other sites. If these investigations raise some suspicion, contrast-enhanced computed tomography chest can be used to further characterize the lesion and ascertain disease activity. It is a good idea to involve a physician in the management of such cases.

Erythrocyte sedimentation rate and Mantoux test can be used as corroborative evidence. However, it must be stressed that blood-based ELISA tests (QuantiFERON Gold etc.) are not accurate for diagnosing TB in endemic country like India. Blood polymerase chain reaction tests for TB are unreliable and not recommended by any agency. The use of interferon-gamma release assays (IGRAs) for active TB results in unacceptably high rates of false-positive results because IGRAs cannot separate LTB infection from active TB disease. [6] The WHO urged countries to ban inaccurate and unapproved blood tests and instead rely on accurate microbiological or molecular tests. On June 6, 2012, the Government of India issued a notification banning serological tests. [7] However, it is rampantly used especially in private sector, a practice which needs to be strongly discouraged.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
  References Top

1.
Shetty SB, Bawtag MA, Biswas J. A case of subretinal tubercular abscess presenting as disc edema. Indian J Ophthalmol 2015;63:164-6.  Back to cited text no. 1
[PUBMED]  Medknow Journal  
2.
Gupta V, Gupta A, Rao NA. Intraocular tuberculosis - An update. Surv Ophthalmol 2007;52:561-87.  Back to cited text no. 2
[PUBMED]    
3.
Mansour AM, Tabbara KF, Tabbarah Z. Isolated optic disc tuberculosis. Case Rep Ophthalmol 2015;6:317-20.  Back to cited text no. 3
[PUBMED]    
4.
Mafee MF. Orbit: Embroyology, antomy and pathology. In: Som PM, Curtin HD, editors. Head and Neck Imaging. 4 th ed. St. Louis, Mo: Mosby; 2003. p. 529-654.  Back to cited text no. 4
    
5.
Gupta KB. Challenges in diagnosis and treatment of latent tuberculosis infection; editorial. Indian J Tuberc 2012;59:1-5.  Back to cited text no. 5
[PUBMED]    
6.
World Health Organization. Policy statement: Commercial serodiagnostic tests for diagnosis of tuberculosis. Geneva: World Health Organization; 2011.  Back to cited text no. 6
    
7.
Pai M. Promoting Affordable and Quality Tuberculosis Testing in India. J Lab Physicians 2013;5:1-4.  Back to cited text no. 7
[PUBMED]  Medknow Journal  




 

Top
 
 
  Search
 
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

 
  In this article
References

 Article Access Statistics
    Viewed848    
    Printed3    
    Emailed0    
    PDF Downloaded144    
    Comments [Add]    

Recommend this journal