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Ruptured pulmonary hydatid cyst


 Department of Pulmonary Medicine and Critical Care, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India

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Date of Submission04-Jul-2022
Date of Acceptance12-Aug-2022
Date of Web Publication15-Nov-2022
 

   Abstract 


A 37-year-old male presented with left-sided hydropneumothorax. After drainage of fluid and air from the pleural cavity, chest radiograph and computed tomography of chest showed characteristic radiological image of ruptured hydatid cyst. The diagnosis was supported by positive echinococcal serology.

Keywords: Hydatid cyst, ruptured hydatid cyst, water-lily sign


How to cite this URL:
Datta A, Goud SM, Mohapatra PR. Ruptured pulmonary hydatid cyst. J Global Infect Dis [Epub ahead of print] [cited 2022 Nov 28]. Available from: https://www.jgid.org/preprintarticle.asp?id=361146





   Case Report Top


A 37-year-old nonsmoker man without any known comorbidity presented with complaints of dull aching pain on the left side of the chest for 2 months and dry cough associated with shortness of breath for 7 days. He was a villager and a farmer by occupation. Respiratory system examination revealed an air–fluid level in the left hemithorax indicated by the presence of shifting dullness and succession splash. The chest radiograph confirmed the presence of hydropneumothorax on the left side. Intercostal tube drainage was done. The complete hemogram showed mild leukocytosis with an absolute eosinophil count of 980/μl. The metabolic panel, including renal and liver function tests, was normal. Pleural fluid was serous, exudative, and eosinophilic with adenosine deaminase of 23 units/L. Repeat chest X-ray revealed a cavity in the left mid and lower zone containing a crumpled membrane-like structure that seemed to float at a fluid level [Figure 1]. Computed tomography of the chest showed a cystic lesion in the left lower lobe with a wavy membranous structure floating in the air–fluid interface, suggesting collapsed endocyst. This is named as water-lily or camolette sign [Figure 2]. This is one of the characteristic radiological signs of a ruptured hydatid cyst. In a serological study, enzyme-linked immunosorbent assay (ELISA) detecting immunoglobulin G (IgG) against antigen B was positive. The patient underwent cystotomy plus capitonnage along with decortication. He was put on oral albendazole therapy at a dose of 400 mg twice daily.
Figure 1: Chest X-ray image showing a cavity containing crumpled membranous structure floating at air–fluid interface. Furthermore, residual pneumothorax is present on the left side with intercostal drainage tube in situ

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Figure 2: Axial image of CT chest showing water-lily or camolette sign. A cystic lesion is present in the left lower lobe with collapsed endocyst floating in the air–fluid interface as wrinkled membranes. CT: Computed tomography

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   Discussion Top


Hydatid cyst or echinococcosis is a zoonotic disease caused due to infestation by the larval form of the parasite Echinococcus. Humans are the accidental host as they get infected by ingesting contaminated water or vegetables. The lung is the second-most common organ involved, following the liver. Cysts are usually detected incidentally as they are slow growing. Larger cysts cause compressive symptoms such as chest pain, dry cough, and dyspnea. Sudden-onset dyspnea, cough, severe chest pain, fever, and anaphylactic reactions may indicate cyst rupture.[1] In our case, the cyst might be present for a longer time, but the rupture was suggested by acute-onset dry cough and dyspnea. The rupture of a cyst may be partial or complete. Following complete rupture, a cyst may communicate with bronchus or pleural cavity, leading to partially or fully emptying its content. Pleural rupture leads to the development of hydrothorax or hydropneumothorax. In rare instances, acute pulmonary embolism has been described after rupturing of the cyst. Imaging characteristics aided by serological tests usually make the diagnosis. Various characteristic radiological signs have been described in the context of a ruptured cyst [Table 1].[2],[3] ELISA and indirect hemagglutination tests are the most commonly applied methods for detecting anti-Echinococcus antibodies. It is reported that echinococcal IgG ELISA is the most sensitive test for the detection of hydatidosis.[4] The differential diagnoses usually include lung abscess, cavitary tuberculosis, infected benign cysts, and cavitating neoplasms. In these conditions, rupture into the pleural cavity may also lead to hydropneumothorax or pyopneumothorax. Surgical removal of the cyst is the treatment of choice for the ruptured cyst. The operative intervention should be applied soon after the diagnosis is confirmed. The surgical interventions usually target either removal of the content of pericyst or complete cyst excision with an aim to preserve the lung parenchyma. The conservative surgical approach is cystotomy with capitonnage. The posterolateral or lateral thoracotomy approach is used to remove endocyst and other remnants.[5] Albendazole therapy should be considered postoperatively for 6 months to prevent a recurrence. The usual dose is 15 mg/kg daily in two divided doses along with a fatty meal.[6] Since rupture of pulmonary hydatid cyst is seen in up to 90% of cases, the clinicians must be aware of such presentation and management of the pulmonary hydatid disease.
Table 1: Various radiological signs of ruptured pulmonary hydatid cyst

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Declaration of patient consent

The authors certify that they have obtained appropriate patient consent form. In the form, the patient has given his consent for his images and other clinical information to be reported in the journal. The patient understands that his name and initials will not be published and due efforts will be made to conceal his identity, but anonymity cannot be guaranteed.

Research quality and ethics statement

The authors followed applicable EQUATOR Network guidelines, notably the CARE guideline, during the conduct of this report.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
   References Top

1.
Rawat S, Kumar R, Raja J, Singh RS, Thingnam SK. Pulmonary hydatid cyst: Review of literature. J Family Med Prim Care 2019;8:2774-8.  Back to cited text no. 1
[PUBMED]  [Full text]  
2.
Garg MK, Sharma M, Gulati A, Gorsi U, Aggarwal AN, Agarwal R, et al. Imaging in pulmonary hydatid cysts. World J Radiol 2016;8:581-7.  Back to cited text no. 2
    
3.
Durhan G, Tan AA, Düzgün SA, Akkaya S, Arıyürek OM. Radiological manifestations of thoracic hydatid cysts: Pulmonary and extrapulmonary findings. Insights Imaging 2020;11:116.  Back to cited text no. 3
    
4.
Aydin Y, Altuntas B, Kaya A, Ulas AB, Uyanık MH, Eroglu A. The availability of echinococcus igg elisa for diagnosing pulmonary hydatid cysts. Eurasian J Med 2018;50:144-7.  Back to cited text no. 4
    
5.
Aldahmashi M, Alassal M, Kasb I, Elrakhawy H. Conservative surgical management for pulmonary hydatid cyst: analysis and outcome of 148 cases. Can Respir J 2016;2016:1-6.  Back to cited text no. 5
    
6.
Aydin Y, Ulas AB, Ince I, Kalin A, Can FK, Gundogdu B, et al. Evaluation of albendazole efficiency and complications in patients with pulmonary hydatid cyst. Interact Cardiovasc Thorac Surg 2022;34:245-9.  Back to cited text no. 6
    

Top
Correspondence Address:
Prasanta Raghab Mohapatra,
Room No. 144, OPD Block, Department of Pulmonary Medicine and Critical Care, All India Institute of Medical Sciences, Bhubaneswar, Odisha
India
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jgid.jgid_137_22



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2008 Journal of Global Infectious Diseases | Published by Wolters Kluwer - Medknow
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