SESSION TITLE: Student/Resident Chest Infections SESSION TYPE: Student/Resident Case Report Slide PRESENTED ON: Monday, October 30, 2017 at 11:00 AM - 12:00 PM INTRODUCTION: Caverno-cutaneous fistula is a pathological communication between lung cavity and skin which usually develops following a thoracic surgery, trauma or may complicate pulmonary abscess/ infarction. Development of spontaneous caverno-cutaneous fistula in cavitary pulmonary tuberculosis is an extremely rare phenomenon. Extensive literature review revealed only six such case reports. Further, five of those were associated with lung herniation. We describe herewith a case of spontaneously ruptured caverno-cutaneous fistula in a 55-year-old immunocompetent female without lung herniation or pleural spillage. This is only the second patient with such a presentation CASE PRESENTATION: A 55-year-old female presented to us with fever, productive cough and a right-sided parasternal discharging sinus. Initially there was a swelling which ruptured spontaneously with leakage of pus and air. There was no past history of tuberculosis, chest-trauma or surgery. Examination revealed a 3x2cm right sided parasternal ulcer with undermined edges. There were bronchial breath-sounds with crepitations. Chest radiograph demonstrated right sided fibro-cavitary disease. The Sinogram (Fig 1) and contrast-enhanced CT-thorax were performed post dye injection into the sinus which demonstrated movement of dye towards the cavity in right upper lobe. The patient also coughed out the dye (Fig 2). The sputum-smear and culture was positive for acid-fast-bacilli. Hence the diagnosis of tubercular caverno-cutaneous fistula was made. Patient was put on anti-tubercular drugs and referred for surgical excision. She had good clinical response following treatment. DISCUSSION: The fistulae are rare complications of tuberculosis. These are poorly described in the medical literature with the mechanism not yet clear. Pleuro-cutaneous fistulae are thought to be secondary to tuberculous adenitis with thoracic extension while caverno-cutaneous fistulae are thought to be result of rupture of a tension cavity. The rupture may not be associated with pyopneumothorax because of pleural symphysis. Lung herniation may be present. Diagnosis is suggested by location of the sinus, leakage of air and presence of cough impulse. CT thorax is helpful with diagnosis confirmed by bronchogram, sinogram or percutaneous fibreoptic-bronchoscopy. The sinogram with methylene-blue dye, helps tracking the sinus tract to its origin, and may help the surgeon in dissection of infected tissue. Differentials include pyogenic infections, actinomycosis, trauma and malignancy. Prognosis is good with management usually surgical and medical with anti-tubercular treatment. Bronchoscopic closure with glues, sealants is needed if patient is unfit for surgery. CONCLUSIONS: The caverno-cutaneous fistula is an extremely rare complication of tuberculosis. The diagnosis requires sinogram and should be suspected if a patient presents with discharging sinus on the chest wall. Reference #1: Caverno-cutaneous fistula: A rare entity. Lung India.2016;33:474-5 DISCLOSURE: The following authors have nothing to disclose: Sumit Mehra, Rajiv Garg No Product/Research Disclosure Information
Read full abstract