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Tropical/Infectoparasitary Dermatology • An. Bras. Dermatol. 96 (1) • Jan-Feb 2021 • https://doi.org/10.1016/j.abd.2020.01.009   copy

Diagnosis of cutaneous tuberculosis (lymph node scrofuloderma) using the Xpert MTB/RIF® method☆ ☆ How to cite this article: Costa LL, Veasey JV. Diagnosis of cutaneous tuberculosis (lymph node scrofuloderma) using the Xpert MTB/RIF® method. An Bras Dermatol. 2021;96:82-84. ,☆☆ ☆☆ Study conducted at the Dermatology Clinic, Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil

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Abstract

Cutaneous tuberculosis is a rare infection that is difficult to diagnose, because it shows less sensitivity and specificity in classic complementary exams when compared with the pulmonary form. The Xpert MTB/RIF® method offers an early diagnosis that identifies the DNA of Mycobacterium tuberculosis and the main mutations that give the bacterium resistance to rifampicin. The authors present a case of scrofuloderma whose diagnosis was quickly obtained through the secretion of a cervical lesion, allowing an early diagnosis and the initiation of appropriate treatment.

KEYWORDS
Diagnosis; Diagnostic tools; Mycobacterium tuberculosis; Polymerase chain reaction; Rifampicin; Tuberculosis, cutaneous

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