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Mantoux test. In immunocompromised 5mm or greater is considered positive (not able to pound as positive a reaction)

Q) A young lady presented with bilateral nodular lesions on shins. She was also found to have bilateral hilar lymphadenopathy on chest X-ray. Mantoux test reveals indurations of 5 mms. Which of the following change can be noted on her skin biopsy when done? A. Noncaseating Granuloma B. Vasculitis C. Caseating Granuloma D. Malignant cells Answer A. Noncaseating Granuloma his patient’s skin lesions which is most likely erythema nodosum along with negative mantoux test and chest X ray find

PPD skin test or mantoux test - http://www.esupermommy.com/2012/02/what-is-ppd-skin-test-in-children/