according to individual host factors. (Santos JB et 
al., 2014) This explains the histopathology finding 
that may show marked caseation necrosis and 
abscess material with mixed inflammatory 
infiltrations dominate the center of the lesion. (Santo 
s JB et al., 2014.Besides, a presence of characteristic 
tubercular granulomas with epithelioid cells in the 
dermis is observed in 57%–96% of the samples. 
(Rahman et al., 2018) showed only 16.7% cases 
whereas granuloma with caseous necrosis found in 
the dermis. On the other hand, 55.6% the majority of 
the cases showed granuloma without caseous 
necrosis.
12
Although not typical, a histopathological 
examination from skin showed the presence of 
epithelioid cell granulomas with a variable number 
of Langhans giant cell and lymphocytes infiltrates in 
the dermis.  Central caseation necrosis was found 
from FNAB, therefore support the diagnosis of 
tuberculosis lymphadenitis. Some acid-fast bacilli 
can be found (Ho SCK, 2003). This patient’s 
bacteriological examination showed no acid-fast 
bacilli. This is in line with the literature which stated 
that bacteriological examination did not always find 
acid-fast bacilli although a higher bacterial load. (Ho 
SCK, 2003). Mycobacterial culture is the gold 
standard for determining the presence of active TB 
infection. (Ho SCK, 2003). However it is not always 
possible to obtain a positive result. Positivity is 
lower in an exclusively cutaneous presentation, that 
is around 23% (Santos JB et al., 2014; Frankel A et 
al., 2009).Polymerase chain reaction is used 
primarily as a complement to clinicopathological 
evaluation. It was reported in another study that one 
out of three scrofuloderma patients had a positive 
PCR finding(Santos JB et al., 2014;Tan WP et al., 
2007). Positive PCR result is not always obtained. In 
the diagnosis of cutaneous TB, the sensitivity and 
specificity of PCR vary greatly from literature. 
Detection of Mycobacterium tuberculosisby a PCR 
in this patient turned out to be negative. 
A diagnosis of tuberculous lymphadenitis with a 
cutaneous extension (scrofuloderma) has been 
made.It was confirmed by history taking, clinical 
features, a positive result on IGRA, Xpert MTB/RIF, 
and histopathological findings. The patient was 
quickly started on an anti-tubercular treatment 
regimen that included isoniazid, rifampicin, 
ethambutol, and pyrazinamide. The cutaneous lesion 
regressed, and the ulcer starts healing. 
 
4  CONCLUSION 
 
In this patient, scrofuloderma occurs as a result of 
extension from underlying tuberculous 
lymphadenitis. By proper history taking and 
morphologic features examination, a preliminary 
diagnosis can be made, that must be followed by the 
best methods available. Here our case had shown 
that although mycobacterial culture and PCR test 
failed to yield positive findings, IGRA, Xpert 
MTB/RIF, and histopathological evaluations 
provided the conclusive results. That the patient 
responded well to treatment was another proof of the 
infection. 
 
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