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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