Diagnostic challenges of longstanding nasal cutaneous tuberculosis in an endemic setting: a case report.

Nasal cutaneous tuberculosis (TB) is a rare manifestation of extrapulmonary tuberculosis and presents a diagnostic challenge, particularly in its paucibacillary form. As demonstrated in this case, achieving laboratory-confirmed diagnosis in paucibacillary TB remains a significant challenge, often resulting in missed or delayed diagnoses and increased severity of disease on presentation. We report an atypical case involving a 19-year-old male with extensive nasal destruction progressing for fourteen years. In this case, lupus vulgaris was ultimately diagnosed after extending the tissue culture duration beyond 35 days, despite prior exclusion of TB as the cause. The patient completed antituberculosis therapy with resolution of the active disease, and he was referred for further management of his facial deformity. The delayed diagnosis led to significant tissue destruction, which could have been prevented with earlier confirmation and treatment of the infection. We propose that, in diagnostically difficult cases, the investigating team consider extending the specimen culture time to the maximum before definitively excluding tuberculous disease.