Complex Disseminated Tuberculosis with Oral and Gastrointestinal Involvement: Histopathologic and Clinical Insights

Background and Clinical Significance: Extrapulmonary tuberculosis (TB) remains a diagnostic challenge, particularly when affecting rare sites such as the oral cavity and digestive tract. We report the case of a 55-year-old woman with disseminated (miliary) tuberculosis presenting with atypical oral lesions initially suspected to represent a malignant tumor. Case Presentation: The patient had a history of recurrent depressive disorder, cognitive impairment, sleep disturbances, and nicotine/alcohol dependence. She presented with painful ulcerations of the oral cavity, dysphagia, odynophagia, and glossodynia. Otolaryngologic examination revealed reduced tongue mobility and an ulceroinfiltrative lesion involving the floor of the mouth and the lower alveolar ridge. Fibroscopic evaluation confirmed infiltrative ulcerative lesions, and biopsy samples were obtained. Histopathologic examination revealed a chronic necrotizing granulomatous inflammation with multinucleated giant cells, consistent with a mycobacterial infection. Further investigations confirmed disseminated (miliary) tuberculosis with oral and digestive involvement. Antituberculous therapy was initiated; however, despite temporary stabilization, the patient's condition progressively worsened and the outcome was fatal. Conclusions: Oral and digestive tuberculosis, although rare, should be considered in the differential diagnosis of ulceroinfiltrative lesions of the oral cavity, particularly in patients with systemic symptoms or risk factors for TB. Early histopathologic confirmation and initiation of specific therapy are essential for favorable outcomes and prevention of misdiagnosis as malignant disease.