Infliximab Therapy Leading to Pulmonary Tuberculosis in a Patient With Negative Interferon γ Release Assay (IGRA)-Based QuantiFERON Gold Test.

Infliximab therapy is associated with higher rates of active tuberculosis (TB), particularly extrapulmonary and disseminated forms with unusual symptoms. We report the case of a 66-year-old man with Crohn's disease who developed TB mimicking lung cancer on imaging. He presented with cough and fever of 2 weeks' duration shortly after starting infliximab. Computed tomography of the chest revealed a 7.0 × 3.2 cm2 pleural-based mass, highly suspicious for malignancy. Histopathological examination confirmed the diagnosis of TB. The mass disappeared after antitubercular treatment, and the patient recovered completely. A review of the literature suggests that TB masquerades as lung cancer clinically and radiologically. The classical lesions of TB are cavitatory with calcifications. Mass lesions without cavity or calcifications are rare and are mostly reported from regions endemic for TB. The majority of patients on infliximab therapy required biopsy for accurate diagnosis of TB because of its unusual presentation.

Chronic Lymphocytic Leukemia: A Rare Cause of Pathological Fracture of the Femur.

The incidence rate of chronic lymphocytic leukemia (CLL) in the United States is approximately 0.005%; men are at slightly higher risk than women. Bony involvement or pathological fracture rarely occurs in CLL, and it may be the initial presentation. An 85-year-old woman presented with acute respiratory failure secondary to pneumonia. Symptomatology included dyspnea. She was found to have pathological fracture of the femur caused by CLL. The diagnosis of CLL had been made 6 years previously, but the patient had refused therapy. On admission, the patient required endotracheal intubation, mechanical ventilation, and admission to the medical intensive care unit. Endotracheal intubation extubation was successful after 48 hours. The patient then complained of severe left knee pain. Bone radiograph and femoral computed tomography scan revealed acute pathological fracture of the left distal femur. There was no history of trauma. The fracture was stabilized with extension lock splint. Pathological fracture in patients with CLL is associated with hypercalcemia, Richter's transformation, or multiple myeloma. This patient exemplifies the fact that pathological fracture can be caused by CLL in the absence of hypercalcemia, Richter's transformation, or multiple myeloma and can be the initial presentation of CLL.