[Verified Answer]: Case 5: A 42-year-old female had been…

Case 5: A 42-year-old female had been experiencing a dry cough and a persistent fever (between 38.5deg C and 39.2deg C) for approximately three weeks. She had also noticed progressive shortness of breath, constant fatigue, and unintentional weight loss (5 kg in 2 months). Physical examination at the local walk-in clinic indicated decreased breath sounds in the upper right lung and tachypnea (RR: 28/min). The doctor also noticed finger clubbing, which is indicative of a chronic pulmonary infection. Blood work showed leukopenia (WBC 3,200/μL), elevated CRP and ESR, and hypoxemia (PaO2: 60 mmHg). She was sent to the local imaging center for a chest CT scan. The radiologist noted nodules with surrounding ground-glass opacities (halo sign) in the right upper lobe. A serum galactomannan assay was positive (Index: 1.6) and a sputum culture grew a fungus with a brown conidial head with conidia originating from a circular vesicle. A lung biopsy indicated invasive septate hyphal structures. Intravenous voriconazole (6 mg/kg every 12 hours on day 1, followed by 4 mg/kg every 12 hours. The patient was transitioned to oral voriconazole after two weeks. Throughout treatment, she was given supplemental oxygen for hypoxemia and corticosteroid tapering to reduce immunosuppression. Treatment responses were monitored with weekly galactomannan assays and serial CT imaging. After 6 weeks of treatment, the patients symptoms resolved, and follow-up imaging demonstrated significant reduction in pulmonary nodules. Galactomannan levels normalized, confirming fungal clearance. The patient was discharged on oral voriconazole for an additional 6 weeks and instructed to follow up with regular pulmonary function tests. Case 5 Etiology: