Pulmonary Inflammatory Pseudotumor Presenting as Fever of Unknown Origin / 감염

ABSTRACT

Inflammatory pseudotumor (IPT) is an uncommon benign neoplasm of unknown etiology presenting as an incidental mass, fever, malaise, anemia, and weight loss. Generally, IPT in the lung is asymptomatic. A case of pulmonary IPT presenting as prolonged fever in a 59 year old man is presented with clinicopathological findings. The patient had been febrile for three months before admission. Five months before admission, a chest X-ray showed a small left pulmonary mass which was regarded as old tuberculosis. An chest X-ray taken on admission revealed a left pulmonary mass two times the size of the one on the first x-ray. Percutaneous needle aspiration and biopsy were performed, and the microscopic examination revealed a plasma cell reaction with myofibroblastic proliferation, consistent with IPT. As prolonged unexplained fever is a frequent symptom in patients with IPTs, this disease entity should be included in the differential diagnosis of fever of unknown origin.