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causes (neoplastic, drugs) and many unusual disorders (Pneumocystis carinii, cytomegalovirus, microsporidiosis, Kaposi's sarcoma). A few general rules should be remembered:

(1) A systematic approach must be followed to avoid random investigation which is frequently fruitless, costly and potentially dangerous.

Figure 13. 67Ga-gallium citrate scan showing drug-induced pneumonitis. This 34 year old man was undergoing chemotherapy for Hodgkin's lymphoma (alternating courses of MOPP and ABVD). He developed dyspnea and fever but had a normal chest x-ray and thoracic CT scan. A gallium scan was performed to assess the status of his lymphoma and to exclude an occult focus of infection. The intense diffuse lung uptake (arrows) was attributed to bleomycin and resloved with supportive therapy.

Figure 13. 67Ga-gallium citrate scan showing drug-induced pneumonitis. This 34 year old man was undergoing chemotherapy for Hodgkin's lymphoma (alternating courses of MOPP and ABVD). He developed dyspnea and fever but had a normal chest x-ray and thoracic CT scan. A gallium scan was performed to assess the status of his lymphoma and to exclude an occult focus of infection. The intense diffuse lung uptake (arrows) was attributed to bleomycin and resloved with supportive therapy.

(2) As the duration of fever increases, the likelihood of an infectious cause decreases.

(3) Infection, neoplasm and collagen-vascular disease account for over 70% of classic FUO cases.

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