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Table 21 Causes of Unresolved Infiltrates

Infectious Causes

Common infectious causes

Pneumococci
Haemophilus influenzae
Viral agents
Staphylococcus aureus
Legionella organisms
Gram-negative organisms

Uncommon infectious causes

Mycobacteria
Fungi
Protozoa
Metazoa
Undetected resistant organisms
Mixed organisms, including anaerobes

Noninfectious Causes

Neoplasm, including lymphoma
Pulmonary emboli
Foreign body

Drugs

Antiarrhythmics

Amiodarone

Antimicrobials

Nitrofurantoins
Penicillins

Anticonvusants

Diphenylhydantoin

Antirheumatics

Methotrexate

Diuretics

Hydrochlorothiazide

Opiates

Cocaine
Heroin
Methadone

Occupational lung disease
Congestive heart failure
Radiation pneumonitis
Fibroproliferative phase of acute respiratory distress syndrome, (ARDS)

Idiopathic

Hypersensitivity pneumonitis
Bronchiolitis obliterans organizing pneumonia, (BOOP)
Wegener’s granulomatosis
Interstitial pulmonary fibrosis