Loefflers syndrome differential diagnosis

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Soroush Seifirad, M.D.[2]

Overview

Loeffler syndrome must be differentiated from other diseases that cause pulmonary eosinophilia, such as Churg-Strauss, drug and toxin-induced eosinophilic lung diseases, other helminthic and fungal infection related eosinophilic lung diseases, and nonhelminthic infections such as Coccidioidomycosis, and Mycobacterium tuberculosis.

Differentiating Loeffler syndrome from other pulmonary eosinophilia syndromes on the basis of etiology.

Diseases		Clinical manifestations						Para-clinical findings							Gold standard	Additional findings
		Symptoms			Physical examination
								Lab Findings			Imaging			Histopathology
						Physical exam 2	Physical exam 3	Increased Eosinophil count (High)	Increased Eosinophil count (Mild to moderate)	ELISA	CXR	CT Scan	Imaging 3
Helminthic and fungal infection-related eosinophilic lung diseases	Transpulmonary passage of larvae (Loffler's syndrome)	Cough Sputum production Wheezing Fever									Round or oval opacities (several millimeters to several centimeters) In both lungs Generally present when blood eosinophilia exceeds 10% Migratory May become confluent in perihilar areas Generally clear spontaneously					Ascaris lumbricoides Hookworms such as: Ancylostoma duodenale Necator americanus) Strongyloides stercoralis
	Tropical pulmonary eosinophilia	cough, breathlessness, wheezing, fatigue, and fever.						40 to 70 percent (>3000/microL) plus elevated IgE levels ( >1000 units/mL)			Diffuse opacities Around 20% of patients have a normal CXR	Reticular and small nodular opacities Bronchiectasis Air trapping Calcification Mediastinal adenopathy				Wuchereria bancrofti Brugia malayi
	Allergic bronchopulmonary aspergillosis								*
	Heavy hematogenous seeding with helminths	depends on the organism for example: periorbital edema, myositis, and eosinophilia (Trichinellosis)						*	*	Trichinellosis: will be positive 2-8 weeks after infection Strongyloides: ELISA is generally positive while stool examination is often negative.	Strongyloides: diffuse ground glass opacities					Ascarids and hookworms Trichinellosis Disseminated strongyloidiasis Cutaneous and visceral larva migrans Schistosomiasis Prior treatment with glucocorticoids may be a risk factor.
	Pulmonary parenchymal invasion							Eosinophilia is prominent in the early stages of disease but minimal with established disease		Useful in later infection with Paragonimus	Nodular with surrounding areas of ground glass Peripheral Common in the mid- and lower lung zones			Finding eggs in the sputum or bronchoalveolar lavage fluid		Helminths such as paragonimiasis
Nonhelminthic infections	Coccidioidomycosis	Manifests as a community-acquired pneumonia (CAP) approximately 7 to 21 days after exposure								Antibody testing may be negative early in the course of disease
	Mycobacterium tuberculosis
Eosinophilic granulomatosis with polyangiitis (Churg-Strauss)								*
Drug- and toxin-induced eosinophilic lung diseases		asymptomatic pulmonary infiltration with eosinophils, chronic cough with or without dyspnea and fever, acute eosinophilic pneumonia, and DRESS should be suspected when the patient has a skin eruption, fever, facial edema, enlarged lymph nodes, and a history of initiation of a culprit medication two to six weeks prior to disease onset							*							Medications such as: Nonsteroidal antiinflammatory drugs Phenytoin L-tryptophan Antibiotics (nitrofurantoin, minocycline, sulfonamides, ampicillin, daptomycin) Toxins such as: Aluminum silicate and particulate metals •Sulfite •Scorpion stings •Inhalation of o heroin, crack cocaine, or marijuana •Inhalation of organic chemicals, dust or smoke, during rubber manufacture, fireworks, firefighting, tobacco smoking •Abuse of 1,1,1-trichloroethane (Scotchgard)
	Acute eosinophilic pneumonia										Diffuse pulmonary opacities on imaging			Bronchoalveolar lavage that reveals ≥25 percent eosinophils When the diagnosis is uncertain lung biopsy is recommended: Histopathologic findings include: Diffuse alveolar damage Hyaline membranes Marked numbers of interstitial and lesser numbers of alveolar eosinophils		Often associated with recent initiation or resumption of cigarette smoking, and less commonly with heavy inhalational exposure to smoke, fine sand, or dust
	Chronic eosinophilic pneumonia	Predominantly in women and nonsmokers Following radiation therapy for breast cancer Cough, fever, progressive breathlessness, weight loss, wheezing, and night sweats; asthma accompanies or precedes the illness in 50 percent of cases						≥40 percent Eosinophilia may be absent in 10-20% of patients			Bilateral peripheral or pleural-based infiltrates described as the "photographic negative" of pulmonary edema is virtually pathognomonic for the disease (in 33% of cases) Pleural effusion Cavitation			BAL eosinophilia ≥25 percent is suggestive of CEP. Nodular bronchial mucosal lesions Necrotizing eosinophilic inflammation Lung biopsy: Interstitial and alveolar eosinophils and histiocytes, including multinucleated giant cells Fibrosis (minimal) Organizing pneumonia (common)
	Idiopathic acute eosinophilic pneumonia							≥25 percent
Diseases		Symptom 1	Symptom 2	Symptom 3	Physical exam 1	Physical exam 2	Physical exam 3	Increased Eosinophil count (High)	Increased Eosinophil count (Mild to moderate)	ELISA	CXR	CT Scan	Imaging 3	Histopathology	Gold standard	Additional findings
	Sarcoidosis								*
	Pulmonary Langerhans cell histiocytosis (Histiocytosis X)								*
	Idiopathic pulmonary fibrosis							<10 percent
	Differential Diagnosis 7