Diffs

Ground-Glass Opacity at CT:

Ground glass opacification (GGO) is seen as increased opacification of lung without obscuration of the bronchial and vascular markings [1,2]. GGO can represent partially filled alveoli, active inflammation, or fine fibrosis below the resolution of CT images [2].

A:

Alveolar proteinosis

Acute chest syndrome

Acute lung transplant rejection

Adult respiratory distress syndrome

Acute interstitial pneumonitis

B:

Blood (Etiologies of pulmonary hemorrhage include: Goodpasture's syndrome, Wegener's granulomatosis, Systemic Lupus Erythematosis, Vasculitis, Anticoagulation, Blunt or penetrating trauma)

Bronchiolitis obliterans oganizing pneumonia (BOOP)

Bronchiolitis-associated interstitial lung disease

Bronchoalveolar lavage

C:

CMV (Herpes simplex and pneumocystits)

Contusion

Cancer (Bronchoalveolar cell carcinoma)

D:

Drug toxicity

Desquamtive interstitial pneumonitis

E:

Extrinsic allergic alveolitis

Eosinophilic pneumonia

Edema

F:

Fibrosis

G:

Granulomatous disease (Sarcoid)

I: Infection

Pneumocystis carinii pneumonia

REFERENCES:

(1) AJR 1997; 169: 355-367

(2) AJR 2005; Miller WT, Shah RM. Isolated diffuse ground-glass opacity in thoracic CT: causes and clinical presentations. 184: 613-622