CASE 109

Unenhanced chest CT (lung window) (Figs. 109.1A, 109.1B) reveals bilateral, patchy ground glass opacities and thin-walled cysts that are more extensive in the lower lobes. There is mild interlobular septal thickening (Fig. 109.1B). A 1.0 cm nodule is also seen in the left lower lobe (Fig. 109.1A).

Diagnosis

Lymphocytic Interstitial Pneumonia (LIP)

(Biopsy of left lower lobe nodule revealed amyloid deposition)

Differential Diagnosis

Immunocompetent Patients

• Nonspecific Interstitial Pneumonia (NSIP)

• Hypersensitivity Pneumonitis (HP)

• Various Drug Reactions

• Sarcoidosis

• Low-grade B-Cell Lymphoma; Mucosal-Associated Lymphoid Tissue (MALT)

• Lymphangitic Carcinomatosis

Patients With HIV-AIDS

• Pneumocystis jiroveci Pneumonia

• Mycobacterium avium-intracellulare Complex Infection

• Fungal Pneumonia

Discussion

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