Table 1. Etiology of the CT halo sign, by patient immune status.^a .

Variable	Immunocompetent patients (n = 53)	Immunocompromised patients (n = 32)
Primary neoplasm	34 (64)	-
Invasive aspergillosis	-	25 (78)
Metastases	13 (25.0)	2 (6.3)
Lymphoproliferative diseases	-	3 (9.4)
Tuberculosis	2 (3.8)	-
Plasmacytoma	-	2 (6.3)
Staphylococcal pneumonia	1 (1.8)	-
Actinomycosis	1 (1.8)	-
Cryptococcosis	1 (1.8)	-
Histiocytosis	1 (1.8)	-

^aData presented as n (%).