TY - JOUR AU - Collins, J; Blankenbaker, D; Stern, E J TI - CT patterns of bronchiolar disease: what is “tree-in-bud”? JO - AJR Am J Roentgenol VL - 171 PY - 1998 DO - 10.2214/ajr.171.2.9694453 SP - 365 EP - 370 ER -