It is a histological finding, not a pathological description. When associated with disease, it is known as "Respiratory bronchiolitis-associated interstitial lung disease" or "RB-ILD". Also, this disease is predominately found in the upper lobe with centrilobar ground glass nodules. Importantly, no fiborisis is involved, just bronchial wall thickening. Treatment is to stop smoking.
^Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease. St. Louis, Mo: Elsevier Saunders. p. 741. ISBN0-7216-0187-1.