Definition of Characteristic Clinic...

Definition of Characteristic Clinical Profiles in a Series of 16 Patients

Bronchiolitis obliterans organizing pneumonia (BOOP) is a pathologic finding habitual to various injuries to the lung of either definite or idiopathic etiology. Since the presentation of patients with idiopathic BOOP varies, we studied 16 patients with BOOP forward pulmonary histology to define more distinct and homogeneous clinical and imaging profiles of idiopathic BOOP We distinguished three clumps of patients: group 1 (n = 4) with multiple patchy migratory pulmonary involvement of the pneumonia emblem Their clinical course was subacute, with cough febrile affection weight loss, mild dyspnea, and increased ESR Chest x-ray film and CT scan showed multiple alveolar opacities. All patients completely regained with corticosteroid therapy but relapsed when therapy was stopped too rapidly. form into groups 2 (n = 5) had solitary pulmonary involvement of the pneumonia original occurring in a similar clinical adjoining matter Since carcinoma was suspected, they underwent surgical excision of the pneumonic area and get backed without relapse. Group 3 patients (n = 7) currented with diffuse pulmonary involvement of the interstitial lung disease pattern They had more progressive first brunt of more severe dyspnea, crackles heard through the whole extent of all lung surfaces, and interstitial opacities with or without alveolar opacities upon chest imaging. Improvement with corticosteroid therapy was obtained in solely three patients. In all three assemblages lung function test results showed a restrictive pattern. The obstructive pattern characteristic of untarnished bronchiolitis obliterans was found in none. BAL showed a mixed pattern (increase of the two lymphocytes and polymorphonuclear cells) in the patients of the first brace groups. Thus, we distinguished three characteristic clinical and imaging profiles in patients with idiopathic BOOP: multiple patchy pneumonia, solitary pneumonia, and diffuse interstitial lung disease. These profiles are to such a degree different that they should be distinguished in clinical studies of idiopathic BOOP

Whether or not associated with interstitial fibrosis, pulmonary fibrosis may be at hand in the lumen of distal airspaces, ie, alveoli, alveolar conduits and terminal and respiratory bronchioles. Intraluminal fibrosis of distal airspaces consists of stoppers or buds of inflammatory confined apartments fibroblasts, and connective tissue. This pathologic condition is idea of as a response to injury that is used by all to various disorders and thus not specific to undivided disease.[1,2]

Nevertheless, latter reports have emphasized a clinicopathologic entity in which intraluminal fibrosis of distal airspaces is the major pathologic feature, and the etiology is generally unknown. This has been designated as "cryptogenic organizing pneumonitis,"[3] "organizing pneumonia-like process"[4] and "bronchiolitis obliterans organizing pneumonia" (BOOP)[5] The last terminology is now largely accepted, although "intraluminal fibrosis of distal airspaces" would probably be preferable, since it does not predetermine the bronchiolar or alveolar predominance of the condition.

Although it has been clearly distinguished from UIP[6,7] and true bronchiolitis obliterans,[5,7-10] BOOP encompasses several clinical and imaging presentations. In the instant study we distinguished three distinct, homogeneous clinical and imaging profiles in a series of patients studied at our institution, in which intraluminal fibrosis of distal airspaces was construct in specimens of pulmonary tissue in the words immediately preceding [i]or[/i] following of idiopathic pulmonary disease.

MATERIALS AND METHODS

We excellented from the files of the Department of Pathology all the cases of patent intraluminal fibrosis of distal airspaces observ from 1982 to August 1988 forward pulmonary tissue obtained by explain lung biopsy, pulmonary excision (pneumonectomy, lobectomy, segmentectomy), or autopsy.

Pathologic Analysis

For each case, we reviewed three or four different hematoxylineosin-safranin O stained slides of pulmonary tissue. Complementary stains (Verhoeff trichrome) were made in near cases. Electron microscopic and immunohistochemical studies done in four cases will be reported elsewhere. [TABULAR DATA OMITTED]

Systematically we analyzed the following four compartments: alveolar wall and interstitium, alveolar lumen distal airways, and sailing crafts We assessed the mien and abundance of cells (neutrophils, eosinophils, lymphocyte plasma confined apartments giant cells, histiocytes, fibroblasts); granulomas, foreign bodies (under polarization); and connective tissue (fibrosis, collagen, elastic fibers).

Clinical Analysis

For all patients we reviewed the clinical records, chest x-ray films contemporaneous with lung tissue sampling, routine laboratory touchstones including ESR and differential vital fluid cell counts. We also reviewed detailed LFT CT scans, and BAL when done. We exclud the cases where BOOP was secondary to infection or carcinoma. [TABULAR DATA OMITTED]

RESULTS

Intraluminal fibrosis of distal airspaces (BOOP) was at hand in 21 patients. Clinical information was insufficient for correct analysis in the same case. A definite etiology was set up in three cases (sarcoidosis, pulmonary vasculitis, and hyperacute radiation pneumonitis), and in single case of interstitial lung disease a reaction to amiodarone was suspected.