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An uncommon cause of bilateral pulmonary nodules in a long-term smoker.

ABSTRACT: BACKGROUND: Dyspnea caused by pulmonary disease is a common symptom encountered by internists. The most likely diagnosis of pulmonary nodules in a long-term smoker is lung cancer. PATIENT/PARTICIPANT: We report a case of an elderly male with a 70-pack-year smoking history, presenting with exertional dyspnea for 6 months. INTERVENTIONS: Detailed review of history was negative. Examination was normal except for diminished breath sounds in all lung fields. Chest x-ray showed bilateral nodular opacities. Computed tomography of thorax revealed multiple bilateral lung masses. A whole-body positron emission tomography revealed enhancement only of the pulmonary masses. Bronchoalveolar lavage was negative for acid fast bacilli, nocardia, and fungi. MAIN RESULTS: Lung biopsy showed findings consistent with amyloidosis. Bone marrow biopsy done to investigate primary amyloidosis showed no clonal plasma cells or amyloid staining, thus suggesting a diagnosis of localized pulmonary amyloidosis. Patient is being managed conservatively with close follow-up for signs of progression.

SUBMITTER: Gaurav K

PROVIDER: S-EPMC2219804 | biostudies-other | 2007 Nov

REPOSITORIES: biostudies-other

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Project description:BackgroundDiffuse idiopathic pulmonary neuroendocrine cell hyperplasia (DIPNECH) is characterized by multifocal proliferation of pulmonary neuroendocrine cells. On chest CT, DIPNECH exhibits bilateral pulmonary nodules and mosaic attenuation in most patients. We sought to: (1) assess the specificity of this pattern (i.e., bilateral pulmonary nodules together with mosaic attenuation) for DIPNECH; (2) describe its differential diagnosis; and (3) identify the clinico-radiologic features that may help prioritize DIPNECH over other diagnostic considerations.MethodsWe searched the Mayo Clinic records from 2015 to 2019 for patients with bilateral pulmonary nodules and mosaic attenuation on CT who had a diagnostic lung biopsy. A thoracic radiologist reviewed all CT scans. Chi-square test was used for categorical variables, and odds ratios were utilized to measure the association between certain variables and DIPNECH.ResultsFifty-one patients met our inclusion criteria; 40 (78%) were females and 34 (67%) were never-smokers. Median age was 65 (interquartile range 55-73) years. Lung biopsy was surgical in 21 patients (41%), transbronchial in 17 (33%), and transthoracic in 12 (24%); explanted lungs were examined in 1 (2%). Metastatic/multifocal cancer was the most common diagnosis, and was found in 17 (33%) cases. Bronchiolitis was diagnosed in 12 patients (24%), interstitial lung disease in 10 (20%), and DIPNECH in 5 (10%). Previous diagnosis of an obstructive lung disease (odds ratio 15.8; P = 0.002), and peribronchial nodular distribution on CT (odds ratio 14.4; P = 0.006) were significantly correlated with DIPNECH. Although statistical significance was not reached, DIPNECH nodules were more likely to display solid attenuations (80% vs. 67%, P = 0.45), and were more numerous; > 10 nodules were seen in 80% of DIPNECH cases vs. 52% in others (P = 0.23). Because DIPNECH primarily affects women, we analyzed the women-only cohort and found similar results.ConclusionsVarious disorders can manifest the CT pattern of bilateral pulmonary nodules together with mosaic attenuation, and this combination is nonspecific for DIPNECH, which was found in only 10% of our cohort. Previous diagnosis of an obstructive lung disease, and peribronchial distribution of the nodules on CT increased the likelihood of DIPNECH vs. other diagnoses.

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An uncommon cause of bilateral pulmonary nodules in a long-term smoker.

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