Skip directly to site content Skip directly to search


Español  Other Languages


Centers for Disease Control and Prevention. CDC twenty four seven. Saving Lives, Protecting People
 Search
		×
			NIOSH
			NIOSH
				All CDC
				Submit
			For a full list of topics:A-Z Index
			Advanced Search
		Advanced Search


The National Institute for Occupational Safety and Health (NIOSH)








Study Syllabus for Classification of Radiographs of Pneumoconioses						Print
																Related Pages
										Pathology OverviewPathology Basis of Occupational Lung DiseaseCoal Workers’ Pneumoconiosis
CWP is defined as parenchymal lung disease secondary to the inhalation of coal mine dust, which includes both carbonaceous (coal) and noncarbonaceous minerals such as silica and silicates. The composition of coal mine dust and the severity of exposure varies with the miner’s job description [“Pathology standards,” 1979; Green and Vallyathan 1998]. Like silicosis, CWP is classified as simple or complicated depending on the size of individual lesions.
Simple CWP
Inhaled coal particles within the lung are coarse, irregular, often angulated, and black (Fig. 23). The earliest and most distinctive lesion of simple CWP is the coal macule. On macroscopic examination coal macules appear as barely palpable (or nonpalpable) darkly pigmented foci, ranging in size from approximately 1 to 5 mm (Fig. 24). Microscopically, macules are formed by the deposition of black pigment, with minimal associated fibrosis within and around the walls of respiratory bronchioles and alveolar ducts. Airspace dilatation around the macule, termed *focal emphysema*, is an integral component of the lesion and is considered to represent a form of centrilobular emphysema (Fig. 25) [“Pathology standards,” 1979; Green and Vallyathan 1998]. Simple CWP may also include the presence of small, heavily pigmented, fibrotic nodular lesions of 2 morphological forms: stellate lesions of mixed-dust fibrosis (Fig. 21) or rounded nodules resembling silicotic nodules (Fig. 26). The formation of fibrotic nodules is thought to be related to the content of silica in inhaled coal mine dust [Green and Vallyathan 1998].SILICOSISPage 1 of 3COMPLICATED CWP
							
					
							Last Reviewed:  April 26, 2023						Source: 	National Institute for Occupational Safety and Health
					Facebook
        Twitter
        LinkedIn
        Syndicate homeStudy Syllabus for Classification of Radiographs of Pneumoconioses
Introductionplus icon
Preface
Appreciation to Contributors
Intent of the Self-study Syllbus
Getting Started
Clinical Overviewplus icon
Major Occupational Lung Diseasesplus icon
Pneumoconioses
Central Role of Diagnostic Imagingplus icon
Role of CT
Overview of Nonimaging Clinical Tools in Lung Disease Diagnosis
Appendix A
References
Pathology Overviewplus icon
Pulmonary Silicosis
Coal Workers’ Pneumoconiosis
Asbestos Pleuropulmonary Disease
Pathological-Clinical Correlations
References
Radiograph Classificationplus icon
SUBSET 1 – Radiograph Classification, #1 to #19plus icon
Introduction
Radiograph Identification
Section 1: Image Quality
Section 2: Parenchymal Abnormalities, #1 to #14
Section 3: Pleural Abnormalities, #15 to #19
Section 4: Any Other Abnormalities
Section 5
SUBSET 2 – Radiograph #20 to #27plus icon
Radiograph #20
Radiograph #21
Radiograph #22
Radiograph #23
Radiograph #24
Radiographs #25 to #27
SUBSET 3 – Radiograph #28 to #38plus icon
Radiographs #28 to #30
Radiographs #31 to #32
Radiographs #33 to #35
Radiographs #36 to #38
SUBSET 4 – Radiograph #39 to #46 (Small and Large Opacities)plus icon
Radiographs #39 to #40
Radiographs #41 to #42
Radiographs #43 to #44
Radiograph #45
Radiograph #46
SUBSET 5 – Classifications and Answer Keys, Radiographs #47 to #83
Quiz Follow NIOSH Facebook
Pinterest
Twitter
YouTube
 NIOSH Homepage NIOSH A-Z
Workplace Safety & Health Topics
Publications and Products
Programs
Contact NIOSH


About CDC
					Contact Us
					800-232-4636
 Facebook Twitter Instagram LinkedIn Youtube Pinterest Snapchat
 CONTACT CDC
				Contact Us
							Call 800-232-4636
							Email Us
			ABOUT CDC
				About CDC
							Jobs
							Funding
			POLICIES
				Accessibility
							External Links
							Privacy
							Policies
							No Fear Act
							FOIA
							OIG
							Nondiscrimination
							Vulnerability Disclosure Policy
			CONNECT WITH US
				Facebook
								Twitter
								Instagram
								LinkedIn
							Youtube
								Pinterest
								Snapchat
								Email
			LANGUAGES
				Español
							繁體中文
							Tiếng Việt
							한국어
							Tagalog
							Русский
							العربية
							Kreyòl Ayisyen
							Français
							Polski
							Português
							Italiano
							Deutsch
							日本語
							فارسی
							English


U.S. Department of Health & Human Services
			Accessibility
			External Links
			Privacy
			Policies
			No Fear Act
			FOIA
			Nondiscrimination
			OIG
			Vulnerability Disclosure Policy
			USA.gov


Exit Notification / Disclaimer Policy Close
 Links with this icon  indicate that you are leaving the CDC website. The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website.
				Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
				You will be subject to the destination website's privacy policy when you follow the link.
				CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. Website Disclaimers
 Cancel Continue