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
										Radiograph ClassificationSubset 4 – Small and Large OpacitiesRadiograph #39 – Type p
Answer Key #39AAnswer Key #39BAnswer Key #39C (Updated 9/28/2023)Answer Key #39D (Updated 9/28/2023)
Small rounded opacity of type p
**Radiograph #39A** represents a normal lung. The normal vascular pattern is well illustrated. There are several small blood vessels seen on end, which should not be confused with small rounded opacities.
There are **p** a few **t** small opacities present in **Radiograph #39B**, but they are few in number, appearing as tiny opacities like fine grains of sand. This image represents profusion level **1/0**. The identification low profusion radiographs is strongly influenced by the quality of the radiograph. Beware of over-reading profusion in the presence of grid lines, slight underexposure, extensive overlying soft tissue, or excessive radiographic contrast.
**Radiograph #39C**. Here **p** rounded opacities are unequivocally present. Some readers determined profusion to be **1/0** while others preferred **1/1**. This emphasizes the difficulty in determining profusion with limited parenchymal involvement. There are many small blood vessels seen on end. Do not confuse end-on vessels with **q** opacities.
**Radiograph #39D**. Close observation will reveal multiple **p** and a few s opacities. This image represents profusion level **1/1**. There is blunting of the right costophrenic angle but no diffuse pleural thickening is identified.
Radiograph #40 – Type q
Answer Key #40AAnswer Key #40BAnswer Key #40CAnswer Key #40D (Updated 9/28/2023)
Small rounded opacities, type q
**Radiograph #40A**. This image again presents the absence of small parenchymal opacities, profusion **0/0**.
**Radiograph #40B**. In this image the quality is 2 due to significant scapula overlay. Small rounded opacities of the**q** size are subtly but clearly present in the upper zones, but somewhat less profuse than the category **1/1 standard**. In other words, 1/0 profusion.
**Radiograph #40C**. This radiograph illustrates **q** opacities in the upper zones that are more numerous than in Radiograph #40B above, however there are still fewer opacities than in the 1/1 q/q standard. This image presents another example of profusion level 1/0.
**Radiograph #40D** This image is quality 3 due to gridlines, mottle, underinflation and overexposure. However one can still see clear **q** opacities predominately in the upper zones at profusion level **1/1** as well as small blood vessels on end. Note that a few of the small opacities in image D are slightly larger than those in images B and C. The small opacities in all three images are within the defined limits of size for **q** opacities, that is, exceeding 1.5 mm and up to about 3 mm. Hilar adenopathy is likely in 40D and hi is checked in Section 4B. Note partially visible fusion hardware in the lower cervical spine.SMALL OPACITIESPage 2 of 7RADIOGRAPHS #41 AND #42
							
					
							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