Free Medical Images Collection

These days I am illustrating Wikipedia articles with images related to medicine. Sometimes, the existing image(s) on an article are too old, so I would want to add a newer, higher resolution image by replacing the old one. Some articles do not have images at all. A major problem for me was in finding the right image for the given article. Wikipedia accepts images/media that are CC-BY-SA or lower, so I had to go through the existing image repositories to find out those with the right license for Wikipedia. I decided to tabulate some of the image repositories that have medical content, along with the license they are shared under. I hope this would be useful not only for me, but for everyone else who are looking for free images related to medicine. Please note that this is not a comprehensive list, I have only included the repositories that I know of.

Source License Notes
Creative Commons search CC-varied Datasets from these collections are found on CC-search.
All Free Photos Free photos of all kinds
Burst Images Public Domain Free photos of all kinds
Medpix All Rights Reserved Medpix is a repository of medical cases run by the NIH, USA. The images are free for personal use, but need permission from the authors for any use other than personal. Contact the authors directly for permission.
Radiopedia CC-BY-NC-SA Collection of radiology images. Copyright rests with the author of the image.
Flickr Commons CC varied Media from Flickr Commons also shows up on CC search.
British Library Images from British Library, UK
ASH Image bank Fair Use A collection of hematology images. Login needed, free account creation.
Centre for Disease Control and Prevention Mostly Public Domain Images related to healthcare, diseases, health promotion etc.
Brain Biodiversity Bank All rights reserved Altas of human brain. Radiology images and 3D movies available. Free re-use permitted, contact the authors for re-use permissions.
US National Library of Medicine Fair Use Contain images related to. medicine. Obtain permission from the website for re-use. Permission shall be granted on a case-by-case basis. Some images are CC.
National Eye Institute CC varied Some images are CC-BY. Results can be found from CC-search.
Duke University Digital Repository CC-BY-NC-SA Contains advertisements and handouts of medical products
Visible Body All Rights Reserved Some content is available without subscription. Contains 3D anatomy resources.
3D Embryo Atlas CC-BY-NC-ND Media related to embryology
Bio Atlas Use with attribution Contains high resolution histology and histopathology images of humans and animals
CAOM Histopathology slides, pages are slow to load. From Poznan
Brain-Maps Histo- and gross images of brains of humans and animals
Cancer Digital Archive Image repository of oncopathology
Aurora M-scope Most images in Public Domain Contains histopathology slides. Needs a special software for opening the files in high resolution.
Heidelberg University All Rights Reserved Contains educational images related to pathology
Pathobin A platform for uploading pathology slides. Copyright lies with the uploader.
National Institute of Health, USA Public Domain Images are on Flickr, hence available using CC-search.
Europeana CC varied Contains media related to history of medicine and natural history
Fossil Forum Collection of fossils. Individual uploaders hold the copyright. Fair use permitted.
Medillsb Varied Website of the association of medical illustrators. Contact individual authors for re-use.
Medical Graphics DE CC-BY-ND Illustrations related to medicine.
LifeScienceDB CC-BY-SA Create your own photos and videos of human anatomy
Neuroanatomy CC-BY-SA-NC Neuroanatomy media. From University of British Columbia. Contains 360 degree views of the brain, MRIs etc.
Dollar Street CC-BY-SA Collection of everyday objects, people, families showing socioeconomic status of people around the world.
Cell Image Library CC-varied Mostly public domain images of cells.
Heal Collection CC varied Images for medical education.
Stanford Medical Library CC varied Images related to medicine from Stanford.
National Cancer Institute CC-varied Contains media related to cancer.
Histology Atlas CC-BY-NC-ND Histology images
Audilab CC-BY-NC-SA 3D images related to anatomy
Sketchfab CC-BY-NC-SA Illustrations related to human body
Open Access Biomedical Search Engine Can perform advanced search by License type
Science Images of Australia CC-BY Natural history, medicine images
Library of Congress collection Varied History of medicine
The noun project CC-BY Contains icons for general use and those related to medicine
Somersault Images CC-BY-SA-NC Illustrations related to medicine
Smart Servier CC-BY Illustrations related to medicine
Ghorayeb Images CC-BY-NC=ND Collection of images from ENT
Ecure Me All Rights Reserved Illustrations and photos of diseases
University of California All Rights Reserved Images of clinical signs and symptoms
University of Iowa All Rights Reserved Images of dermatological conditions
Internet Pathology Laboratory All Rights Reserved Images related to pathology
Atlas of endoscopy All Rights Reserved Images related to endoscopy/gastroenerology

Gender Gap in Wikipedia’s content

Only 15% of all biographies on English Wikipedia belong to women. Women and men are portrayed differently on Wikipedia in terms of article structure, the use of infoboxes, network properties, notability etc. This research project is aimed at mapping the gender gap on Wikipedia in terms of its content. This work is done as a followup report to my presentation at WikiWomenCamp 2017. The aim is to create a review of peer-reviewed research papers on gender gap on Wikipedia’s content.


  • Find all relevant articles for the analysis using Google scholar. Keywords used are ‘Wikipedia’, ‘gender’, ‘content’, ‘women’, ‘bias’ and various relevant combinations of these words.
  • Screen the title and abstract to include only those studies that fit the inclusion criteria. Further screening for content to only include the studies about gender gap in Wikipedia’s content.
  • Assess the validity and reliability of the results
  • Systematic presentation of the findings
Rosie Stephenson Goodnight has worked extensively on bridging the gender gap in English Wikipedia. Photo: Camelia.boban, CC-BY-SA 4.0, Wikimedia Commons


The results were summerized under four categories :

  • Coverage bias : Coverage bias occurs when men and women are covered differently on Wikipedia. For example, the coverage bias may manifest as differences in the number of notable women and men portrayed on Wikipedia.
Research Data Methods Findings
Wagner et al [1] Wikipedia in 6 language editions Wikipedia in 6 languages compared to several datasets: Freebase, Pantheon, Human Accomplishment, crawled the content of articles about people in the reference datasets using Wikipedia’s API (November 2014). Men and women are covered equally well on Wikipedia and articles about women tend to be longer than articles about men on Wikipedia, when compared to those from the reference datasets.
Graells-Garrido et al [2] The DBPedia 2014 dataset, The Wikipedia English Dump of October 2014 The DBPedia and Wikipedia data dump were analysed for metadata properties. The gender of a biography, whenever not mentioned, was determined by ‘inferred gender for Wikipedia biographies’ (Bamman and Smith) 15% of articles in ‘Person class’ were about women. In comparison to the global proportion of women, the categories that over-represent women are Artist, Royalty, FictionalCharacter, Noble, BeautyQueen, and Model.
Reagle & Rhue [3] Biographical subjects from several sources (100 Most Influentiial figures in American History, TIME magazine’s list of 2008’s most influential people, Chambers Biographical dictionary, American National Biography Online) compared to English Wikipedia and Britannica. A Python program was used to compare web pages related to the subjects targeted in the reference sources. Google API was queried for top four results. Gender was guessed by the balance of gendered pronouns (she, her, he, his). The length of an article is determined by the words of article content and does not include citations and other miscellany. Wikipedia provides better coverage and longer articles on women than Britannica. Wikipedia has more articles about women than Britannica in absolute terms, but articles about women on Wikipedia are more likely to be missing than articles about men compared to Britannica.
Wagner et al [4] DBPedia 2014 dataset, inferred gender for Wikipedia bios Calculated the number of language editions in which per biography is represented and google search volume of women’s bio, compared them with Wikipedia articles Women in Wikipedia are more notable than men, which the authors interpret as the outcome of a subtle glass ceiling effect.
  • Structural bias : Structural bias refers to preferential use of gender-specific tendencies while connecting articles on notable people. For example, there may be more links to men’s biographies on articles related to women.
WikiGap is a program dedicated to closing the content gap on Wikimedia.
Research Data Methods Findings
Wagner et al [1] Wikipedia in 6 language editions Wikipedia’s API (November 2014), analysed for probability that a link from article with gender g1 ends in an article with gender g2. Articles about women connect less to articles about men via interlinks. Articles about people with the same gender tend to link to each other. Articles about women tend to link more to articles about men than the opposite. Men are more central than women in English, Russian and German language Wikipedia.
Graells-Garrido et al [2] The DBPedia 2014 dataset, The Wikipedia English Dump of October 2014 Proportion of links from gender to gender was calculated and tested against expected proportions. Analysed distribution of PageRank by gender to understand centrality. Women biographies tend to link more to other women than to men. The article with highest centrality tend to be predominantly about men, beyond what one could expect from the structure of the network.
Wagner et al [4] DBPedia 2014 dataset, inferred gender for Wikipedia bios, attributes, PageRank Explored to what extent the connectivity between people is influenced by gender. Investigated the relation between the centrality of people and their gender using PageRank. The top-ranked women according to PageRank are slightly less central than men, and the centrality of women decreases faster than that of men with decreasing rank. There exists a bias in the generation of links by Wikipedia editors, favoring articles about men.
  • Lexical bias : Lexical bias refers to the inequalities in the terms used to describe men and women on Wikipedia. For example, the articles about women are more likely to have details about their family life.
Research Data Methods Findings
Wagner et al [1] Wikipedia in 6 language editions Open vocabulary approach where classifier determines which words are most effective in distinguishing the gender of the person an article is about. Log likelihood ratios are used for comparing different feature-outcome relationships. There is lower salience of male-related words in articles about men, which can be related to the idea of male as the null gender (there is a social bias to assume male as the standard gender in certain social situations). Words like “married”, “divorced”, “children” or “family” are much more frequently used in articles about women. This study confirms that men and women are presented differently on Wikipedia and that those differences go beyond what we would expect due to the history of gender inequalities.
Graells-Garrido et al [2] The DBPedia 2014 dataset, The Wikipedia English Dump of October 2014, Linguistic Inquiry and Word count (LIWC) dictionary To explore which words are more strongly associated with each gender, Pointwise Mutual Information is measured over the set of vocabulary in both genders. Also considered burstiness, a measure of word importance in a single document according to the number of times it appears within the document, under the assumption that important words appear more than once (they appear in bursts) when they are relevant in a given document. Marriage and sex-related content are more frequent in women’s biographies and cognition related content is highlighted in men’s biographies. Words most associated with men are mostly about sports, while the words most associated with women are to arts, gender and family. Of particular interest are two concepts strongly associated with women: her husband and first woman.
Wagner et al [4] Overview of English Wikipedia biographies, inferred gender for Wikipedia bios Analysed gender topic, relationship topic and family topic in Wikipedia’s biographies. Quantified the tendency of expressing positive and negative aspects of biographies with adjectives, as a measure of the degree of abstraction of positive and negative content. Family-, Gender-, and relationship-related topics are more present in biographies about women, linguistic bias manifests in Wikipedia since abstract terms tend to be used to describe positive aspects in the biographies of men and negative aspects in the biographies of women.
  • Visibility bias: Visibility bias occurs when articles related to men and women are differently promoted within Wikipedia. For example, men’s biographies are potentially more likely to be featured articles than women’s biographies, although the difference is not significant.
Research Data Methods Findings
Wagner et al [1] Wikipedia in 6 language editions Proportion of women’s biographies that make it to the main page of Wikipedia Selection procedure of featured articles of Wikipedia community does not suffer from gender bias.


Women Wikimedians at WikiConference, India 2016. According to a 2011 survey, only 3% of Indian Wikimedians were women. Photo: Afifa Afrin, CC-BY-SA, Wikimedia Commons


  1. ↑ a b c d It’s a man’s Wikipedia? Assessing Gender Inequality in an online Encyclopedia Wagner, Claudia; Garcia, David; Jadidi, Mohsen; Strohmaier, Markus (May 2015). “It’s a man’s Wikipedia? Assessing Gender Inequality in an online Encyclopedia”Proceedings of the Ninth International AAAI Conference on Web and Social Media. Retrieved 28 July 2017.
  2. ↑ a b c Graelles-Garrido, Eduardo; Lalmas, Mounia; Menczer, Filippo (September 2015). “First Women, Second Sex : Gender Bias in Wikipedia”Social and Information Networks. Retrieved 28 July 2017.
  3.  Reagle, Joseph; Rhue, Lauren (2011). “Gender bias in Wikipedia and Britannica”International Journal of Communication S: 1138–1158. Retrieved 28 July 2017.
  4. a b c Wagner, Claudia; Graelles-Garrido, Eduardo; Garcia, David; Menczer, Filippo (2016). “Women through the glass ceiling: gender asymmetries in Wikipedia” (PDF). EPJ Data Science. Retrieved 30 July 2017.


The same article can be found on meta-wiki here. A longer presentation containing information regarding gender gap research on Wikipedia can be found here.

Featured photo courtesy: Martina Cora, CC-BY-SA 4.0, Wikimedia Commons