A database of thousands of medical illustrations that are free to use, no permissions required.
BioRender is a web-based application that helps you easily create biomedical illustrations. Create an account to make graphics from scratch or choose from templates. The basic version is free to use for education purposes. A limited number of discounted licenses are available through Tufts Technology Services.
Ovid has a Multimedia tab, which allows you to browse videos and images across its platform. It also allows Boolean keyword searching of captions in some of its files.
For the latter option: Scroll down Ovid's list of databases and select Books@Ovid or Your Journals@Ovid. Select the Search Fields tab above the search box and change from All Fields to Caption Text. Enter a search string using * for truncation and parentheses to "protect" synonyms, e.g. (hyperlumines* or hyperlucen*). Select Ovid Full Text after a promising citation, examine its figures, and right click to save them.
TCIA is a service which de-identifies and hosts a large archive of medical images of cancer accessible for public download. The data are organized as “Collections”, typically patients related by a common disease (e.g. lung cancer), image modality (MRI, CT, etc) or research focus. DICOM is the primary file format used by TCIA for image storage. Supporting data related to the images such as patient outcomes, treatment details, genomics, pathology, and expert analyses are also provided when available.