There are 2 repositories under medical-imaging-datasets topic.
NanoNet: Real-Time Polyp Segmentation in Capsule Endoscopy & Colonoscopy [Contains an open-access capsule endoscopy dataset (2021 IEEE CBMS)]
Python package for programmatic access to the National Biomedical Imaging Archive (NBIA) and The Cancer Imaging Archive (TCIA)
A list of public datasets for medical image analysis
Readers for medical imaging datasets