Image credits
The tissue slide pictures around the site are decorative only. They are not part of any question and do not represent a diagnosis.
Histology of a normal colonic mucosal epithelium
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /
Source on Wikimedia Commons
Normal breast acinus
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /usmle-step-1
Source on Wikimedia Commons
Histology of normal prostate
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /about
Source on Wikimedia Commons
Histology of ovarian stroma
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /resources
Source on Wikimedia Commons
Histopathology of high-grade DCIS
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /how-it-works
Source on Wikimedia Commons
Histology of apocrine cells
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /privacy
Source on Wikimedia Commons
High magnification histology of pars distalis of the anterior pituitary gland
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /terms
Source on Wikimedia Commons
Histopathology of clear cell renal cell carcinoma, grade 1
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /credits
Source on Wikimedia Commons
Histopathology of the gastro-esophageal junction
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /login
Source on Wikimedia Commons
Epidermis, papillary dermis and reticular dermis
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /forgot-password
Source on Wikimedia Commons
Histopathology of mitral valve with myxomatous degeneration
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /usmle-for-imgs
Source on Wikimedia Commons
Cytology of benign follicular epithelial cells (thyroid)
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /contact
Source on Wikimedia Commons
Adipose tissue with crumpling artifact due to insufficient fixation
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin
Source on Wikimedia Commons
Apoptotic neutrophil with nuclear fragmentation
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/analytics/demographics
Source on Wikimedia Commons
CK7 of metastatic carcinoma to lymph node
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/analytics/engagement
Source on Wikimedia Commons
Chorionic villus with Hofbauer cells
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/analytics/growth
Source on Wikimedia Commons
Actinomyces on Pap test
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/analytics/performance
Source on Wikimedia Commons
Blood seen on Pap smear from thyroid cyst, horizontal format
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/analytics/question/$questionId
Source on Wikimedia Commons
Blood seen on Pap smear from thyroid cyst, high magnification
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/analytics/questions
Source on Wikimedia Commons
Cholesterol polyp with reactive changes
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/analytics/retention
Source on Wikimedia Commons
Birefringence microscopy of pseudogout
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/audience
Source on Wikimedia Commons
Birefringence microscopy of gout, original
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/audit-log
Source on Wikimedia Commons
Cross-section of whipworm on microscopy, original
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/categories
Source on Wikimedia Commons
Cytopathology of pleomorphic adenoma, original
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/images
Source on Wikimedia Commons
HE stained section of adenocarcinoma in peritoneal fluid
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/import
Source on Wikimedia Commons
Cytopathology of Warthin's tumor, original
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/import/$batchId
Source on Wikimedia Commons
Cytology of normal mesothelium, original
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/messages
Source on Wikimedia Commons
Cytology of reactive mesothelium, original
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/questions
Source on Wikimedia Commons
Gram negative rods and gram positive cocci 1
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/questions/$questionId/edit
Source on Wikimedia Commons
Gram negative rods and gram positive cocci 2
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/questions/$questionId/preview
Source on Wikimedia Commons
Gram stain of a macrophage with ingested S epidermidis bacteria
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/questions/new
Source on Wikimedia Commons
Histology of a lipoblast-like histiocyte in fat necrosis
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/settings
Source on Wikimedia Commons
Endocervical cells on Pap test
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/users
Source on Wikimedia Commons
Histopathology of a biopsy of a melanoma metastasis to the brain
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /admin/users/$userId
Source on Wikimedia Commons
Histopatholgoy of acute gangrenous cholecystitis
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/bookmarks
Source on Wikimedia Commons
Histopathology of a fresh thrombus
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/create-test
Source on Wikimedia Commons
Histopathology of a bile duct hamartoma, low magnification
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/dashboard
Source on Wikimedia Commons
Histopathology of a bile duct hamartoma, high magnification
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/history
Source on Wikimedia Commons
Histology of synovial membrane
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/history/$attemptId
Source on Wikimedia Commons
Histology of vas deferens
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/incorrect
Source on Wikimedia Commons
Histopathology of a false diverticulum of the gallbladder
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/notes
Source on Wikimedia Commons
Histopathology of a blood clot with postmortem bacterial growth
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/performance
Source on Wikimedia Commons
Histology of the mesothelial lining of a hernia sac
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/performance/categories
Source on Wikimedia Commons
Histopathology of a metastatic melanoma to a lymph node
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/performance/time
Source on Wikimedia Commons
Histopathology of acute sinusitis
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/performance/topics
Source on Wikimedia Commons
Histopathology of a rheumatoid nodule, original
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/performance/trends
Source on Wikimedia Commons
Histology of chorionic villus at term
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/results/$attemptId
Source on Wikimedia Commons
Histology of neutrophil margination
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/review/$attemptId
Source on Wikimedia Commons
Histopathology of a fibrolipoma
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/settings/account
Source on Wikimedia Commons
Histopathology of a centroblast in follicular lymphoma
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/settings/display
Source on Wikimedia Commons
Histopathology of adrenal congestion
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/settings/profile
Source on Wikimedia Commons
Histopathology of a reactive lymph node in cholecystitis
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/settings/study
Source on Wikimedia Commons
Histopathology of acute osteomyelitis
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/test/$testId
Source on Wikimedia Commons
Histology of pars distalis of the anterior pituitary with chromophobes, basophils, and acidophils
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/test/$testId/submit-review
Source on Wikimedia Commons
Histopathology of glioblastoma, high magnification
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /app/welcome
Source on Wikimedia Commons
Histopathology of cartwheel pattern in dermatofibrosarcoma protuberans, original
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /reset-password
Source on Wikimedia Commons
Histopathology of avascular necrosis
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /signup
Source on Wikimedia Commons
Histopathology of an atypical lipomatous tumor or well-differentiated liposarcoma, lipoma-like subtype
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /usmle-step-1/sample-questions
Source on Wikimedia Commons
Histopathology of inverted urothelial papilloma
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /usmle-step-2-ck
Source on Wikimedia Commons
Histology of a Pacinian corpuscle
Creator: Mikael Häggström, M.D.
License: CC0 1.0 (Public Domain Dedication)
Attribution: None required (CC0); credited as a courtesy.
Used on: /specialty-quiz
Source on Wikimedia Commons