Cytology - Synovial Fluid

Acute suppurative arthritis

Cartilage fragment and windrowing

Cartilage

Cat with arthritis

CCL tear, nonsuppurative, lymphocytes including plasmacytoid inset

Degenerative arthropathy

Degenerative arthropathy with both iatrogenic and pathologic hemorrhage - plt clump and erythrophage

Degenerative arthropathy with fibrin and collagen

Degenerative arthropathy with fibrin

Degenerative arthropathy with many fibrin strands

Degenerative arthropathy

DJD w osteoclast

DJD, asterisks are glumps of mucin

Ehrlichial polyarthritis in a dog

Fibrin clot in a cat with severe blunt force trauma

Fibroblastic proliferation, response to chronic joint dz

Hemarthrosis

Histiocytic sarcoma

Histoplasma capsulatum in a cat

Iatrogenic blood contamination, note platelet clump

Immune-mediated polyarthritis, LE cell on right

Immune-mediated polyarthritis, neutrophil with phagocytized material likely nucleic acid

Incidental synovial lining cells including spindle-like appearance

LE cell in suppurative joint disease

Leishmania

Leukophagia indicating ongoing inflammation in a dog with degenerative arthropathy

Lupus erythematosus cell, arrowheads are free nuclear material from smudged inflammatory cells

Metastatic bronchiolar-alveolar carcinoma

Mixed-cell inflammation with calcium deposition, von kossa right, may be due to an earlier dz or systemic histoplasmosis

Normal synovial fluid

Osteoarthritis, nonsuppurative with an osteoclast

Osteoclast due to articular cartilage erosion in degenerative arthropathy

Osteosarcoma

Partial CCL tear

Partial CCL tear

Ragocytes

Reactive synovial tissue, low cell count and protein consistent w early DJD

Septic neutrophilic arthritis, single arrow is pyknotic cell, bacteria in double arrow

Septic suppurative arthritis

Suppurative bacterial arthritis

Suppurative due to lyme disease, nondegenerate, immune-mediate response

Suppurative joint disease due to Ehrlichia ewingii

Suppurative w blasto

Suppurative with Anaplasma phagocytophilum or Ehrlichia ewingii

Suppurative, macros containing histoplasma

Synovial membrane hyperplasia

Synovial sarcoma, ddx reactive synovial cells

Synoviocyte against normal mucin bg

Windrowing of large mononuclears from dog w DJD due to chronic bicipital tendosynovitis