Chondrosarcoma, grade I / Atypical cartilaginous tumour

Lobulated; mildly cellular lobules of polygonal cells

Pale eosinophilic cytoplasm

Round-ovoid hyperchromatic nuclei with mild pleomorphism and occasional bi-nucleation; inconspicuous mitotic activity

Abundant hyaline cartilage matrix; areas of collagen fibres

Lobulated; infiltrative; mildly cellular lobules of stellate-polygonal cells

Pale eosinophilic cytoplasm

Round-ovoid hyperchromatic nuclei with mild pleomorphism; inconspicuous mitotic activity

Abundant hyaline cartilage matrix; areas of myxoid degeneration; patchy necrosis

Lobulated; infiltrative; hypocellular lobules of stellate-polygonal cells

Pale eosinophilic cytoplasm

Round-ovoid hyperchromatic nuclei with mild pleomorphism; inconspicuous mitotic activity

Abundant hyaline cartilage matrix; patchy necrosis