Infiltrative; hypocellular; spindle cells with loose fascicular-storiform pattern
Amphophilic cytoplasm
Monomorphic ovoid nuclei; rare mitotic activity
Abundant collagenous stroma; scattered polygonal cells with multinucleation
IHC: CD34
RNA-seq: COL1A1::PDGFB gene fusion
Infiltrative; hypocellular; spindle-stellate cells with loose fascicular-storiform pattern
Amphophilic cytoplasm
Monomorphic ovoid nuclei; rare mitotic activity
Abundant collagenous stroma; scattered polygonal cells with multinucleation
RNA-seq: COL1A1::PDGFB gene fusion