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. 2019 Dec 1;111(4):344–360. doi: 10.32074/1591-951X-31-19

Tab. I.

Bland-looking spindle cell lesions of the breast.

Reactive lesions

  • Reactive Spindle Cell Nodule/Exuberant Scar

  • Nodular Fasciitis

  • Inflammatory Pseudotumor

Benign tumors
Specific to mammary stroma Not specific to mammary stroma

  • Myofibroblastoma, classic-type

  • Myofibroblastoma, lipomatous variant

  • Myofibroblastoma, palisaded variant

  • Benign Fibroblastic Spindle Cell Tumor

  • Leiomyoma

  • Schwannoma/Neurofibroma

  • Spindle cell lipoma

  • Solitary fibrous tumor

  • Myxoma

  • Fibroma
Low-grade tumors, locally aggressive

  • Desmoid-type fibromatosis

  • Dermatofibrosarcoma protuberans

Low-grade tumors with metastatic potential

  • Low-grade fibromatosis-like spindle cell carcinoma

  • Low-grade myofibroblastic sarcoma

  • Inflammatory Myofibroblastic Tumor