|
| Original diagnosis | Second-opinion diagnosis | Comments |
|
| Malignant to malignant, 2 cases | | |
| Pleomorphic sarcoma | Myxoinflammatory fibroblastic sarcoma | |
| Low-grade spindle cell neoplasm | Low-grade fibromyxoid sarcoma/sclerosing epithelioid fibrosarcoma | MUC4 negative but FUS-CREB gene fusion present |
|
| Malignant to Intermediate, 6 cases | | |
| Low-grade fibromyxoid sarcoma | Fibromatosis | MUC4 negative and β-catenin positive |
| Fibrosarcoma | Fibromatosis | MUC4 negative and β-catenin positive |
| Gastrointestinal stromal tumor | Fibromatosis | KIT and PDGFRA mutational analysis negative and β-catenin positive |
| Synovial sarcoma | Inflammatory myofibroblastic tumor | ALK gene rearrangements absent |
| Sarcoma | Myxoinflammatory fibroblastic sarcoma | |
| High-grade sarcoma, possibly gastrointestinal stromal tumor | Solitary fibrous tumor | KIT and PDGFRA mutational analysis negative and focal TLE1 positive |
|
| Malignant to benign, 2 cases | | |
| Low-grade spindle cell tumor | Nodular fasciitis | |
| Leiomyosarcoma | Mammary-type myofibroblastoma | |
|
| Benign to benign, 13 cases | | |
| Fibrous hamartoma of infancy | Nodular fasciitis | |
| Spindle cell tumor | Fibroblastic tumor without malignant features | ETV6 negative, t(8; 15) present |
| Genital stromal fibroepithelial polyp | Superficial myofibroblastoma | |
| Benign fibrous histiocytoma | Superficial myofibroblastoma | |
| Inflammatory myofibroblastic tumor-type lesion | Fibroblastic proliferation of unknown significance | ALK and MUC4 immunostains negative |
| Lipoma | Intravascular fasciitis | CDK4 immunostain negative |
| Angiomyxoma | Fibroma | |
| Benign lesion | Myofibroblastoma | |
| Specialised genital stromal tumor | Myofibroblastoma | |
| Neurothekeoma | Fibromyxoma | MUC4 negative |
| Benign lesion | Pleomorphic fibroma | |
| Nodular fasciitis | Myofibroma | |
| Benign lesion | Fibroma | |
|
| Benign to malignant, 1 case | | |
| Proliferative myositis | Possibility of low-grade fibromyxoid sarcoma | |
|
| Benign to intermediate, 2 cases | | |
| Angiofibroma | Solitary fibrous tumor | |
| Benign spindle cell lesion | Solitary fibrous tumor | |
| Intermediate to intermediate, 1 case | | |
| Spindle cell neoplasm of uncertain malignant potential | Fibromatosis | |
|
| Intermediate to benign, 5 cases | | |
| Fibromatosis | Scar tissue | Focal β-catenin positive |
| Palmar fibromatosis | Ossifying fasciitis | USP6 positive |
| Atypical nodular spindle cell lesion | Nodular fasciitis | |
| Fibrous pseudotumor/solitary fibrous tumor | Fibroma of testis | |
| Fibromatosis | Proliferative myositis | |
|
| Intermediate to malignant, 2 cases | | |
| Solitary fibrous tumor | Low-grade fibromyxoid sarcoma | MUC4 positive and FUS-CREB gene fusion present |
| Dermatofibrosarcoma protuberans/solitary fibrous tumor | Myxofibrosarcoma | |
|
