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Histological Classification of Mesenchymal Tumors of Skin and Soft Tissues of Domestic Animals

1 Tumors of Fibrous Tissue
1.1 Benign
1.1.1 Fibroma
1.1.2 Collagenous hamartoma
1.1.3 Nodular dermatofibrosis of the German shepherd dog
1.1.4 Nodular fasciitis
1.1.5 Myxoma
1.1.6 Equine sarcoid
1.2 Malignant
1.2.1 Fibrosarcoma
1.2.1.1 Feline postvaccinal
1.2.1.2 Canine well-differentiated maxillary and mandibular
1.2.2 Myxosarcoma
1.2.3 Malignant fibrous histiocytoma
1.2.3.1 Storiform-pleomorphic
1.2.3.2 Inflammatory
1.2.3.3 Giant cell
2 Tumors of Adipose Tissue
2.1 Benign
2.1.1 Lipoma
2.1.1.1 Infiltrative lipoma
2.1.2 Angiolipoma
2.2 Malignant
2.2.1 Liposarcoma
2.2.1.1 Well-differentiated
2.2.1.2 Pleomorphic
2.2.1.3 Myxoid
3 Tumors of Smooth Muscle
3.1 Benign
3.1.1 Leiomyoma
3.2 Malignant
3.2.1 Leiomyosarcoma
4 Tumors of Striated Muscle
4.1 Benign
4.1.1 Rhabdomyoma
4.2 Malignant
4.2.1 Rhabdomyosarcoma
4.2.1.1 Embryonal rhabdomyosarcoma of the urinary bladder
5 Tumors of Vascular Tissue
5.1 Benign
5.1.1 Hemangioma
5.1.2 Lymphangioma
5.1.3 Scrotal vascular hamartoma
5.1.4 Cutaneous bovine angiomatosis
5.2 Intermediate
5.2.1 Kaposi-like vascular tumor
5.3 Malignant
5.3.1 Hemangiosarcoma
5.3.2 Lymphangiosarcoma
5.3.2.1 Feline ventral abdominal angiosarcoma
6 Tumors of Peripheral Nerves
6.1 Benign
6.1.1 Traumatic neuroma
6.1.2 Granular cell tumor
6.1.3 Benign peripheral nerve sheath tumor of the skin and subcutis [neurofibroma, schwannoma]
6.2 Malignant
6.2.1 Malignant peripheral nerve sheath tumor of the skin and subcutis [neurofibrosarcoma, malignant schwannoma]
7 Tumors of Synovium
7.1 Malignant
7.1.1 Synovial cell sarcoma
8 Tumors of Mesothelium
8.1 Intermediate
8.1.1 Mesothelioma
9 Mast Cell Tumors
9.1 Feline
9.1.1 Feline, "histiocytic"
9.2 Canine
9.2.1 Canine, grade I
9.2.2 Canine, grade II
9.2.3 Canine, grade III
9.3 Other species
10 Histiocytic Tumors
10.1 Benign
10.1.1 Canine cutaneous histiocytoma
10.1.2 Xanthoma
10.2 Intermediate
10.2.1 Cutaneous histiocytosis
10.2.2 Systemic histiocytosis
10.3 Malignant
10.3.1 Malignant histiocytosis
11 Miscellaneous Tumors
11.1 Benign
11.1.1 Calcinosis circumscripta
12 Unclassified Tumors
12.1 Malignant
12.1.1 Canine hemangiopericytoma
12.1.2 Malignant mesenchymoma
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