Table 1.
Histological types, frequency, mean age (in years), and sex ratio for neoplastic and nonneoplastic tumors in the skin of dogs from Grenada, West Indies.
| Tumor type | Frequency | Mean age (yrs) | M : F |
|---|---|---|---|
| Hematopoietic tumors (n = 4) | |||
| Indolent plasmacytoma | 3 | 7.3 | 2 : 1 |
| Lymphoma | 1 | 6.0 | 0 : 1 |
| Epithelial and melanocytic tumors (n = 80) | |||
| (i) Tumors of the epidermis | |||
| Papilloma | 9 | 6.1 | 5 : 4 |
| Squamous cell carcinoma | 7 | 6.3 | 5 : 2 |
| (ii) Tumors with adnexal differentiation | |||
| Infundibular keratinizing acanthoma | 1 | 10.0 | 1 : 0 |
| Trichoepithelioma | 3 | 7.6 | 1 : 2 |
| Trichoblastoma | 4 | 6.0 | 3 : 1 |
| (iii) Sebaceous and modified sebaceous gland tumors | |||
| Hepatoid gland adenoma | 2 | 10.5 | 1 : 1 |
| Hepatoid gland carcinoma | 1 | 12.0 | 1 : 0 |
| Sebaceous epithelioma | 1 | 13.0 | 1 : 0 |
| Sebaceous adenoma | 1 | 10.0 | 0 : 1 |
| (iv) Apocrine and modified apocrine tumors | |||
| Apocrine adenoma | 1 | 13.0 | 1 : 0 |
| Apocrine adenocarcinoma | 2 | N. R | 1 : 1 |
| (v) Nail bed tumors | |||
| Subungual keratoacanthoma | 1 | 2.5 | 1 : 0 |
| (vi) Melanocytic tumors | |||
| Melanocytoma | 13 | 6.9 | 9 : 4 |
| Malignant melanoma | 5 | 8.9 | 3 : 2 |
| (vii) Cysts | |||
| Infundibular cyst | 4 | 5.6 | 2 : 2 |
| Dermoid cyst | 1 | N. R* | 1 : 0 |
| Isthmus cyst | 2 | 8.5 | 1 : 1 |
| (viii) Hamartomas | |||
| Sebaceous hamartoma | 1 | 13 | 1 : 0 |
| Fibroadnexal hamartoma | 3 | 10 | 2 : 1 |
| (ix) Tumor-like lesions | |||
| Sebaceous hyperplasia | 9 | 9.8 | 5 : 4 |
| Fibroepithelial polyp | 8 | 7.4 | 2 : 6 |
| Fibropruritic nodule | 1 | 4 | 1 : 0 |
| Mesenchymal tumors (n = 99) | |||
| (i) Tumors of vascular tissue | |||
| Hemangioma | 8 | 8.9 | 6 : 2 |
| Scrotal vascular hamartoma | 2 | 6.0 | 2 : 0 |
| Hemangiosarcoma | 31 | 8.3 | 19 : 12 |
| (ii) Histiocytic tumors | |||
| Histiocytoma | 14 | 4.7 | 7 : 7 |
| Malignant histiocytosis | 4 | 8.0 | 2 : 2 |
| (iii) Mast cell tumors | 11 | 7.3 | 8 : 3 |
| (iv) Tumors of fibrous tissue | |||
| Fibroma | 3 | 7.2 | 1 : 2 |
| Collagenous hamartoma | 4 | 7.6 | 2 : 2 |
| Fibrosarcoma | 9 | 6.7 | 3 : 6 |
| (v) Tumors of adipose tissue | |||
| Lipoma | 11 | 8.7 | 4 : 7 |
| Liposarcoma | 2 | 8.5 | 1 : 1 |
| Unclassified tumors (n = 14) | |||
| Hemangiopericytoma | 10 | 7.7 | 5 : 5 |
| Transmissible venereal tumor | 4 | 5.5 | 3 : 1 |
*N. R: Age not reported; M: Male; F: Female.