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Table 1 Histopathological diagnosis, relative frequency, and occurrence rate of CCT recorded in the database of ICBAS Pathology Lab (total population = 2,291 dogs)

From: Retrospective study of canine cutaneous tumors submitted to a diagnostic pathology laboratory in Northern Portugal (2014–2020)

DIAGNOSIS NUMBER OF CASES RELATIVE FREQUENCY
(% OF ALL SKIN TUMORS)
EPITHELIAL TUMORS 339 28.61
EPIDERMAL TUMORS 60 5.06
BASAL CELL CARCINOMA 6 0.51
PAPILLOMA 22 1.86
SQUAMOUS CELL CARCINOMA 32 2.70
HAIR FOLLICLE TUMORS 69 5.82
INFUNDIBULAR KERATINIZING ACANTHOMA 10 0.84
TRICHOLEMMOMA 2 0.17
TRICHOBLASTOMA 20 1.69
TRICHOEPITHELIOMA 27 2.28
PILOMATRICOMA 6 0.51
SUBUNGUAL KERATOACANTHOMA 3 0.25
SEBACEOUS GLAND TUMORS 96 8.10
SEBACEOUS ADENOMA 62 5.23
SEBACEOUS EPITHELIOMA 34 2.87
APOCRINE GLAND TUMORS 18 1.52
APOCRINE ADENOMA 8 0.68
APOCRINE CARCINOMA 6 0.51
HEPATOID GLAND TUMORS 88 7.43
HEPATOID ADENOMA 57 4.81
HEPATOID EPITHELIOMA 14 1.18
HEPATOID CARCINOMA 10 0.84
HEPATOID NEOPLASM 7 0.59
EPITHELIAL TUMORS NOS 8 0.68
ADENOCARCINOMA 1 0.08
CARCINOMA NOS 4 0.34
MELANOCYTIC TUMORS 43 3.63
MELANOCYTOMA 23 1.94
MELANOMA 20 1.69
MESENCHYMAL TUMORS 311 26.24
BENIGN SOFT TISSUE TUMORS 115 9.70
LIPOMA 86 7.26
INFILTRATIVE LIPOMA 6 6.98
FIBROMA 25 2.11
MYXOMA 3 0.25
SOFT TISSUE SARCOMAS 90 7.59
FIBROSARCOMA 2 0.17
PERIVASCULAR WALL TUMOR 20 1.69
PERIPHERAL NERVE SHEATH TUMOR 39 3.29
LIPOSARCOMA 2 0.17
SARCOMA NOS 21 1.77
SINOVIAL SARCOMA 3 0.25
MYXOSARCOMA 3 0.25
VASCULAR TUMORS 94 7.93
HEMANGIOMA 68 5.74
LYMPHANGIOMA 3 0.25
HEMANGIOSARCOMA 23 1.94
MUSCULOSKELETAL TUMORS 8 0.68
OSTEOSARCOMA 4 0.34
MESENCHYMAL NEOPLASM NOS 3 0.25
HEMOLYMPHATIC TUMORS 357 30.13
MAST CELL TUMORS 269 22.70
MAST CELL TUMORS NOC 4 0.34
CUTANEOUS MAST CELL TUMORS 244 20.59
SUBCUTANEOUS 21 1.77
PLASMOCYTIC TUMORS 18 1.52
PLASMOCYTOMA 17 1.43
LYMPHOMAS 6 0.51
T- CELL LYMPHOMA 2 33.33
HISTIOPROLIFERATIVE DISORDERS 61 5.15
HISTIOCYTOMA 58 4.89
HISTIOCYTIC SARCOMA 3 0.25
ROUND CELL NEOPLASM NOS 3 0.25
HAMARTOMAS 56 4.73
HAMARTOMA 56 4.73
TUMOR LIKE LESIONS 71 5.99
ACROCHORDON 71 5.99
CUTANEOUS NEOPLASM NOS 8 0.68
UNDIFFERENTIATED MALIGNANCY 8 0.68
  1. NOS—not otherwise specified
  2. NOC—not otherwise classified