NON NEOPLASTIC MASSES of CANINE SKIN

 

Soft Tissue Nonneoplastic Masses

Collagenoma

 

 

Seroma

 

Hypertrophic scar

 

Cysts

Nevi and Hamartoma

Cutaneous horn

Linear organoid nevus

 

There is a case report about a dog with a linear mass composed of sebaceous glands.

Warty dyskeratoma

Seborrhiec keratoma

Sebaceous nodular hyperplasia

 

Mixed Epithelial and Soft tissue Nonneoplastic masses

Nevi and Hamartoma

Pilar neurocristic hamartoma

This hamartoma derives its name from a hair follicle (pilar) and mesenchymal cells of the neural crest, usually with spindle cells, Schwann cells, pigmented dendritic cells and or melanocytes.They are often pigmented in appearance. They are multifocal/multinodular.

 

Anderson WI, Luther PB, Scott DW. Pilar neurocristic melanoma in four dogs. Vet Rec. 1988; 123: 517-518.

Smooth Muscle Hamartoma

Well demarcated and expansile nodules of smooth muscle that form a mass in the dermis is a smooth muscle hamartoma. These are derived from the arrector (erector) pili muscle.

 

Liu SM, Mikaelian I. Cutaneous Smooth Muscle Tumors in the Dog and Cat. Vet Pathol 2003; 40: 685–692