Section: Information In-depth
Other conditions both benign and malignant can occur and are often confused with injection-site sarcoma. Following is a partial list of such swellings:
Subcutaneous abscess – a localized collection of pus in a cavity formed by the disintegration of tissue that is common in cats that roam and fight with other cats.
Infectious granuloma – an inflammatory mass associated with unusual bacteria or fungal infectious agents
Sterile granuloma – cat an inflammatory mass associated with administration of certain medications under the skin.
Panniculitis – cat the inflammation of the subcutaneous tissue
Steatitis – cat inflammation of subcutaneous fat
Epidermal inclusion cyst – cat a cyst in the outermost layer of skin derived from a hair follicle that has accumulated debris or fluid
Pilomatrixoma – benign tumor of the hair follicle
Sebaceous gland adenoma – cat a benign tumor of the glands that empty into the hair follicle
Other benign tumors
Chondrosarcoma – cat a malignant tumor derived from cartilage cells
Malignant fibrous histiocytoma – malignant tumor derived from tissue cells called histiocytes.
Mast cell tumor – malignant tumor derived from inflammatory tissue cells called mast cells
Lymphosarcoma – malignant tumor derived from immune cells called lymphocytes
Osteosarcoma – malignant tumor derived from bone cells
Rhabdomyosarcoma – malignant tumor derived from muscle
Sebaceous gland adenocarcinoma – malignant tumor derived from glands that empty into hair follicles
Apocrine gland adenocarcinoma – malignant tumor derived from sweat glands
Other malignant tumors
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