Injection-Site Sarcoma (Vaccine-Site Sarcoma)

By: Dr. Debra Primovic

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Pet Lovers

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