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www.reference.com/article/causes-tumors-dog-15c8fc0c6efb59b3

Some of the causes of tumors in a dog include old age, poor oral care and breed of the dog, explains WebMD. Dogs that have not been spayed also have a higher instance of mammary gland tumors.

www.reference.com/article/can-tumors-dog-treated-d7b3d6f4e4124ae3

Dog tumors can be treated, and the type of treatment largely depends on the type of tumor. There are three common types of tumors that affect dogs: fatty skin tumors also known as lipomas, benign (noncancerous) tumors and malignant tumors.

www.reference.com/article/causes-tumors-493227802420d301

Benign tumors are the result of abnormal cell growth that can be caused by factors such as radiation exposure, genetic mutations, infections, stress and trauma, explains WebMD. Cancerous tumors are caused by a traveling cancer cell in the body that damages tissues and begins dividing, notes Medical

www.reference.com/article/publishes-dog-tumor-images-3cad47e80d0fe65c

As of 2015, images of various types of tumors in dogs are available on the veterinary medicine section of About.com. The Long Beach Animal Hospital website devotes a page to images and information on mast cell tumors in dogs.

www.reference.com/article/types-brain-tumors-eba9b3883bded777

Some types of primary brain tumors include astrocytomas, oligodendrogliomas, ependymomas, meningiomas and schwannomas, explains the Department of Neurological Surgery at the University of Pittsburgh. There are also germ cell tumors, pineal tumors and craniopharyngiomas, as well as secondary brain tu

www.reference.com/article/common-types-brain-tumors-9cdb1d934c8efe4a

The most common types of brain tumors in adults are gliomas and astrocytic tumors, according to WebMD. In children, brain tumors are most commonly astrocytomas, states the National Cancer Institute.

www.reference.com/article/brain-tumor-bc8d0c82724f98ae

A brain tumor is tissue mass that is formed by abnormal cells, defines WebMD. Tumors do not die like normal cells do. Brain tumors can be both noncancerous or malignant. Cancerous brain tumors grow faster than noncancerous ones, and they attack surrounding tissue.

www.reference.com/article/symptoms-brain-tumor-e32404638af4a725

Symptoms of a brain tumor include unexplained nausea or vomiting, changes in behavior or personality, headaches that gradually increase in frequency and severity, and new onset or change in pattern of headaches, according to Mayo Clinic. Brain tumors may also cause vision problems such as double vis

www.reference.com/article/causes-brain-tumors-6143dfc9d0d13b63

Mayo Clinic indicates primary brain tumors are caused by normal cells that mutate to form a mass of abnormal cells in the brain. Secondary brain tumors are more common, and these types of tumors form after cancer from another part of the body spreads to the brain.

www.reference.com/article/types-stomach-tumors-46db994c17767a9

Some types of stomach tumors are adenocarcinomas, primary gastric lymphomas, GISTs, carcincoids and metastatic deposits, according to Florida Hospital Medical Center. Benign stomach tumors are classified as non-neoplastic and neoplastic.