VSR 421: Regional Veterinary Surgery (2+1)

MAMMARY NEOPLASIA

• Mammary neoplasia is the major surgical affection reported in small animal practice. The condition has high correlation with the effect of spaying or neutering age.
• Old un-spayed female dogs are highly susceptible to this condition and can proceed to either a benign or malignant tumor of the mammary gland. If the animal is neutered before 8 months of age the incidence is less than 0.2 %.

Surgical anatomy

• In Small animals especially, cats and dogs have five pairs of mammary gland and their blood supply and lymph drainage is listed in the following table

S.No	Gland	Blood Supply	Lymphatic drainage
1	Cranial thoracic	Inter-costal, Internal thoracic and lateral thoracic artery and veins	Axillary Lymph node
2	Caudal thoracic
3	Cranial Abdominal	Cranial and Superficial epigastric Vessels	Local lymph tract
4	Caudal Abdominal	Cranial and Superficial epigastric Vessels and Inguinal	Local lymph tract and Inguinal Lymphnode
5	Inguinal	Inguinal	Inguinal

Mammary tumor