There are three forms of bovine lymphosarcoma described in cattle: 1) The cutaneous form commonly affects cattle under 3 years old and presents as skin plaques on the neck, back, and thighs that develop thick scabs and shrink and regrow over weeks or months. 2) The juvenile form commonly affects calves from 2 weeks to 6 months of age and causes sudden lymph node enlargement and gradual weight loss, depression, and weakness. 3) The thymic form commonly affects cattle from 6 to 24 months of age and is characterized by thymus enlargement, lymph node enlargement, and respiratory obstruction.

6. 1-cutaneous form → common in cattle less than 3 years of old
*ch` by:
-cutaneous plaques (5-10 cm) on neck , back & thigh
-the plques covered by thick gray white scab then the
nodules →shrink & after aperiod of weeks or month → grow
again
2-Juvenile form (calf lymphosarcoma) → common in calves of 2
weeks to 6 month of age
*ch` by:
-sudden enlargement of L.N
-gradual loss of B.wt , depression & weakness
3-thymic form → common in young cattle 6-24 month of age
*ch` by:
-enlargement of thymus
-enlargement of regional L.N
-respiratory obstruction

7. 1-cutaneous form → common in cattle less than 3 years of old
*ch` by:
-cutaneous plaques (5-10 cm) on neck , back & thigh
-the plques covered by thick gray white scab then the
nodules →shrink & after aperiod of weeks or month → grow
again
2-Juvenile form (calf lymphosarcoma) → common in calves of 2
weeks to 6 month of age
*ch` by:
-sudden enlargement of L.N
-gradual loss of B.wt , depression & weakness
3-thymic form → common in young cattle 6-24 month of age
*ch` by:
-enlargement of thymus
-enlargement of regional L.N
-respiratory obstruction