Introduction

Physicians can provide treatment protocol, such as a chemotherapy, or a surgery to animal owners when the physicians made a definitive diagnosis after cytological examination for some typical tumors. In other hands, they may miss a correct diagnosis due to some coexisting situation, such as an inflammatory reaction, or a blood dilution. The purpose of this lecture is to introduce these typical tumors and some unfavorable situations. These points will be demonstrated by related cases with macroscopic and microscopic photographs. Issues of tissue sampling techniques will be talked in the other sessions of this conference.

Typical tumors that can lead physicians to a definitive diagnosis:

 High grade lymphoma

 Low grade lymphoma in enlarged lymphatic node.

 Mastocytoma

 Histiocytic sarcoma

 Oral melanoma

 Anal sac gland carcinoma

 Squamous cell carcinoma at nail-bed

 Canine cutaneous histiocytoma and plasmocytoma

Hidden malignant tumors:

 Squamous cell carcinoma with intense ulceration

 Canine mastocytoma with intense inflammation and hemorrhage

 Hemangiosarcoma and thyroid carcinoma with severe blood dilution

 Intestinal lymphoma

 Hepatic lymphoma

Namba Veterinary Pathological Laboratory, Setagaya Kamiuma 4-2-9-1209, Tokyo, 154-0011, Japan, Email: BZG14356@nifty.com, Web page: http://homepage2.nifty.com/p-tuat-vet/namba/home.html