. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DEPARTMENT BULLETIN No. 1449. Washington, D. C. October, 1926 TUMORS OF DOMESTIC ANIMALS By Robert J. Formad, Associate Pathologist, Pathological Division, Bureau of Animal Industry CONTENTS Page Introduction 1 Etiology i__ 2 The constitutional dysd'asia or diathesis theory 3 The mechanical or irritation theory 3 The " embryonal rests " or pre- formation theory 3 The theory of nervous influence- 4 The parasitic theory 4 Classification of neoplasms 4 Classification by nature (clin- ical classification) 5 Class
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DEPARTMENT BULLETIN No. 1449. Washington, D. C. October, 1926 TUMORS OF DOMESTIC ANIMALS By Robert J. Formad, Associate Pathologist, Pathological Division, Bureau of Animal Industry CONTENTS Page Introduction 1 Etiology i__ 2 The constitutional dysd'asia or diathesis theory 3 The mechanical or irritation theory 3 The " embryonal rests " or pre- formation theory 3 The theory of nervous influence- 4 The parasitic theory 4 Classification of neoplasms 4 Classification by nature (clin- ical classification) 5 Classification by structure (his- togenetic classification) 6 Classification by shape (morpho- logical classification) 7 Nomenclature 8 Connective-tissue neoplasms 8 Fibroma 8 Lipoma 10 Xanthoma 11 Myxoma 11 Chondroma 12 Chordroma 13 Osteoma 13 Odontoma 14 Myeloma 15 Myoma 15 Rhabdomyoma 16 Neuroma 17 Page Glioma IS Angioma ID Lymphangioma 20 Lymphoma 20 Leukemic lymphoma 21 Pseudoleitkemic lymphoma 21 Sarcoma 21 Spindle-cell sarcoma 23 Round-cell sarcoma 24 Lymphosarcoma 25 Alveolar sarcoma 25 Giant-cell or myeloid sarcoma- 26 Osteosarcoma 26 Melanotic sarcoma 26 Combinations of sarcomas 27 Endothelioma 27 Epithelial neoplasms 28 Papilloma 28 Adenoma 20 Carcinoma 30 Squamous epithelioma 31 Cylindrical epithelioma 32 Glandular carcinoma • 33 Combinations of carcinoma 35 Distinction between carcinoma and sarcoma 38 Teratoid neoplasms (teratoma) 37 Dermoid cvst 37 Cysts 38 Syncvtioma 39 Literature cited 39 INTRODUCTION A tumor is an atypical, abnormal growth of tissue, developing without apparent cause, having no function, and growing independ- ently of the laws that govern the growth of the body. Until the true cause of tumors is known no satisfactory definition can be given, as can be seen from the fact that every prominent authority on tumors has given a different definition of a tumor, depending on the particular angle from which his studies were undertaken. Tumors are comparati
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