8 BULLETIN 1449, U. S. DEPARTMENT OF AGRICULTURE 
7. Polyps (pedunculated growth) : Myoma, soft fibroma, sometimes also 
lipoma, adenoma. 
8. Papillae (dermic growth) : Corns, cutaneous horns. 
9. Dendrites (branching or cauliflowerlike growth) : Warts, papilloma, 
epithelioma. 
10. Cysts (saclike or bladderlike neoplasms ) x : Glandular cystoma, papillary 
cystoma. 
NOMENCLATURE 
In naming a neoplasm the root word of the tissue of which the 
neoplasm is composed is used with the addition of the Greek word 
" oma," signifying tumor or neoplasm. Thus the names fibroma, 
myoma, osteoma, neuroma, angioma, and other similar ones are 
obtained. An exception is made in naming a group of neoplasms, 
which from their resemblance to flesh (sarko) are known as sar- 
comas, and also in designating another group of neoplasms, having 
the fanciful resemblance to a crab (karkinos), are called carcinomas. 
CONNECTIVE-TISSUE NEOPLASMS 
FIBROMA 
Definition. — A fibroma is composed of fibrous connective tissue, 
which it resembles in structure and arrangement, but presents some 
differences in its finer composition. Originating from the meso- 
derm, the connective tissue has a wide distribution and a marked 
difference in the arrangement and grouping of the fibers. The 
bundles may be arranged loosely, as in the areolar tissue and in 
the submucous tissue in mucous membranes, or the bundles may be 
very compactly arranged, as in the periosteum, fascias, and tendons. 
Seats. — The wide distribution of connective tissue makes it pos- 
sible for fibromas to start and grow in any part of the body, but 
there are certain places in which they grow with preference. Some 
of the more common places are the skin and the subcutaneous con- 
nective tissues of the chest. Fibromas are often found in the chests 
of horses and in the dewlaps of cows. 
They may be found at times in the region of the throat and neck 
in cattle and horses as well as in other animals. The extremities, 
especially about the knee and elbow, are comparatively common 
places to find fibromas in cattle, horses, and dogs. The tail in cattle 
is also a frequent seat of hard fibromas. Care must be taken, how- 
ever, to differentiate the hard, fibromatous nodules on the tail from 
nodular formations which may be tuberculous or actinomycotic in 
nature. 
Less frequently fibromas are found in other locations, as the 
" fibroma diffusum " involving the muzzle of cattle, where it may 
become as extensive in size as the muzzle itself. Polypoid or pe- 
dunculated fibromas are found in the nose, pharynx, and larynx in 
cattle and horses. In the latter locations they have been known to 
cause fatal results by obstructing respiration. Other sites for poly- 
poid fibromas are the uterus, vagina, and ovary in cows, mares, and 
bitches. In these latter localities the neoplasm assumes a more pe- 
dunculated shape, is harder, and may be many times larger than 
the comparatively small, soft, edematous nasal polypi. The tongue 
is also one of the rare seats of fibroma. The tumor usually grows 
near the upper surface without encroachment on the mucous mem- 
