. Tumours, innocent and malignant; their clinical characters and appropriate treatment. Fig. 70.—Excessive growth of hair on the caruncle, associated with an eccentricpupil. {After Semours.) or even the Avhole of it, were left uncovered, the exposedpart would persist as skin. This is precisely what the eyelid is in the condition of coloboma—a defectdue, in all probability, to the imperfect union of the em-bryonic eyelid to the skin covering the fronto-nasal plate— DERMOID PTERYGIUM 129 a piece of conjunctiva persists as skin, and forms a moleoccupying the gap in the Hd. Moles occur
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. Fig. 70.—Excessive growth of hair on the caruncle, associated with an eccentricpupil. {After Semours.) or even the Avhole of it, were left uncovered, the exposedpart would persist as skin. This is precisely what the eyelid is in the condition of coloboma—a defectdue, in all probability, to the imperfect union of the em-bryonic eyelid to the skin covering the fronto-nasal plate— DERMOID PTERYGIUM 129 a piece of conjunctiva persists as skin, and forms a moleoccupying the gap in the Hd. Moles occur on the con-junctiva unassociated with coloboma, but in nearly everyinstance they are situated on the cornea in the line of thepalpebral fissure. This circumstance would indicate thatduring development the conjunctiva was imperfectly coveredby the developing lids. In a few very exceptional cases. Fig. 71.—Dermoid pterygium in a sheep. the eyes have been found completely covered with skinwithout any traces of eyelids. Such a condition is knownas cryptophthalmos, and the explanation offered concerningit is, that in these cases the eyelids have failed to appear,and in consequence the conjunctiva has jjersisted as skin. Conjunctival moles have been observed in horses, sheep,oxen, and dogs, and are furnished with hair or wool,according to the nature of the tegumentary covering ofthe mammal in which they occur. CHAPTER XII NEUROMAS AND ALLIED CONDITIONS OF THENERVOUS SYSTEM Neuroma.—This may be defined as a tumour growingfrom, and in structure resemblino- the sheath of a nerve. The term neuromas is frequently used, especially inclinical work, as signifying tumours on nerves, but as suchtumours are sometimes composed of fibrous, fatt}^ or evensarcomatous tissue, it would be better to speak of themas lipomas of nerves, sarcomas of nerves, and so on. The tumours which most strictly
Size: 1607px × 1555px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
