. Tumours, innocent and malignant; their clinical characters and appropriate treatment. Fig. 231.—Dermoid at the outer angle of the orbit. they lie in close relation with the pericranium covering thefrontal bone, which is often deeply hollowed to accommodatethem. Dermoids in this region vary somewhat in regard totheir position; sometimes they are quite close to the externalangular process of the frontal bone, or they may be 2 cm. ormore posterior to it (Fig. 231); exceptionally they are on alevel with, or even lie beneath, the eyebrow. 455 456 DERMOIDS Dermoids at the inner angle are far less
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. Fig. 231.—Dermoid at the outer angle of the orbit. they lie in close relation with the pericranium covering thefrontal bone, which is often deeply hollowed to accommodatethem. Dermoids in this region vary somewhat in regard totheir position; sometimes they are quite close to the externalangular process of the frontal bone, or they may be 2 cm. ormore posterior to it (Fig. 231); exceptionally they are on alevel with, or even lie beneath, the eyebrow. 455 456 DERMOIDS Dermoids at the inner angle are far less frequent (Fig. 232).In this situation the tumour may extend beyond the bone andlie in intimate relation with the dura mater. It is verynecessary to remember this in attempting the extirpation ofthe dermoid. In some cases the tumour may have a pedunclecontinuous with the dura mater. Under such conditions the. Fig. 232.—Dermoid at the inner angle of the orbit. dermoid may transmit the cerebral pulsation; it is then aptto be mistaken for a meningocele. Dermoids occur not only at the orbital angles, but some-times also in the tissue of the upper eyelid, unconnectedwith either bone or periosteum. These smaller dermoidsprobably arise in the fissure between the fronto-nasal plateand the cutaneous fold from which this eyelid is formed. Thefissure between the two parts which form an eyelid sometimespersists. To this defect the term coloboma of the eyelid isapplied. NASAL DERMOIDS 457 Dermoids arising in the orbital angles are the simplest ofall dermoids, and though the skin lining them is usually richin the ordinary cutaneous elements, such as hair, sebaceous andsweat- glands, complex structures such as teeth and bone, sofar as my knowledge extends, have not been observed in have satisfied myself that the skin in these dermoids issensitive and that it possesses tactile sensibility. Dermoi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
