. The diseases of children : medical and surgical. ar Cystic Growths of the Jaws arise from epithelialingrowths from the surface of the gum, which afterwards become shut off anddevelop cysts ; they may be congenital or occur in infancy. Besides these,two other forms of cyst are found associated with the teeth (dentary cysts) :(i) Cysts originating in connection with the tooth follicles—follicular, or, itthey contain teeth, dentigerous cysts: (2) Periosteal cysts, originating beneaththe periosteum of the jaw. Dentigerous cysts arise from mal-placed or mal-developed teeth, and mayoccur at any pa
. The diseases of children : medical and surgical. ar Cystic Growths of the Jaws arise from epithelialingrowths from the surface of the gum, which afterwards become shut off anddevelop cysts ; they may be congenital or occur in infancy. Besides these,two other forms of cyst are found associated with the teeth (dentary cysts) :(i) Cysts originating in connection with the tooth follicles—follicular, or, itthey contain teeth, dentigerous cysts: (2) Periosteal cysts, originating beneaththe periosteum of the jaw. Dentigerous cysts arise from mal-placed or mal-developed teeth, and mayoccur at any part of the jaws ; they contain clear, serous or glairy, white orcoloured fluid, rarely pus. Most often they are associated with the perma-nent, sometimes with the milk teeth. Eggshell crackling, the presence offluid, and suppression of a tooth are the common indications of the nature ofthese swellings. (Eve, Brit. Med. Jour., Jan. 6, 1883; Heath, Lancet,1887.) For further details on the question of tumours we must refer to thegeneral 204.—Lj-mphoma of the Neck. 777 CHAPTER XXXVII DISEASES OF THE THYROID AND THYMUS Acute Enlargement of the Thyroid.—A slight enlargement withtenderness of the thyroid gland is not uncommon, but any acute enlarge-ment, the result of inflammation, is very rare. A typical case of this kind isrecorded by Dr. T. Barlow, in a boy of three years. The symptoms at firstconsisted in pain in the neck on movement, feverishness and slight enlarge-ment of the thyroid gland. Later the swelling considerably increased ; thetemperature varied from ioo° to 103° F. ; there was some difficulty inswallowing, but no marked dyspnoea. In four or five days the swellingbegan to subside ; he finally made a good recovery. Chronic Enlarg-ement. Goitre.—Simple or cystic enlargement of thethyroid is sometimes met with in children, most commonly in the inhabitantsof certain hilly districts such as Derbyshire ; it is, however, met with in somecases among town-
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