[in Japanese]

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We have studied clinicostatistically the pediatric inpatients for the past 5 years in our hospital.
From this study, we obtained the following conclusions:
1) Total number of inpatients was 788, and 210 were pediatric inpatients. 121 were males and 89 females, with a male/female ratio of 1.3: 1.
2) The patients under 5 years of age occupied 65.2% of pediatric patients.
3) The following five diseases accounted for 98.4%: Congenital anomalies were 65.2% (137 cases), cysts 14.2% (30 cases), traumas 9.0% (19 cases) and inflammations 5.7% (12 cases) and tumors 4.3% (9 cases).

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Since partial deletion of the long arm of chromosome 18-del (18q) -was first published by de Grouchy et al in 1964, several cases have been reported.
Typical phenotypes present in this syndrome with partial monosomy for chromosome 18 carries with dwarfism, muscular hypotonia, a peculiar dysmorphia of the ears and midface hypoplasia, beeing lunar face.
In our case untypical case of del (18) syndrome with complete cleft lip and palate carries with it high value of Ig-G, Ig-A, and Ig-M.

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Injuries of oral soft tissues often occur in children. Injuries occur at the palate, the tongue and the buccal mucosa in most of the cases, and are due to falling down with chopsticks or a toothbrush etc. in the mouth. Usually the extent of the injuries are superficial and serious cases are rare.
We experienced two cases in which the foreign bodies penetrated into the buccal mucosa.
Case I: A 1-year-old boy fell down with a chopstick in his mouth, and the point of the chopstick penetrated into his left buccal mucosa. The foreign body was 45mm in length.
Case II: A 4-year-old boy fell down outdoors, and a bamboo stick penetrated into his left buccal soft tissue through the left buccal skin. The foreign body was 22mm in length.

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Pleomorphic adenoma usually occurs after 30 years of age, but is few in childhood.
We experienced a case of pleomorphic adenoma appearing in the sublingual gland of a child. The patient was a 13-year-old girl. She visited our clinic with a complaint of a tumor on the left mouth floor and a diffuse swelling on the left submandibular region. There was a mass in size of the tip of a thumb in the left mouth floor. It was easily movable, roundish and had smooth surface. The tumor was removed under general anesthesia. The removed mass (25×30×22mm) was oval and well encapsulated, and the cut surface was yellow-grey and solid.
Histopathological diagnosis was pleomorphic adenoma.

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Two cases of hemangioma occured on the upper lip of baby were reported. The tumors were successfully reduced using Nd: YAG laser that has the advantage of coagulation of the tissue and hemostatic effect.
Case 1 was a 3-month-old male baby with a chief complaint of swelling of upper lip. The tumor was cauterized by electric surgical knife under general anesthesia and then a sclerosing agent was injected (six times, total 4.5ml) for two months. But after two years, the tumor was regrown and was reduced using Nd: YAG laser under general anesthesia.
Case 2 was a 1-month-old male baby with a chief complaint of swelling of the upper lip. In this case the tumor was reduced using Nd: YAG laser under general anesthesia. But the after four months tumor had grown, and it was again reduced under general anesthesia by Nd: YAG laser.
Histopathological diagnosis of the cases were booh capillary hemangioma.

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Epidermoid cysts are commonly found throughout the body. In the oral regions, they usually appear in the floor of the mouth. As they grow, they may displace the tongue upward causing various speaking and eating difficulties. Therefore, adequate treatment of the cysts should be done immediately.
We found an epidermoid cyst in the floor of the mouth of a 9-year-old boy by school dental examination. The patient became aware of his sublingual swelling about six months prior to the examination. Although his teacher pointed out his unclear pronunciation, the patient evaded to mention the swelling. We removed the cyst under general anesthesia. In this way, we quickly remedied the patient's speaking and eating problems.
By this experience it was strongly suggested that not only school dentists, but also all dentists should always examine whole oral cavity precisely as well as the teeth.

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Dentigerous cyst is one of the odontogenic cyst which is sprung in the jaw.
An uncommon case of dentigerous cyst was reported, in which the cysts were located bilaterally and symmetrically in the mandible.
The patient was 11-year-old girl with dentigerous cysts occurred symmetrically in the lower premolar region of both sides.
Fenestration was performed for the both cysts.
According to the histopathological examination the cyst walls were consisted of squamous epithelium.
The suceeding 2nd premolars have erupted normally and the occlusion is stable.
There was no evidence of resorption of the tooth roots and the jaw bone.

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This is a report of a rare case of soft tissue injury caused by a toothbrush. Recently, a 2-year-old boy with a toothbrush stuck in his right buccal mucosa consulted us. Under local anesthesia the brush was removed. The wound was treated accordingly and left open. The wound healed without serious complication.

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