Plexiform schwannoma is a rare benign tumor originated from Schwann cell with low probabilities of becoming malignant. While it has a multi-nodular character compared to the original form, its nature can be confirmed by immunohistochemical studies such as S-100 protein stain. It is rare in the nasal cavity and therefore not many cases were reported in Korea. The authors present a case of plexiform schwannoma on the nasal vestibule with a size of 2 cm.

Surgery for thyroid disease is becoming much more common, but in some specialized institutions, ENT surgeons have difficulty obtaining experience of parathyroid surgery. Parathyroid disease can be divided into parathyroid adenoma with hyperparathyroidism and secondary hyperparathyroidism due to chronic kidney disease. Parathyroid adenoma with hyperparathyroidism is the most common cause of hypercalcemia and usually presents as nonspecific symptoms, such as, general weakness, osteoporosis, gastrointestinal disorder, kidney stones, and/or neurological symptoms, and thus, diagnosis is often delayed. Patients with secondary hyperparathyroidism due to chronic kidney disease require parathyroidectomy 10 years after the onset of dialysis in 6-10% of cases even when continuously treated in a nephrology department. Here, the authors share their experiences of parathyroid surgery.

Ranula refers to mucous retention cyst or mucocele that develops on the oral floor and it appears most frequently among oral masses derived from salivary glands. Ranula that is extended into submandibular space or into other cervical spaces due to defective mylohyoid muscle is particularly called plunging ranula. Various types of treatments have been conducted for ranula: surgical treatments such as simple excision, marsupialization, and removal of sublingual gland; and sclerotherapy utilizing OK-432 (Picibanil) are being reported. We performed concurrent excision of ranula and sublingual gland through intraoral approach. This technique leaves no post-surgical scars and shows very low recurrence rate and incidence rate of complications. Therefore, in this study, we would like to analyze the treatment methods and results of our patients.