4. Laryngoscope, 127:E42-E49, 2017.

Since the sub-prime mortgage crisis from the US in 2008, Korean housing market has plummeted. However, Korean local lease contract, Chonsei, price has been increasing. This increase of Chonsei price can be a threat to the low-income people because most of them prefer to live at the house with a Chonsei contract. In order to solve this problem, the Korean Government implemented several Chonsei policies to secure low-incomers'residence by decreasing the price of Chonsei; however, due to the lack of understanding on housing and Chonsei market, Korean government policy seemed to fail on getting effective results. In the housing and Chonsei market, there are many stakeholders with their own interest, hence, simple thoughts about housing and Chonsei market, such as more house supply will decrease house price, would not work in a real complex housing market. In this research, we suggests system dynamics conceptual model which consists of causal-loop-diagrams for the Chonsei market as well as the housing market. In addition, we tries to explain why the policy did not work effectively using the examples from the government' s past measures. In results, Chonsei price has its own homeostasis characteristic and different price movement with housing price in the short and long term period. Unless government does not have a structural causation mind in implementing policies in the real estate market, the government may not attain intended effectiveness on both markets.

Cavernous sinus syndrome (CSS) is defined as the involvement of two or more of the third, fourth, fifth (V1, V2) or sixth cranial nerves or involvement of only one of them in combination with a neuroimaging-confirmed lesion in the cavernous sinus. Some cases of CSS are attributed to Tolosa-Hunt syndrome (THS), an idiopathic inflammatory disease of the cavernous sinus. THS is characterized by painful ophthalmoplegia due to granulomatous inflammation in the cavernous sinus. THS is a diagnosis of exclusion that requires a vigorous series of differential diagnoses, and corticosteroid therapy is known to dramatically resolve clinical findings of THS. We report a case of a patient with painful ophthalmoplegia associated with vision loss, which was suspected to be THS. This patient followed a relatively typical clinical course of THS on steroid pulse therapy. We emphasize the differential diagnosis of THS, its presentation, and treatment.KEY WORDS: Tolosa-hunt syndromeㆍVision lossㆍHigh dose steroids.

Erdheim-Chester disease (ECD) is a rare form of non-Langerhans cell histiocytosis with multi-organ involvement. Bones, cardiovascular system, central nervous system, kidney, skin and many different organs can be involved but laryngeal involvement has not been reported in literatures. The diagnosis of ECD was based on clinical manifestations and immunohistochemical findings including CD68(+), CD1a(-) and S100(-). Currently, Interferon-a is the most extensively studied agent in the treatment of ECD and serves as the 1st line of treatment. Surgical resection of involved lesions can be tried but it leads to temporary improvement. A 60-year-old man visited with respiratory symptoms because of ECD with laryngeal involvement. We resected the obstructive lesion to relieve the symptoms. Tissue biopsy gave a diagnosis of ECD. As it is rare to encounter ECD involving the larynx, we report this case with a review of literatures.