Won Hur

Adenoid cystic carcinoma of the maxillary antrum

PURPOSE To investigate characteristic clinical features and outcome for patients with adenoid cystic carcinoma (ACC) of the maxillary antrum. PATIENTS AND METHODS Twenty-two patients with ACC of the maxillary antrum were initially treated with surgery alone (3 patients), radiation alone (9 patients), or a combination of surgery and radiation (10 patients). Salvage treatment for initial failure was individualized. Patterns of failure, survival, and prognostic factors were retrospectively analyzed. RESULTS The most frequent site of failure was local recurrence at the primary site (72.7%). All patients treated with either surgery alone or radiation alone experienced one or more local recurrences, whereas patients who received planned combined surgery and radiation had a much lower local recurrence rate (40%). Neck node failure (4.6%) was an uncommon event, whereas distant metastases were clinically documented in seven patients (32%). Most of the treatment failures appeared within 5 years, but treatment failures after 5 years were not uncommon. The overall survival and disease-free survival rates at 10 years were 37.6% and 13.6%, respectively. Clinicopathological factors, such as location of primary tumor, tumor stage, and histological grade were of no value in predicting a favorable survival. The significant prognostic factors influencing 10-year survival were the pathological finding of perineural invasion and the initial mode of treatment. CONCLUSION ACC of the maxillary antrum represented a unique natural history characterized by a more aggressive tumor behavior and an unfavorable prognosis. Combined surgery and radiotherapy is recommended for optimal local control and survival.

Prognosis and Clinical Relevance of Recurrent Oral Ulceration in Behçet's Disease

There is no way of predicting whether a patient with recurrent oral ulcerations (ROU) will develop Behçets disease (BD). In the absence of a valid laboratory test to exclude BD, such oral ulcerations result in a diagnostic problem when they occur as the sole and earliest manifestation of disease.

Acral Darier's disease: Report of a case complicated by Kaposi's varicelliform eruption

We report a case of acral Dariers disease in a 16-year-old Korean boy that was complicated by Kaposis varicelliform eruption. It is uncommon in Dariers disease for dyskeratotic papules to be limited to acral areas. In our patient, Kaposis varicelliform eruption occurred on the face where there were no preexisting lesions of Dariers disease.

Cutaneous Reaction Induced by Retained Bee Stinger

The clinical features and histopathologic findings of a 54‐year‐old Korean male who had retained the sting apparatus of a bee for four months are described. The clinical features showed ulcerative, erythematous plaques with irregular borders which resembled cutaneous neoplasms such as squamous cell carcinoma. Histopathologic findings included epidermal necrosis and marked pseudoepitheliomatous hyperplasia. In the dermis, the stick‐shaped sting apparatus of the bee was demonstrated and intense lymphohistiocytic and eosinophilic infiltrations were noted.

Ichthyosis Bullosa of Siemens : Report of a Sporadic Case

We report a sporadic case of ichthyosis bullosa of Siemens occurring in a Korean boy. In this report, the varied findings of the clinical features in one subject over five years are presented along with an investigation of the ultrastructural alteration. The patient had suffered from blistering, superficial peeling, and dark‐grey colored lichenified patches on the extremities since infancy. As he grew older, the lesions were more localized to the elbows, knees, buttock and the dorsal aspects of the hands and feet, and were replaced by yellowish, lichenified plaques. Since the original report of Siemens in 1937, nine families including one sporadic case have been reported in the literature. To our knowledge, this is the second report of sporadic case of IBS.

Scalable distributed memory embedded system with a low-cost hardware message passing interface

In this paper, we propose a scalable distributed memory system with a low-cost hardware message-passing interface. The proposed interface improves the communication performance between nodes to decrease the overhead synchronization with a receiver reservation technique. The simulation results indicate that the performance is increased by 20% on 4x4 communications. The synthesis result of the proposed MPI indicates that the area was only 4.49% of each computing node. As a result, the proposed system is a useful embedded MPSoCs (Multiprocessor System on a Chip) for its low-cost implementation and scalability.

A Partial Access Mechanism on a Register for Low-Cost Embedded Multimedia ASIP

In this letter, we propose a partial access mechanism to be used on a register file for low-cost embedded multimedia processor architecture. In the embedded system, supporting the SIMD operations is a burden because of the wide SIMD register file and its execution unit. So a new architecture is proposed to increase the performance of SIMD operations with minimal additional hardware overhead. To evaluate the performance and hardware overhead, this architecture is adopted to an embedded multimedia processor and simulated with five DSP benchmarks. The simulation results indicate that the performance is increased by 38% and the total area is increased by 13.4%. The proposed partial access mechanism may be useful for low-cost embedded multimedia ASIP.