Joo Hak Kim

Reliability of MRI Findings of Peroneal Tendinopathy in Patients with Lateral Chronic Ankle Instability

Background Patients with chronic lateral ankle instability also have peroneal tendinopathy often. However, preoperative MRIs of these patients are vague in many cases. Our study was performed to see the reliability of MRI findings of peroneal tendinopathy in patients with chronic lateral ankle instability. Methods MRI images for 82 patients who had chronic lateral ankle instability, and had received surgical treatment between March 2006 and November 2009 were compared with impressions from operating rooms. The mean age of patients was 36.4 years (range, 15 to 64 years), 82 ankles were studied, and patients with rheumatoid diseases were excluded from the study. Results Of the 82 cases, 26 were true positives, 38 true negatives, 13 false positives and 5 false negatives. Of 39 cases of peroneal tendinopathy diagnosed from MRI, 14 had peroneal tendon partial tears, 15 tenosynovitis, 3 dislocations, 17 low-lying muscle bellies, and 6 peroneus quartus muscles. Of 31 cases of peroneal tendinopathy observed in surgery 11 had peroneal tendon partial tears, 4 tenosynovitis, 5 dislocations, 12 low-lying muscle belliess, and 1 peroneus quartus muscle. Sensitivity and specificity of peroneal tendinopathy were 83.9% and 74.5%, respectively. Positive predictive value was 66.7%. Negative predictive value was 88.4%. Accuracy rate was 78.0%. Conclusions MRI is a useful diagnostic tool for detecting peroneal tendinopathy in patients with chronic lateral ankle instability. However, MRI is vague in many cases. Therefore, a thorough delicate physical examination and careful observation is needed.

Cosmetic improvement of nevus of Ota by scleral allograft overlay.

OBJECTIVE To report surgical outcome of a new therapeutic technique for nevus of Ota by scleral allograft overlay. DESIGN Noncomparative clinical interventional study. PARTICIPANTS Eight eyes of 7 patients with scleral nevus of Ota. METHODS Patients underwent subconjunctival scleral allograft overlay between September 2005 and June 2007 at Seoul National University Hospital. Preoperative neval extent, postoperative cosmesis, complications, and visual acuity change were evaluated. RESULTS Most of the patients showed satisfying cosmetic improvement. There were no significant complications in a follow-up period of more than 3 years. CONCLUSIONS Scleral allograft overlay is a safe and effective procedure for cosmetic improvement of nevus of Ota.

Imaging sonographic findings of in a case of proliferating trichilemmal tumor of a finger: A case report

Proliferating trichilemmal tumor (PTT) is a rare tumor that originates from the outer root sheath of a hair follicle. About 90% of PTTs occur on the scalp. The sonographic findings of PTT in the subungual region have not been reported previously. In our case, sonography showed a heterogeneous mass containing echogenic foci with no detectable intratumoral vascularity. These echogenic foci probably represent keratin and cholesterol.