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J K Koh

Publications and source records attributed to J K Koh.

At least 19 recordsLinked to original sources
PubMed2001

Idiopathic eruptive macular pigmentation: report of 10 cases.

Idiopathic eruptive macular pigmentation (IEMP) is a rare disease. IEMP is characterized by asymptomatic, pigmented macules involving the neck, trunk, and proximal extremities. This study describes 10 cases of idiopathic eruptive macular pigmentation seen during a 9-year period at the Asan Medical Center, Seoul, Korea. We present these characteristic consecutive cases to provide more insight into the clinical picture and course of IEMP. Skin lesions of 8 patients were multiple brown macules involving the trunk, face, neck, and extremities. In 2 patients, multiple dark brown macules and patches were noted. The age of onset varied from 1 to 20 years. Tentative diagnoses were usually ashy dermatosis (erythema dyschromicum perstans), fixed drug eruption, or mastocytosis. The history of any erythema and drug medication was absent. Darier's sign was absent. Skin biopsy specimens showed increased pigmentation of the basal layer in an otherwise normal epidermis. Pigmentary incontinence, melanophages, and mild perivascular lymphohistiocytic infiltrate in the papillary dermis were also revealed. Mast cells could not be found. The lesions gradually disappeared during a period of several months to years. The alleged rarity of IEMP may be partially caused by medical unfamiliarity with this entity, despite its clinical and histopathologic characteristic picture. Treatment of IEMP is unnecessary because spontaneous resolution of the lesions can be expected within several months to a few years.

Adolescent↗
PubMed2001

Kaposi's sarcoma occurring during short-term dialysis: report of two cases.

Kaposi's sarcoma (KS) appears to develop in association with kidney transplantation, but unlikely with dialysis. We report two cases of classic KS that occurred in patients receiving short-term (less than 3 yr) dialysis. They have been suffering from chronic renal failure due to tuberculosis and diabetes mellitus, respectively. Several to multiple, reddened-violaceous patches, plaques and nodules were found on the hand and the lower extremities. Laboratory studies showed no evidence suggesting immunosuppressed state and there was no history of taking immunosuppressive agents. The biopsies of the two cases revealed proliferation of spindle-shaped cells focally arranged in bundles and multiple dilated vascular spaces outlined by an attenuated endothelium with intravascular and extravasated erythrocytes. The specimens expressed positivity with CD34 antigen. Human herpesvirus 8 (Kaposi's sarcoma-associated herpesvirus) was detected in one case by polymerase chain reaction method.

Aged↗
PubMed2000

A case of guttate psoriasis following Kawasaki disease.

We report a case of guttate psoriasis following Kawasaki disease, in a patient with Staphylococcus aureus demonstrated in a throat swab. We suggest that preceding staphylococcal infection can play a key role in the pathogenesis of some cases of guttate psoriasis, possibly by the production of superantigens.

Disease Progression↗
PubMed2000

Viral folliculitis on the face.

The common clinical presentations of herpes simplex virus (HSV) and molluscum contagiosum (MC) are well known to dermatologists. However, folliculitis due to these viruses is an infrequently reported entity and might be considered a sign of immunosuppression [such as infection with human immunodeficiency virus, (HIV)], especially in cases of folliculitis due to MC. The purpose of this study was to describe the clinical and histopathological characteristics of viral folliculitis due to HSV and MC. We retrospectively collected all our cases with histologically proven folliculitis due to HSV and MC between 1994 and 1999. A total of seven patients aged 7-54 years was identified. Prior to establishment of the diagnosis of folliculitis due to HSV and MC, they were treated with topical antibiotics or topical steroids, without improvement. Tentative diagnoses were bacterial folliculitis, syringoma, perifollicular fibrosis, contact dermatitis or pseudolymphoma. Biopsy of the lesions revealed multiple molluscum bodies in the follicular epithelium with sparing of the epidermis in four patients, and ballooning degeneration and intranuclear viral inclusions in the follicular epithelium in the other three. Three patients had evidence of underlying immune suppression, such as pregnancy, chronic viral hepatitis B and nasopharyngeal carcinoma. One patient had suffered from epilepsy for 4 years. Testing for HIV by enzyme-linked immunosorbent assay was negative in the four patients in whom this was performed, and T-cell subsets were normal in the three patients in whom these were quantified. In cases of molluscum folliculitis treated with simple curettage, the lesions cleared without scarring or recurrence. In cases of herpetic folliculitis, the lesions improved with antihistamines or acyclovir. MC or HSV should be considered in cases that present with folliculitis-like dermatoses but which are refractory to anti-infective and anti-inflammatory treatment.

Adolescent↗
PubMed2000

CD56 expression in a case of primary cutaneous CD30+ anaplastic large cell lymphoma.

We describe clinicopathological features of an unusual case of CD30+/CD56+ T-cell lymphoma in a 58-year-old Korean man who presented with disseminated nodules, papules and hyperpigmented patches. Coexpression of CD30 and CD56 in T-cell lymphoma is very rare. Our patient did not respond to an intensive chemotherapy regimen, in contrast to the previously reported cases of primary cutaneous CD30+ anaplastic large cell lymphoma. Coexpression of CD56 might therefore identify a subset of CD30+ lymphomas with more aggressive features.

Antigens, Neoplasm↗
PubMed2000

Clinicopathological features of CD56+ nasal-type T/natural killer cell lymphomas with lobular panniculitis.

Nasal-type T/natural killer cell lymphoma (TNKCL) shows frequent extranodal involvement including the skin, and is associated with a poor prognosis. We have studied six patients with nasal-type TNKCL presenting with inflammatory subcutaneous nodular lesions with a subcutaneous lymphoid infiltrate. Clinical information was obtained from the medical records of the patients and at follow-up. All cases showed features of angiocentric lymphoma on histology, although there was diffuse cellular infiltration rather than an angiocentric pattern in the subcutis. All six patients were similar in immunophenotype: positive for CD56 and either cytoplasmic CD3 or CD45RO, but negative for B-cell markers and CD30. In situ hybridization using an anti-sense Epstein-Barr virus early regions probe showed a positive reaction in all cases. All patients either died with progressive disease or showed no response to combined chemotherapy. The diagnosis of nasal-type TNKCL, which has a fatal outcome, is facilitated by detection of CD56-positive tumour cells. In evaluating lobular panniculitis including apparently benign inflammatory subcutaneous nodules, nasal-type TNKCL should be considered in the differential diagnosis, especially in Asian countries.

Adult↗
PubMed2000

Nasal and nasal type CD56+ natural killer cell/T-cell lymphoma: a case with rapid progression to bone marrow involvement.

We describe herein a case of CD56+ natural killer cell lymphoma (NKCL) that showed unusual clinical manifestations and a fulminant course of disease. A 70-year-old male patient presented with rapidly growing skin lesions and fever; a nasal lymphoma was subsequently detected and bone marrow involvement developed within a few weeks. Although the time relationship is not clear, bone marrow involvement could be dissemination from localized disease of nasal and nasal type NKCL. As seen in our case, the course can be excessively aggressive and fulminant even when it first appeared as a localized disease, and CD56 positivity, which is a specific characteristic of NKCL, may serve as a factor showing a poor prognosis for a malignant lymphoma.

Aged↗
PubMed2000

Linear eruptions of the nose in childhood: a form of lichen striatus?

We report four children with linear eruptions on the nose, with overlapping features of lichen striatus and linear cutaneous lupus erythematosus. However, linear lupus erythematosus has rarely been reported, and lichen striatus, although classically linear, rarely affects the face. The linear distribution of lesions from the glabella to the ala nasi may represent distribution following Blaschko's lines.

Adolescent↗
PubMed2000

Tinea pedis in Korean children.

BACKGROUND: Tinea pedis is an infrequent disease in children before the age of puberty. There are few epidemiologic and clinical data regarding cases of tinea pedis observed in children. Materials and methods We prospectively collected all cases of tinea pedis in children diagnosed during the years 1995-1997. Only those showing a positive result with potassium hydroxide preparation were included in the study. We performed fungal cultures in Sabouraud's agar in all cases to document the etiologic fungi. The clinical characteristics were investigated. RESULTS: A total of 21 children, aged 3 months to 14 years, were included. Fifteen patients were boys and six were girls. The mean age was 7.1 years. All the children were otherwise healthy. Prior to the establishment of the diagnosis of tinea pedis, 17 patients (80.9%) were treated for eczema without improvement. The intertriginous type was most common (53.3%). The first or second toe-webs were the sites of predilection (32.3%). Eighteen children (86%) had a family history of tinea pedis and more than half of cases (52.4%) showed occurrence in the summer. The results of fungal cultures were positive in 13 patients (57%). Trichophyton rubrum was the most commonly isolated pathogen (69.2%). The other associated dermatoses were onychomycosis (33.3%), atopic dermatitis (14%), plantar warts (10%), and chronic urticaria (5%). Tinea pedis and onychomycosis cleared after treatment with topical antifungals with or without systemic antifungals in all cases. CONCLUSIONS: Tinea pedis in children can occur more frequently than suspected. Our study shows the strong association with a family history and the seasonal relationship with occurrence in summer in more than half of cases. We suggest that tinea pedis should be considered in the differential diagnosis of foot dermatitis in children.

Adolescent↗
PubMed2000

Onychomycosis and Trichosporon beigelii in Korea.

BACKGROUND: Onychomycosis is a common superficial fungal infection. Causative organisms in onychomycosis have been extensively studied, but the role of nondermatophytes is controversial. Trichosporon beigelii is a soil and water inhabiting yeast and is occasionally found in the flora normally associated with human skin, mouth, and nails. Several reports in the literature have suggested that T. beigelii is one of the pathogens in onychomycosis. METHODS: We performed a survey of the mycologic laboratory records of patients clinically suspected of having onychomycosis from July 1996 to December 1998. RESULTS: Out of a total of 2591 nail samples examined, 1222 (47.2%) were culture positive, including 262 cases (10.1%) with T. beigelii. The overall positive rate for the KOH mount examination was 58.8%, and in the cases with T. beigelii was 89.1%. Among the age groups, the incidence rate was highest in the fifth decade (26.6%). The most common causative organism of microscopy-positive onychomycosis was Trichophyton rubrum (61.4%); the others in decreasing frequency were T. beigelii (20.4%), Candida spp. (7.3%), Trichophyton mentagrophytes (4.1%), and mixed infection (2.9%). T. beigelii was repeatedly isolated in successive nail cultures from 10 of 20 patients selected from those with T. beigelii nail infection. CONCLUSIONS: T. beigelii was the second most commonly isolated fungus in onychomycosis and had a high positive rate on KOH mount examination of the nails and successive repeated cultures. We suggest that T. beigelii might be a common pathogen of onychomycosis in Korea.

Adolescent↗