Midodrine-induced acute generalized exanthematous pustulosis.

Acute generalized exanthematous pustulosis (AGEP) is an acute sterile pustular eruption most commonly induced by medications. We present a case of AGEP with erythroderma following use of midodrine in a 58-year-old man. Although antibiotics are most commonly implicated in AGEP, we emphasize that nonantibiotic agents also may cause AGEP, which often manifests after a longer time interval compared to antibiotic-associated AGEP.

Subcutaneous histiocytoid Sweet's syndrome in a patient with myelodysplastic syndrome and acute myeloblastic leukemia.

Subcutaneous histiocytoid Sweet's syndrome is a rare variant of histiocytoid Sweet's syndrome (SS). We present a 68-year-old woman with subcutaneous histiocytoid SS in association with refractory myelodysplastic syndrome transformed to acute myeloblastic leukemia (AML), status post induction chemotherapy and with persistent blasts (50%) in the bone marrow and blood, accompanied with neutropenia. The patient presented to the emergency room with fever and altered mental status. Clinical examination revealed approximately 20 scattered 0.5-2 cm, pink to pink-purple non-tender firm nodules on the legs and left arm. The differential diagnosis included Sweet's syndrome (deep), leukemia cutis, infection, polyarteritis nodosa and erythema nodosum. Histopathologic examination of a biopsy from the left arm revealed a nodular infiltrate of neutrophils and histiocytoid mononuclear cells solely in the lobular compartment of the subcutaneous fat with focal areas of necrosis. Most cells in the infiltrate labeled with myeloperoxidase (MPO) including the histiocytoid cells. The cells were negative for CD34 and CD117. All special stains for microorganisms were negative. A diagnosis of subcutaneous histiocytoid SS was made. A subcutaneous histiocytoid SS should be suspected when a neutrophilic/histiocytoid panniculitis, occurring in the setting of myeloid disorders, is encountered and after exclusion of an infectious process and leukemia cutis.

Expanding the histologic findings in smallpox-related post-vaccinial non-viral folliculitis.

Post-vaccinial non-viral folliculitis has been recognized in the past decade as a new adverse cutaneous reaction to smallpox vaccination. Contrary to more serious smallpox vaccine reactions, post-vaccinial non-viral folliculitis has a benign course and resolves spontaneously within approximately 7 days. We describe additional histopathologic findings associated with post-vaccinial non-viral folliculitis, which has only been described once previously. New findings include the presence of a neutrophilic or lymphohistiocytic infiltrate that is concentrated around the hair follicles. We compare our findings to the follicular nature of varicella and herpes zoster infections, generating the hypothesis of deposition of vaccinia protein within folliculosebaceous units as a potential pathophysiologic mechanism behind post-vaccinial non-viral folliculitis.

Nondermatologists' use of predictive terms for a potentially malignant lesion.

BACKGROUND: Skin cancer is frequently suspected by nondermatologists. Many dermatology practices currently do not triage referrals from nondermatologists. Little is known how nondermatologists describe lesions of concern when making referrals. OBJECTIVE: We sought to assess the descriptive terminology used by nondermatologists when referring patients with potential cutaneous malignancies. METHODS: We completed a retrospective chart review of 400 patients referred by nondermatologists for skin lesions suspicious of malignancy. We collected the reason for the consult, all terminology used to characterize the lesion, and the final diagnosis. RESULTS: Clinicians documented 680 reasons for referring patients with suspicious lesions. General concern (rule out malignancy) without specific descriptors was used in 78 referrals, of which 23% (n = 18) were found to be associated with malignancy. Specific descriptive terminologies used most frequently by nondermatologists to describe suspicious lesions were: hyperpigmented (n = 71), changing size (n = 69), nonhealing (n = 55), irregular border (n = 52), irritated and/or scaly (n = 40), and raised (n = 33). A statistically significant correlation (P < 0.05) was found between skin cancer and the following terms: nonhealing, ulcerated, and rule out basal cell carcinoma. CONCLUSION: The descriptive terminology of potential cutaneous malignancies utilized by nondermatologists may provide important clues to aid dermatologists in triage decisions. Specifically, ulcerated, nonhealing, and rule out basal cell carcinoma may be terms that indicate the patient should be seen by the dermatologist in a timely manner.

Outcomes of referral to dermatology for suspicious lesions: implications for teledermatology.

OBJECTIVES: To determine the proportion of suspicious lesions referred by nondermatologists that are found to be malignant and the number of incidental skin cancers identified at the time of dermatology referral. DESIGN: Retrospective cohort study. SETTING: Veterans Affairs Connecticut Healthcare System. PATIENTS: Four hundred patients referred by nondermatologists for skin lesions suspected of being malignant between January 1, 2006, through December 31, 2009. MAIN OUTCOME MEASURES: Data collected included the type of referring provider, the final diagnosis by the dermatologist, and the number and type of incidental lesions. RESULTS: Only 22.0% of the index lesions (ie, the lesions that prompted the referral) were found to be cancerous. In aggregate, 149 cancerous lesions were noted in 98 patients. However, only 88 (59.1%) were identified in the index lesion; 111 incidental lesions were biopsied by the consulting dermatologist, with 61 (55.0%) additional skin cancers identified. Twelve of the 61 incidental cancers (19.7%) were found in patients whose index lesion was clinically benign and was not biopsied. CONCLUSIONS: Nondermatologists may benefit from focused educational initiatives on skin cancer detection, particularly the significance of the total body skin examination and the expectations for and limitations of teledermatology. A substantial proportion of malignant lesions was incidentally identified by the consulting dermatologist in addition to the primary lesion of concern. The use of teledermatology to assess a specific lesion of concern may be associated with underdiagnosis of clinically significant lesions that are not appreciated by the referring physician. Therefore, teledermatology must not be used as a substitute for a total body skin examination.

White piedra in children.

BACKGROUND: White piedra is a fungal infection of the hair shaft caused by species of Trichosporon. Rarely has this infection been reported in the United States. Historically, infected individuals required shaving of their hair to achieve clearance of the infection. OBJECTIVE: We sought to describe 8 cases of Trichosporon scalp infections seen in the northeastern United States. METHODS: We conducted chart review and prospective evaluation of 7 girls and 1 boy seen in two dermatology practices in New Haven, Conn, and New York, NY. RESULTS: Seven girls, ages 4 to 16 years old, and one 4-year-old boy were determined to have Trichosporon scalp infection, all through culture. Of the 8 children who were available for follow-up, 7 had clearance of their infection with a combination of oral azole antifungal medication and azole antifungal shampoo, without shaving the scalp hair. LIMITATIONS: This was a sample of patients from a localized region of the United States. CONCLUSIONS: White piedra is emerging as a commonly seen hair and scalp infection in the northeastern United States. Contrary to prior publications, scalp and hair infection may be successfully treated with a combination of oral azole antifungals and shampoos without shaving the scalp.

Cross-comparison of patch test and lymphocyte proliferation responses in patients with a history of acute generalized exanthematous pustulosis.

An adverse cutaneous reaction to a systemically administered drug may rarely manifest as acute generalized exanthematous pustulosis (AGEP). Several recent reports have documented positive patch test results in patients with a history of AGEP, while two have demonstrated drug-specific in vitro lymphocyte proliferative responses. These findings suggest that drug-specific T cells mediate AGEP. We describe two patients with a history of AGEP who each demonstrated positive patch test results specific for the inciting drug: Patient #1 to the antibiotic metronidazole, and Patient #2 to the calcium channel-blocker diltiazem. Histologic examination of biopsy specimens taken from the patch test sites of these patients revealed spongiotic dermatitis and perivascular lymphocytes consistent with a delayed-type hypersensitivity reaction, rather than demonstrating subcorneal neutrophilic pustules more typical of AGEP. In vitro testing by measuring peripheral T cell proliferative responses to chemically purified drug correlated with the clinical response. In a direct cross-comparison, patch test results were shown to correlate with in vitro lymphocyte proliferative responses in two patients with a history of AGEP to different drugs. These findings provide additional evidence that the pathogenesis of AGEP involves a T cell-mediated immune response.

Two men with toxic shock syndrome presenting with targetoid and spotty skin rashes.

Two previously healthy men who presented with hypotension, constitutional symptoms, and targetoid and discrete spotty erythematous plaques were diagnosed with toxic shock syndrome based on histopathological findings. Specifically, their biopsies revealed necrotic keratinocytes, neutrophils in the epidermis, and neutrophils surrounding dilated superficial vessels. In one case, the diagnosis of toxic shock syndrome was confirmed with rising titers to toxic shock syndrome toxin-1. Both patients recovered with supportive care and clindamycin administration. We suggest that patients with fever, hypotension, constitutional symptoms and rash should be started on clindamycin and have a skin biopsy as part of their initial evaluation. An understanding that toxic shock syndrome can strike anyone has manifold dermatological manifestations and defined histopathological findings is important for its early diagnosis and effective treatment.