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Symmetrical Drug-Related Intertriginous and Flexural Exanthema Secondary to Topical 5-Fluorouracil

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Symmetrical Drug-Related Intertriginous and Flexural Exanthema Secondary to Topical 5-Fluorouracil Symmetrical Drug-Related Intertriginous and Flexural Exanthema Secondary to Topical 5-Fluorouracil Roxann Powers, MD; Rachel Gordon, MD; Kenrick Roberts, MD; Rodney Kovach, MD We report the case of a 56-year-old man who fossae and axillae. His dermatologist stopped the developed a distinctive skin eruption after treat- 5-FU and started prednisone, erythromycin, hydro- ing actinic keratoses on the dorsal aspects of cortisone ointment, and fexofenadine hydrochloride. his right and left hands with topical 5-fluorouracil Over the next week, the areas became eroded and the (5-FU). The distribution of his rash was charac- pain worsened. A biopsy was performed. The hydro- teristic of symmetrical drug-related intertriginous cortisone was discontinued and he was referred for a and flexural exanthema (SDRIFE), also known as second opinion. baboon syndrome. Medications at presentation included erythromycin, Cutis. 2012;89:225-228. fexofenadine hydrochloride, acetaminophen-codeine, CUTISprednisone, petrolatum ointment, metformin Case Report hydrochloride, enalapril maleate, ranitidine hydro- A 56-year-old man with a history of diabetes mel- chloride, simvastatin, triamterene/hydrochlorothiazide, litus, hypertension, hyperlipidemia, reflux, squamous aspirin, and omeprazole. He reported no cell carcinoma in situ of his right hand, and actinic known allergies. keratoses of the right Doand left hands presentedNot with a PhysicalCopy examination revealed an overweight painful, burning, pruritic, erythematous, and blister- man who appeared agitated and reported substantial ing rash on his medial thighs, scrotum, penis, antecu- discomfort. He had well-demarcated, violaceous, red bital fossae, axillae, and dorsal hands. The patient had erosions on his medial thighs (Figure 1), scrotum, a successful history of treatment of actinic keratosis and penis; erythematous denuded patches in the on his right hand with topical 5-fluorouracil (5-FU) antecubital fossae (Figure 2) and axillae; and crusty 8 years prior to presentation. Two months prior to erosions on the dorsum of his hands (Figure 3). presentation, electrodesiccation and curettage were His differential diagnosis included an intertrigi- performed on a squamous cell carcinoma in situ on nous toxic drug eruption versus bullous pemphigoid. the dorsum of his right hand. One month prior to pre- A punch biopsy of his right thigh revealed epidermal sentation, he initiated treatment of actinic keratoses ulceration with occasional necrotic keratinocytes and on the dorsal aspects of his right and left hands with vacuolar changes of the basal layer accompanied by 5-FU twice daily and tretinoin cream 0.1% once daily. a superficial perivascular lymphocytic infiltrate and Approximately 2 weeks after initiation of therapy, rare eosinophils. Direct immunofluorescence revealed the patient reported that he broke out with itchy, perivascular and subepithelial deposition of fibrinogen, painful, red spots and blisters on his hands, right and IgG, C3, and IgA, but the degree of positivity was not left medial thighs, genitalia, and bilateral antecubital as striking as would be expected in bullous pemphigoid. He was diagnosed with symmetrical drug-related intertriginous and flexural exanthema (SDRIFE), or Drs. Powers and Kovach are from West Virginia University School baboon syndrome, resulting from systemic absorp- of Medicine, Morgantown. Dr. Gordon is from the Center for Clinical tion of 5-FU. He was treated with triamcinolone Studies, Houston, Texas. Dr. Roberts is from private practice, acetonide ointment 0.1%, white petroleum jelly, Cumberland, Maryland. The authors report no conflict of interest. doxycycline hyclate, and gabapentin, in addition to Correspondence: Roxann Powers, MD, PO Box 9158, WVU Health prednisone. The rash gradually cleared over the next Science Center, Morgantown, WV 26506 ([email protected]). month but healed with scarring. WWW.CUTIS.COM VOLUME 89, MAY 2012 225 Copyright Cutis 2012. No part of this publication may be reproduced, stored, or transmitted without the prior written permission of the Publisher. SDRIFE Secondary to 5-FU A A CUTIS B B Figure 1. Violaceous and red erosions of the right (A) Figure 2. Erythematous denuded patches in the and left (B) medial thighs.Do Notright Copy(A) and left (B) antecubital fossae. Comment Cutaneous eruptions commonly occur secondary to systemic administration of drugs, topical adminis- tration of medications, and/or exposure to contact allergens. Although classic drug eruptions involve the trunk and extremities, unusual and specific distribu- tion patterns have been reported. The term baboon syndrome was introduced in 1984 to describe a specific dermatologic response to systemic or local administra- tion of contact allergens and certain drugs.1 The name was coined due to the characteristic distribution of erythema on the buttocks and upper inner thighs, resembling the red buttocks of baboons. The rash also characteristically occurred in flexural and intertrigi- nous areas such as the axillae and antecubital fossae. The earliest description of this curious distribution pattern occurred after exposure to mercury.2 Since the 1980s, more than 100 cases of baboon syndrome have been reported. Approximately half of the cases were attributed to exposure to systemic drugs, par- ticularly amoxicillin and/or -lactam antibiotics,3 but the syndrome also has been reported after expo- sure to valacyclovir hydrochloride,4 risperidone,5 Figure 3. Crusty erosions on the dorsum of the hands. 226 CUTIS® WWW.CUTIS.COM Copyright Cutis 2012. No part of this publication may be reproduced, stored, or transmitted without the prior written permission of the Publisher. SDRIFE Secondary to 5-FU cetuximab,6 ethylenediamine-aminophylline,7 pseu- Topical 5-FU, most commonly used for treatment doephedrine hydrochloride,8 and iodinated radio- of actinic keratosis, is frequently associated with a contrast media.9 Baboon syndrome typically presents moderate to severe irritant contact dermatitis with with sharply defined, V-shaped erythema in inguinal/ erythema, pruritus, irritation, burning, inflamma- genital and gluteal/perianal areas, sometimes with tion, vesiculation, and crusting at the site of applica- tiny papules, pustules, and vesicles, and often with tion.16 Allergic contact dermatitis from topical 5-FU exanthema in other flexural areas. Acral and muco- is thought to be uncommon but has been reported.17 sal sites usually are spared. Systemic symptoms are Tretinoin, a topical retinoid used to enhance absent.3 Histology is variable, with a reported pre- the uptake of 5-FU, can cause local irritation, ery- dominance of superficial perivascular infiltrates of thema, peeling, burning, and pruritus. If systemically mononuclear cells and occasional neutrophils and absorbed, it may be associated with xerosis and pal- eosinophils. Vacuolar alteration of the basal cell moplantar desquamation but has not been reported layer and the presence of necrotic keratinocytes to cause a flexural exanthema. have been mentioned in some cases.3 Our patient was careful to wash his hands after Hausermann et al3 proposed that the term baboon applying the medication and denied the possibility syndrome be replaced with SDRIFE to include the that he transferred the 5-FU or tretinoin to areas of occurrence of these reactions after exposure to sys- his body other than the dorsal surface of his hands. temic drugs. They proposed that certain criteria Cutaneous reactions distal to the area of topical be met for the diagnosis of SDRIFE: (1) exposure therapy with 5-FU have been rarely reported but to a systemically administered drug at the first could occur if there was increased systemic absorp- dose or repeated dose, excluding contact allergens; tion secondary to the breakdown of the skin barrier.18 (2) sharply demarcated erythema of the gluteal/ Pretreatment of the area with a topical retinoid and perianal area and/or V-shaped erythema of the inguinal/ electrodesiccation and curettage of his right hand perigenital area; (3) involvement of at least one other may have led to barrier reduction and greater absorp- intertriginous/flexural localization; (4) symmetry tion of 5-FU. Our patient’s distinctive skin eruption of affected areas; and (5) absence of systemic symp- was consistent with a diagnosis of SDRIFE secondary 3 CUTIS toms and signs. to systemic absorption of topical 5-FU. The precise immunologic and pathogenetic mechanisms of SDRIFE have yet to be elucidated. Conclusion Theorists propose that the inciting agent collects in Topical 5-FU is commonly used by dermatologists. eccrine or apocrine glands,Do areas of increasedNot tem- Local Copy irritant contact dermatitis is expected and is perature or friction,10 or areas of prior dermatitis (ie, considered to be a side effect of therapy. We present recall phenomenon,11 Wolf isotopic response12), and a case of a distant and distinctive eruption consistent elicits a T-cell–mediated, delayed-type hypersensi- with a diagnosis of baboon syndrome, or SDRIFE, tivity reaction.9 caused by topical application of 5-FU to raise aware- Webber et al10 reported the occurrence of an ness of the possibility of this adverse reaction. intertriginous eruption associated with chemother- apy in pediatric patients. Although not labeled REFERENCES as SDRIFE, the pattern and description of the 1. Andersen KE, Hjorth N, Menné T. ���������������The baboon syn- rash were consistent with SDRIFE. Methotrex- drome: systemically-induced allergic contact dermatitis. ate and cyclophosphamide
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