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Am Fam Physician. 2011;84(9):1035-1036

Author disclosure: No relevant financial affiliations to disclose.

A 51-year-old man developed a mild fever and several serous vesicles on an erythematous base on his trunk (Figures 1 and 2) three months after having a renal transplant. During the following 10 days, similar lesions developed on his neck, upper arms, lower back, and inner thigh. The patient had the transplant because of end-stage renal disease related to interstitial nephritis. He had received a kidney from his father and was on immunosuppressive therapy.

Physical examination was otherwise normal, with no evidence of secondary infection. Complete blood count, liver enzyme level, and serum creatinine level were normal. A Tzanck test from a vesicle showed giant cells and acantholytic cells.

Question

Based on the patient's history, physical examination, and laboratory results, which one of the following is the most likely diagnosis?

Discussion

The answer is E: varicella-zoster virus infection. Patients with a primary infection typically present with fever, constitutional symptoms, and a vesicular, pruritic, widely disseminated rash that primarily involves the trunk and face.1 In patients who have had an organ transplant, symptoms usually resolve without complication. In rare cases, however, primary varicella leads to more severe disease and visceral invasion.1

Complications of varicella can be life threatening and include hepatitis, pancreatitis, pneumonitis, and encephalitis.1 Definitive laboratory testing, including polymerase chain reaction assays, direct fluorescent antibody testing on skin scrapings, viral culture, and serology, can be used for atypical cases of varicella and should be used routinely for suspected disseminated or visceral disease.1,2 Test results positive for immunoglobulin G and immunoglobulin M indicate a recent infection with varicella-zoster virus. Patients who develop primary varicella, or disseminated or organ-invasive disease following a transplant should be treated with intravenous acyclovir (Zovirax).13

The cutaneous manifestations of cytomegalovirus infection in organ transplant recipients are nonspecific. Cutaneous lesions may include ulcers, morbilliform rash, petechiae, purpuric eruptions, necrotic papules, and vesiculobullous eruptions.2

Epstein-Barr virus infection can cause a diffuse maculopapular and morbilliform rash. The lesions are vesicular, erythematous, and purpuric and may be accompanied by fever, pharyngitis, and lymphadenopathy.2

Organ transplant recipients with herpes simplex virus infection typically present with mucocutaneous lesions of the oropharynx. The herpetic vesicles break down to form shallow, grouped erosions and ulcers. In patients with immunosuppression, these ulcers may become large, confluent, chronic, granulating, and slow healing.1,2

Herpes zoster appears as a painful vesicular rash in a dermatomal distribution. Patients with herpes zoster who are immunocompromised may develop disseminated skin lesions that can mimic primary varicella during periods of prominent immunosuppression. All patients with previous varicella infection or vaccination are at risk of herpes zoster.2

ConditionCharacteristics in organ transplant recipients
CytomegalovirusNonspecific cutaneous lesions; may include ulcers, morbilliform rash, petechiae, purpuric eruptions, necrotic papules, and vesiculobullous eruptions
Epstein-Barr virusDiffuse maculopapular, morbilliform rash with vesicular, erythematous, purpuric lesions; may be accompanied by fever, pharyngitis, and lymphadenopathy
Herpes simplex virusMucocutaneous lesions of the oropharynx; vesicles form into shallow, grouped erosions and ulcers; patients with immunosuppression may have large confluent, chronic, granulating, slow-healing ulcers
Herpes zosterPainful vesicular rash in a dermatomal distribution; patients with immunosuppression may have disseminated skin lesions mimicking varicella
Varicella-zoster virusTypically a vesicular, pruritic, widely disseminated rash that usually involves the trunk and face and is accompanied by fever and constitutional symptoms; rarely, primary varicella leads to more severe disease and visceral invasion

The editors of AFP welcome submissions for Photo Quiz. Guidelines for preparing and submitting a Photo Quiz manuscript can be found in the Authors' Guide at https://www.aafp.org/afp/photoquizinfo. To be considered for publication, submissions must meet these guidelines. E-mail submissions to afpphoto@aafp.org.

This series is coordinated by John E. Delzell Jr., MD, MSPH, associate medical editor.

A collection of Photo Quiz published in AFP is available at https://www.aafp.org/afp/photoquiz

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