# A 72-year-old client presents to the clinic with a painful, vesicular rash on the left side of the chest that follows a dermatomal pattern. The client reports severe burning pain that began 2 days before the rash appeared. Which assessment finding would be most concerning and require immediate intervention?

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## 문제

A 72-year-old client presents to the clinic with a painful, vesicular rash on the left side of the chest that follows a dermatomal pattern. The client reports severe burning pain that began 2 days before the rash appeared. Which assessment finding would be most concerning and require immediate intervention?

## 보기

1. Presence of grouped vesicles on an erythematous base
2. Report of severe burning and stabbing pain along the affected dermatome
3. Vesicular lesions extending across the midline to the right side of the chest **✔ 정답**
4. Complaints of allodynia in the affected area

**정답: 3**

## 해설

Lesions crossing the midline indicate disseminated herpes zoster, a serious complication requiring immediate antiviral therapy. Other findings are typical of localized shingles.

## 심화 해설

Understanding the Clinical Scenario

A 72-year-old client presenting with a painful, vesicular rash in a dermatomal distribution on the chest is a classic presentation of herpes zoster (shingles). This condition results from the reactivation of the varicella-zoster virus (VZV), which remains latent in the dorsal root ganglia following a primary varicella (chickenpox) infection. The incidence and severity of herpes zoster increase with age due to immunosenescence, the age-related decline in immune function [2]. The prodromal burning pain the client describes is a typical neuropathic symptom caused by viral inflammation within the sensory ganglion.

Analyzing the Answer Choices

The question asks for the most concerning assessment finding requiring immediate intervention. To determine this, we must differentiate between expected manifestations of a typical zoster episode and findings that signal a potentially life-threatening or disseminated complication.

- Option 1: Presence of grouped vesicles on an erythematous base — This is the hallmark, expected dermatological presentation of herpes zoster. While it confirms the diagnosis and requires treatment, it does not represent an immediate, emergent threat.

- Option 2: Report of severe burning and stabbing pain along the affected dermatome — This describes acute neuritis, a painful but common and expected component of the zoster prodrome and active phase. It requires pain management but is not the most concerning finding.

- Option 3: Vesicular lesions extending across the midline to the right side of the chest — This is the most alarming finding. Herpes zoster is characteristically a unilateral disease because the reactivation occurs within a single dorsal root ganglion, which supplies a specific, one-sided dermatome. The appearance of lesions crossing the midline indicates disseminated cutaneous herpes zoster (DCHZ). Dissemination is defined by vesicular lesions appearing beyond the initially affected dermatome [3]. While DCHZ typically occurs in immunocompromised individuals, it can also develop in immunocompetent adults, making early recognition critical to prevent severe complications [1]. Dissemination signals viremia and carries a risk of visceral involvement, such as pneumonitis, hepatitis, or encephalitis, which can be fatal.

- Option 4: Complaints of allodynia in the affected area — Allodynia (pain from a non-painful stimulus, like light touch) is a common feature of neuropathic pain associated with herpes zoster and post-herpetic neuralgia. It is an expected symptom and not an immediate emergency.

Why Dissemination is the Priority

The correct answer is Option 3 because the spread of vesicular lesions beyond the primary dermatome and across the midline represents a transition from a localized infection to a systemic one. Disseminated zoster can lead to severe complications, including visceral involvement. For instance, the virus can affect internal organs, leading to conditions such as gastric ulceration, as seen in a case where dermatomal facial vesicles preceded gastrointestinal symptoms . Furthermore, dissemination can cause severe neurological sequelae, such as segmental zoster paresis or cranial neuropathies, including orbital apex syndrome when the trigeminal nerve is involved [2,3]. In an older adult with immunosenescence, the risk of progression from cutaneous dissemination to visceral or neurologic complications is significant and demands immediate escalation of care, often requiring intravenous antiviral therapy and a workup for underlying immunosuppression. The other options describe expected, albeit painful, features of a localized herpes zoster infection that are managed with oral antivirals and analgesics in an outpatient setting.References (research sources)

- [1]Disseminated Cutaneous Herpes Zoster in an Immunocompetent Patient: A Diagnostic Challenge.Research articleFrauwirth M, Scott R. (2026) · DOI: 10.7759/cureus.102786

- [2]Disseminated Herpes Zoster Virus: A Severe Case Complicated by Radicular Mononeuropathy in a Clinically Immunocompetent Individual.Research articleNeri Rosario D, Turcu I, Sapkota S, Rajendiran A, Ruck L, Sherwood J. (2025) · DOI: 10.7759/cureus.98834

- [3]Disseminated Herpes Zoster Leading to Orbital Apex Syndrome: A Case of MRI-Negative Cranial Neuropathy.Case reportDavis BM, Waite M, Taylor E, Meecham J, Gregory H. (2026) · DOI: 10.7759/cureus.101598

## 임상 시나리오

Recognizing Disseminated Herpes ZosterWhen shingles becomes a systemic emergency
A hallmark of uncomplicated herpes zoster is a unilateral, dermatomal rash that does not cross the midline. The most concerning assessment finding is the presence of vesicular lesions extending across the midline, which defines disseminated zoster.

Dissemination indicates viremia and is defined by more than 20 vesicles outside the primary and immediately adjacent dermatomes. This finding necessitates immediate intervention due to the risk of visceral involvement (lungs, liver, brain) and is more common in immunocompromised or older adults.

CautionDo not dismiss lesions that cross the midline as a normal variant. This sign requires urgent evaluation, systemic antiviral therapy, and often hospitalization to prevent life-threatening complications like pneumonitis or encephalitis.

## 핵심 개념

- **Herpes Zoster** — Reactivation of the varicella-zoster virus latent in dorsal root ganglia, presenting as a painful, unilateral, dermatomal vesicular rash.
- **Dermatomal Pattern** — A rash distribution that follows the sensory nerve pathway from a single spinal nerve root, typically not crossing the midline.
- **Disseminated Zoster** — A serious complication where vesicular lesions spread beyond the primary and adjacent dermatomes, potentially leading to visceral, pulmonary, and neurologic involvement.
- **Allodynia** — Pain caused by a stimulus that does not normally provoke pain, a common type of neuropathic pain seen with herpes zoster.
- **Prodrome** — Early symptoms preceding the characteristic rash, often including pain, burning, or tingling along the affected dermatome.

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