Extensive mucinous metaplasia of the vulva arising within Zoon's vulvitis

Apocrine Papillary Hidrocystoma With Mucinous Metaplasia (Goblet Cell Type): A Case Report and Review of the Literature

ABSTRACT

Mucinous metaplasia (goblet cell type) is exceptionally rare in the skin. This is the second case of apocrine papillary hidrocystoma with mucinous metaplasia (goblet cell type) and a review of the literature exploring the significance and frequency of mucinous metaplasia with goblet cells in nongenital skin. The patient is an elderly man who presented with a blue-pigmented nodule on the scalp that was clinically suggestive of an atypical nevus. Histologically, the lesion was composed of a simple cyst of cuboidal cells with decapitation secretion and mucinous metaplasia with goblet cells. Papillary formation was identified in the cysts. Most cases of cutaneous mucinous metaplasia have been reported on genital skin, usually after chronic inflammation of the area. This type of mucinous metaplasia is categorized as benign mucinous metaplasia of the genitalia (BMM) and is believed to be unrelated to apocrine glands owing to the different histologic features and absence of apocrine differentiation by immunohistochemistry. Mucinous metaplasia (goblet cell type) has been previously reported in benign adnexal tumors (eccrine acrospiroma/hidroadenoma, mixed tumor, and syringocystadenoma papilliferum) and in malignant tumors (apocrine hidradenocarcinoma and squamous cell carcinoma). To date, mucinous metaplasia has not been identified in the histologically normal apocrine glands.

Plasma cell vulvitis: A systematic review

Background

Plasma cell vulvitis (PCV) is an inflammatory vulvar dermatosis that is not well characterized. Diagnosis is often delayed, and the condition can be refractory to treatment. To date, there are no systematic reviews on this topic.

Objective

This study aimed to provide a systematic review of PCV, including epidemiologic, clinical, and histopathologic findings, as well as associated comorbidities and treatment options.

Methods

A primary literature search was conducted using the PubMed, Ovid Medline, Cochrane, and CINAHL databases.

Results

Fifty-three publications with 196 patients (mean age: 55.3 ± 14.5 years) were included. The majority of studies were case reports and case series. Common symptoms included burning/stinging (52%), dyspareunia (44%), and pruritus (41%). Common findings included erythema (84%), glistening/shiny appearance (29%), well-demarcated lesions (25%), and erosions (22%). Common anatomic sites were the labia minora (45%), introitus (31%), and periurethral (19%). Fifty-three percent of patients had a solitary lesion. Common histologic findings were a predominant plasma cell infiltrate (88%), presence of other inflammatory cells (55%), hemosiderin/siderophages (46%), and epidermal atrophy (43%). Topical corticosteroids (64%) and tacrolimus ointment (13%) were the most frequent treatment modalities. In most reports, previous treatments were tried, and there was a diagnostic delay.

Conclusion

PCV is likely underrecognized and should be considered in patients with erythema of the mucous and modified mucous membranes, symptoms of burning or stinging, and a predominant plasma cell infiltrate on histopathology. First-line therapy should begin with high-potency topical corticosteroids, with the most evidence for clobetasol 0.05% or tacrolimus 0.1% ointment. Prospective studies are needed to further characterize this condition and to develop treatment guidelines.

Plasma Cell Vulvitis: A Systematic Review

OBJECTIVE

This systematic review aimed to present the available literature on plasma cell vulvitis (PCV), a relatively uncommon form of inflammatory vulvovaginal dermatitis.

MATERIALS AND METHODS

A literature search was performed in PubMed, Science Direct, and Google Scholar using the following key words: "plasma cell vulvitis," "Zoon vulvitis," and "vulvitis circumscripta plasmacellularis." Specific variables were assessed in each article, including patient age, menopausal status, comorbidities, presenting symptoms, symptom duration, histological description, treatment, and treatment response.

RESULTS

Thirty-nine articles met inclusion criteria, including 38 case reports and 1 observational study, with a total of 96 cases of PCV reported. The mean age of diagnosis was 52.9 years, with an age range of 8-76 years. Most common presenting symptoms included pruritis and vaginal discomfort, with average duration of symptoms 28.2 months (range = 2 months to 10 years). All reports demonstrated subepithelial plasma cell infiltrate on histology. Five percent of PCV cases reported concomitant autoimmune conditions and 6% sexually transmitted infections. Most common treatment modalities included topical corticosteroids (n = 41), tacrolimus (n = 6), and imiquimod (n = 6). In 53 reported outcomes, 88.7% of patients had resolution of symptoms with treatment.

CONCLUSIONS

Clinical research is needed to better determine the diagnostic criteria and to assess the efficacy of treatment options for PCV.

Plasma Cell Vulvitis: A Systematic Review of Interventions

OBJECTIVES

Plasma cell vulvitis (PCV) is a rare chronic inflammatory disorder, where the symptoms can be severe and may affect patient's quality of life. However, there are currently no evidence-based treatment guidelines. The aims of this systematic review were to evaluate efficacy of individual treatments and to inform future research.

MATERIALS AND METHODS

A systematic search was conducted of publication between 1952 and August 2020 via MEDLINE, Embase, and Emcare. All publications that evaluated the efficacy of treatments for patients with PCV were included. Forty-seven publications comprising 45 case reports and case series and 2 cohort studies were included.

RESULTS

To date, there are no randomized controlled trials evaluating the efficacy of different treatment options. There are also no studies that assess the impact of treatment on quality of life. Topical corticosteroids are the most frequently used first-line therapy, with limited evidence to support their efficacy, followed by topical imiquimod and surgical excision. The least supported intervention is cryotherapy.

CONCLUSIONS

Although descriptive studies support the use of topical corticosteroids and, to a lesser degree, topical calcineurin inhibitors and imiquimod, this review highlights the need for standardized outcome measures and randomized clinical trials for more definitive therapeutic recommendations for women with PCV.

Extramammary Paget disease of the vulva

Extramammary Paget disease (EMPD) is a rare neoplasm with uncertain histogenesis, usually presenting in the anogenital area, most commonly in the vulva. The disease is characterized by slow grow and high recurrence rates. This article reviews the epidemiological, clinical, morphological, genetic and treatment features of EMPD of the vulva reported in recent years.

Lichenoid dermatoses involving the vulva: A clinical-pathologic correlation✰

The lichenoid tissue reaction pattern generally signifies cytotoxic damage to the epithelium. When such reaction pattern occurs on vulvar skin or mucosa, the effects can result in considerable morbidity. None of the entities discussed in this review are entirely unique to the vulva, however, some entities may classically occur at this site, while others tend to be widespread diseases that may incidentally affect vulvar skin and mucosa. Given the complex anatomy of the vulva and the bridging of a site showing both keratinizing squamous epithelium and non-keratinizing squamous mucosa, histopathologic features may display variation in presentation. Although identification of a "lichenoid reaction pattern" alone may provide insight into the disease process, understanding of clinical presentation and specific sites of involvement, along with recognition of the nuanced features of the disease entities can help establish a specific diagnosis. Accurate histopathologic diagnoses by pathologists can improve the ability for treating clinicians to implement timely and effective treatment.

Vulval Intestinal/Enteric Heterotopia in a Patient with Crohn's Disease

Intestinal/enteric heterotopia of the vulva is an extremely rare disease with only 3 cases described in the literature. We report here an unusual case of this disease occurring in a 26-year-old patient in a context of Crohn's disease. To the best of our knowledge, such type of association has not been previously described. The potential origins of these lesions including metaplastic transformation, dysontogenetic changes, or epithelial colonic displacement/implantation are discussed.

Benign mucinous metaplasia of the genital mucosa: histomorphological and immunohistochemical features and criteria for differentiation from extramammary Paget disease

BACKGROUND

Benign mucinous metaplasia of the genitalia (BMM) is a rare condition typified by cells with foamy mucinous cytoplasm. Differential diagnoses include extramammary Paget disease (PD) and human papillomavirus (HPV)-induced vulval intraepithelial neoplasia (VIN) with mucinous differentiation.

OBJECTIVES

To characterize histopathological and immunohistochemical features of BMM and to forge criteria for differentiation from PD and VIN with mucinous differentiation.

METHODS

Eight biopsy specimens of BMM were stained with haematoxylin and eosin, periodic acid-Schiff and alcian blue, and for cytokeratin (CK) 7, CK10, CK14, CK20, carcinoembryonic antigen (CEA), epithelial membrane antigen (EMA), S100, gross cystic disease fluid protein-15 (GCDFP-15), lysozyme and Ki67 and compared with PD. Polymerase chain reaction was performed in order to identify HPV-specific DNA.

RESULTS

BMM showed mucin deposition in superficial epithelial layers ranging from numerous large goblet cells to subtle deposits. The epithelium often showed polygonal (squamoid) or cuboidal differentiation while columnar differentiation was an inconsistent feature. A band-like inflammatory infiltrate was consistently present. Metaplastic epithelium consistently expressed CK7, CEA and EMA either in the entire epithelium or in a superficial band, while CK14, CK10, GCDFP-15 and lysozyme were largely not expressed, and staining for CK20 and S100 was negative. Comparison with PD demonstrated similar staining characteristics, but in a scattered pattern of mucinous cells within preserved squamous epithelium and not in a band-like pattern as in BMM. Nuclear pleomorphism and Ki67-positive mucinous cells in superficial epithelial layers were seen only in PD; GCDFP-15 and/or lysozyme were expressed in the majority of cases of PD. No evidence of HPV-specific DNA was found in BMM.

CONCLUSIONS

The spectrum of changes in BMM is distinctive, and BMM can be differentiated with surety from both PD and VIN with mucinous differentiation.

Lesions of anogenital mammary-like glands: an update

Long considered to be ectopic breast tissue representing the caudal remnants of the milk ridges, anogenital mammary-like glands are nowadays thought to represent a normal constituent of the anogenital area. Lesions involving these glands, benign or malignant, epithelial or stromal manifest a striking similarity to their mammary counterparts. This review addresses the recent literature on lesions of anogenital mammary-like glands and our personal experience with various lesions related to these structures. Discussed are the normal anatomy and histology of these glands as well as the clinical presentation, histopathological and immunohistochemical features, molecular biological aspects, and differential diagnosis of various lesions involving anogenital mammary-like glands, including lactating adenoma, hidradenoma papilliferum, hidradenocarcinoma papilliferum, fibroadenomas, phyllodes tumor, pseudoangiomatous stromal hyperplasia, extramammary Paget disease, and other carcinomas. In addition, "nonspecific" epithelial or stromal changes some of which can be likened to similar changes occurring in a range of benign breast disease, including sclerosing adenosis, columnar cell lesions, ductal lesions and various metaplastic changes affecting epithelium and myoepithelium are discussed. Although lesions of anogenital mammary-like glands are often discussed in many dermatopathology textbooks in the context of cutaneous adnexal neoplasms we advocate that the best approach to the diagnosis of these lesions is to relate them to analogous well recognized lesions occurring in the breast, that is, through the eyes of a breast pathologist. This will enable their recognition, precise classification and should introduce greater uniformity in how they are reported in the literature so that more meaningful clinicopathological comparisons and correlations may be made.