Melanocyte colonization associated with malignant transformation of eccrine poroma

Pigmented Microcystic Adnexal Carcinoma with Melanocyte Colonization: A Case Report

Abstract is missing (Short communication)

Eccrine Porocarcinoma: A Multicenter Retrospective Study with Review of the Literatures Reported in Korea

BACKGROUND

Eccrine porocarcinoma (EPC) is a rare malignant cutaneous adnexal tumor. Other than several scattered case reports, no comprehensive review on EPC has been conducted in Korea.

OBJECTIVE

To clinicopathologically review all EPC cases from our institutions as well as those reported in Korea.

METHODS

Medical records and histopathological slides of EPC cases in the skin biopsy registries of our institutions were retrospectively reviewed. Additionally, EPC cases reported in Korea before June 2019 were retrieved by searching the PubMed, KoMCI, KoreaMed, and KMbase databases.

RESULTS

Nine EPC cases from our institutions were included in the study. In addition, 27 reports of 28 patients with EPC were reported in Korea. A total of 37 patients with EPC were identified, consisting of 19 males (male:female ratio, 1.06:1; mean age at diagnosis, 65.6 years). The most common site of primary tumor was the head and neck (29.7%). Wide excision was the most common (78.4%) treatment method. Initial metastasis work-up imaging studies were performed in 18 patients (48.6%), and metastasis was confirmed in eight patients (21.6%).

CONCLUSION

EPC is a rare cutaneous carcinoma in Korea. EPC usually affects elderly patients, with no sexual predilection. Due to possible metastasis, careful diagnosis and appropriate metastasis work-ups are warranted in EPC.

Eccrine porocarcinoma of the head and neck: Meta-analysis of 120 cases

BACKGROUND

The aim of the study is to analyze potential prognostic factors and to evaluate therapy strategies regarding clinical outcome in patients with eccrine porocarcinoma (EPC) of the head and neck.

METHODS

One hundred and sixteen EPC cases from ninety studies and four authors' EPC cases were included in the meta-analysis.

RESULTS

At an average follow up of 20.48 months, the 3-year overall survival and regional recurrence rate were 70.3% and 19.0%, respectively. Patients without surgical treatment had a significantly worse 3-year overall survival. Mohs microscopic surgery led to significantly less occurrence of regional recurrences compared to wide excision. An ulcerating lesion, high mitotic activity, and lymphovascular invasion were significant prognostic factors.

CONCLUSION

Surgical resection is the cornerstone in the therapy of EPC and represents the therapeutic modality that offers the best chance of disease-free survival. Due to the high probability of recurrence, close follow-ups are strongly recommended.

Melanocytic colonization of a meningothelial meningioma: histopathological and ultrastructural findings with immunohistochemical and genetic correlation: case report

OBJECTIVE AND IMPORTANCE

Melanocytic colonization of nonpigmented extracranial tumors has been reported in adenocarcinomas, squamous cell carcinomas, skin appendage tumors, and dermatofibrosarcoma protuberans. To our knowledge, melanocytic colonization of a meningioma has not previously been described.

CLINICAL PRESENTATION

We report an unusual case of a 70-year-old African-American woman who presented with a large frontoparietal meningioma that extended through the calvarium.

INTERVENTION

Craniotomy with gross total resection of the tumor was performed. Histochemistry, immunocytochemistry, ultrastructural analysis, and molecular genetic study via fluorescence in situ hybridization confirmed melanocytic colonization of a meningothelial meningioma.

CONCLUSION

With the inclusion of meningothelial meningioma, the spectrum of tumors affected by melanocytic colonization continues to expand.

In vivo confocal imaging of pigmented eccrine poroma

BACKGROUND

Near-infrared reflectance confocal microscopy (CM) imaging is a noninvasive technique that can be utilized to evaluate histologic features of cutaneous lesions in vivo.

OBJECTIVE

A case of pigmented eccrine poroma was examined with CM.

METHODS

Confocal images were taken to define the features of the lesion and correlated with transverse hematoxylin-eosin (HE)-stained sections.

RESULTS

In CM imaging, a well-demarcated homogeneous nest consisting of small uniform cells was seen. The nest contained nonrefractile dark spaces that may represent cuticuli. Many dendritic melanocytes containing melanin were intermingled with the tumor cells, and numerous melanophages were present in the upper dermis. A marked prominence of surrounding vessels was also demonstrated.

CONCLUSIONS

CM could well demonstrate the features of a pigmented eccrine poroma, as correlated with transverse HE-stained sections. However, high reflectance signals from melanin had to be carefully considered before a definitive diagnosis could be made.