Pigmented Epithelioid Melanocytomas and Their Mimics; Focus on Their Novel Molecular Findings

Pigmented epithelioid melanocytoma (PEM) is a unique tumor with significantly pigmented appearance and indolent behavior; however, it can demonstrate cytological atypia and metastasize to local lymph nodes. Clinical and histomorphological overlap between PEM and its lower or higher-grade mimics can make it difficult to distinguish in certain cases. Genomic, transcriptomic and epigenetic data indicate that PEMs are molecularly distinct entities from other melanocytic neoplasms and melanomas. In addition, methylation studies are emerging as a tool that can be useful in difficult cases. In this review, we focus on the clinical, histopathologic and recent insights in the molecular features of pigmented epithelioid melanocytic melanocytomas and their mimics. We also present a challenging case that was resolved using methylation analysis providing a proof of concept for using epigenetic studies for similar challenging cases.

COMPARISON OF ENDOMETRIAL INTRAEPITHELIAL NEOPLASIA & WHO CLASSIFIED ENDOMETRIAL HYPERPLASIA IN PREDICTING THE RISK OF PROGRESSION TO ENDOMETRIAL CARCINOMA

Background: Endometrial hyperplasia is the precursor lesion of most endometrial cancers of endometrioid type. The most commonly used classication system for endometrial hyperplasia is WHO 1994 classication system in which architecture disruption and cytological atypia are used to identify four types of endometrial hyperplasia including simple or complex hyperplasia with or without atypia. Newer EIN diagnosis by cytological atypia is of great consideration for the progression to endometrial cancer. Material And Methods: The study consists of 100 cases of WHO classied endometrial hyperplasia for period of 4 yrs from 2015 to 2019. Type of sampling procedures- dilation & curettage, endometrial biopsy and fractional curettage. Objective: 1. To discuss revised criteria for recognition of endometrial intraepithelial neoplasia (EIN). 2. To nd out the sensitivity of endometrial intraepithelial neoplasia (EIN) classication in predicting the risk of malignancy. Results: This study consists of 100 cases of endometrial hyperplasia. Patients were mostly postmenopausal & presented with abnormal vaginal bleeding. From WHO classied endometrial lesions, 2 out of 35 cases of simple typical hyperplasia, 10 out of 14 cases of complex typical hyperplasia,12 out of 20 cases of simple atypical hyperplasia and 20 out of 21 cases of complex atypical hyperplasia were reclassied as EI N. Conclusion: To estimate the risk of progression to carcinoma and guide clinical management, the histo-pathologic diagnosis of endometrial hyperplastic lesion is very important, specially the diagnosis of EIN lesions. EIN carries a much greater risk of progression to endometrial cancer than other WHO classied endometrial hyperplasia.

Intra-Scleral Blue Nevus Arising within Oculodermal Melanocytosis: Melanoma or Not?

We report a 61-year-old female who presented to our service with recent growth of a thickened, pigmented, sub-conjunctival lesion within an area of ocular melanocytosis in her left eye. Lamellar sclerectomy was performed. Histopathological assessment revealed a localized melanocytic proliferation with features of blue nevus arising within the area of ocular melanocytosis. There was a small zone of cells showing cytological atypia and expansion of the scleral stroma. We believe this case to be the first report of intrascleral blue nevus arising within an area of ocular melanocytosis. Given the cytological atypia, the blue nevus may perhaps represent an intermediate stage within a progression from ocular melanocytosis towards melanoma. Patients with oculodermal melanocytosis merit regular long-term surveillance for early detection of melanoma, not only in the uvea, but also in the orbit and potentially the ocular surface.

An Insight into the Utility of Sub-Categorisation of Atypia of Undetermined Significance for Risk Stratification: A Retrospective Study on an Indian Cohort with Histopathological Correlation

Background: Atypia of undetermined significance or follicular lesion of undetermined significance (AUS/FLUS) criterion in thyroid fine-needle aspirates (FNAs) has been a heterogeneous entity with much inter-observer variation. Sub-categorisation of AUS/FLUS has been observed to play an effective role in risk stratification. We aimed to validate AUS/FLUS sub-categorisation in correlation with the spectrum of malignancy. Study Design: Subjects included patients with AUS/FLUS diagnosed between January 2015 and December 2016. AUS/FLUS cases were sub-categorised into those exhibiting (1) architectural atypia, (2) cytological atypia, (3) architectural and cytological atypia, (4) AUS with Hürthle cells, and (5) AUS not otherwise specified (AUS-NOS). Each sub-category was correlated with their corresponding incidence of malignancy in surgical resections. Result: The overall incidence of AUS/FLUS in our centre was 13% (132/1,018). On retrospective review of 117 patients with AUS/FLUS, smears with cytological atypia showed a higher incidence of malignancy (78.3%) than those with architectural atypia (75.3%). AUS/FLUS cases with both cytological and architectural atypia had a malignancy rate of 71.4%. Conclusion: AUS/FLUS cases with cytological atypia had a higher risk of malignancy than those with architectural atypia. The sub-categorisation of AUS/FLUS is diagnostically important for the proper risk stratification of patients.