Pigmented Epithelioid Melanocytoma (PEM)/Animal Type Melanoma (ATM): Quest for an Origin. Report of One Unusual Case Indicating Follicular Origin and Another Arising in an Intradermal Nevus
Pigmented epithelioid melanocytoma (PEM) is a tumor encompassing epithelioid blue nevus of Carney complex (EBN of CNC) and was previously termed animal-type melanoma. Histologically PEMs are heavily pigmented spindled and epithelioid dermal melanocytic tumors with infiltrative borders, however, thei...
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Published in | International journal of molecular sciences Vol. 18; no. 8; p. 1769 |
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Language | English |
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Abstract | Pigmented epithelioid melanocytoma (PEM) is a tumor encompassing epithelioid blue nevus of Carney complex (EBN of CNC) and was previously termed animal-type melanoma. Histologically PEMs are heavily pigmented spindled and epithelioid dermal melanocytic tumors with infiltrative borders, however, their origin remains unclear. Stem cells for the epidermis and hair follicle are located in the bulge area of the hair follicle with the potential to differentiate into multiple lineages. Multiple cutaneous carcinomas, including follicular cutaneous squamous cell carcinoma (FSCC), are thought to arise from stem cells in the follicular bulge. We present two cases of PEM/ATM in a 63 year-old male on the scalp with follicular origin and a 72 year-old female on the upper back arising in an intradermal nevus. Biopsy of both cases revealed a proliferation of heavily pigmented dermal nests of melanocytes with atypia. The Case 1 tumor was in continuation with the outer root sheath of the hair follicle in the bulge region. Case 2 arose in an intradermal melanocytic nevus. Rare mitotic figures, including atypical mitotic figures, were identified in both cases. We present two cases of PEM, with histologic evidence suggesting two origins: one from the follicular bulb and one from an intradermal nevus. |
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AbstractList | Pigmented epithelioid melanocytoma (PEM) is a tumor encompassing epithelioid blue nevus of Carney complex (EBN of CNC) and was previously termed animal-type melanoma. Histologically PEMs are heavily pigmented spindled and epithelioid dermal melanocytic tumors with infiltrative borders, however, their origin remains unclear. Stem cells for the epidermis and hair follicle are located in the bulge area of the hair follicle with the potential to differentiate into multiple lineages. Multiple cutaneous carcinomas, including follicular cutaneous squamous cell carcinoma (FSCC), are thought to arise from stem cells in the follicular bulge. We present two cases of PEM/ATM in a 63 year-old male on the scalp with follicular origin and a 72 year-old female on the upper back arising in an intradermal nevus. Biopsy of both cases revealed a proliferation of heavily pigmented dermal nests of melanocytes with atypia. The Case 1 tumor was in continuation with the outer root sheath of the hair follicle in the bulge region. Case 2 arose in an intradermal melanocytic nevus. Rare mitotic figures, including atypical mitotic figures, were identified in both cases. We present two cases of PEM, with histologic evidence suggesting two origins: one from the follicular bulb and one from an intradermal nevus. |
Author | Carlson, J Andrew Kaetzel, David Tarasen, Ashley Merlino, Glenn Leonard, M Kathryn Slominski, Andrzej T |
AuthorAffiliation | 1 Departments of Dermatology and Pathology, University of Alabama at Birmingham, Birmingham, AL 35201, USA; ashleytarasen@gmail.com 2 Department of Dermatopathology, Albany Medical College, Albany, NY 12201, USA; carlsoa@mail.amc.edu 3 Department of Biochemistry and Molecular Biology, Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA; KLeonard@som.umaryland.edu (M.K.L.); DKaetzel@som.umaryland.edu (D.K.) 5 Veterans Affairs Medical Center, Birmingham, AL 35201, USA 4 Center for Cancer Research, National Cancer Institute, Bethesda, MD 21201, USA; gmerlino@helix.nih.gov |
AuthorAffiliation_xml | – name: 2 Department of Dermatopathology, Albany Medical College, Albany, NY 12201, USA; carlsoa@mail.amc.edu – name: 3 Department of Biochemistry and Molecular Biology, Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA; KLeonard@som.umaryland.edu (M.K.L.); DKaetzel@som.umaryland.edu (D.K.) – name: 5 Veterans Affairs Medical Center, Birmingham, AL 35201, USA – name: 4 Center for Cancer Research, National Cancer Institute, Bethesda, MD 21201, USA; gmerlino@helix.nih.gov – name: 1 Departments of Dermatology and Pathology, University of Alabama at Birmingham, Birmingham, AL 35201, USA; ashleytarasen@gmail.com |
Author_xml | – sequence: 1 givenname: Ashley surname: Tarasen fullname: Tarasen, Ashley email: ashleytarasen@gmail.com organization: Departments of Dermatology and Pathology, University of Alabama at Birmingham, Birmingham, AL 35201, USA. ashleytarasen@gmail.com – sequence: 2 givenname: J Andrew surname: Carlson fullname: Carlson, J Andrew email: carlsoa@mail.amc.edu organization: Department of Dermatopathology, Albany Medical College, Albany, NY 12201, USA. carlsoa@mail.amc.edu – sequence: 3 givenname: M Kathryn surname: Leonard fullname: Leonard, M Kathryn email: KLeonard@som.umaryland.edu organization: Department of Biochemistry and Molecular Biology, Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA. KLeonard@som.umaryland.edu – sequence: 4 givenname: Glenn surname: Merlino fullname: Merlino, Glenn email: gmerlino@helix.nih.gov organization: Center for Cancer Research, National Cancer Institute, Bethesda, MD 21201, USA. gmerlino@helix.nih.gov – sequence: 5 givenname: David surname: Kaetzel fullname: Kaetzel, David email: DKaetzel@som.umaryland.edu organization: Department of Biochemistry and Molecular Biology, Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA. DKaetzel@som.umaryland.edu – sequence: 6 givenname: Andrzej T surname: Slominski fullname: Slominski, Andrzej T email: aslominski@uabmc.edu, aslominski@uabmc.edu organization: Veterans Affairs Medical Center, Birmingham, AL 35201, USA. aslominski@uabmc.edu |
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CitedBy_id | crossref_primary_10_1016_j_ad_2023_01_010 crossref_primary_10_1369_0022155420977970 crossref_primary_10_1016_j_ad_2023_01_001 crossref_primary_10_3390_cancers16122262 crossref_primary_10_3390_dermatopathology8030033 |
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Keywords | melanin pigment hair follicle melanoma hair follicle stem cell melanocytes |
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Notes | Abstract Presented during the Poster Session at the American Society of Dermatopathology (ASDP) 2015 Annual Meeting, October, 2015, San Francisco, CA 94101, USA. |
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SubjectTerms | Aged Animals Biopsy Carney complex Case Report Epidermis Hair hair follicle Hair Follicle - metabolism Hair Follicle - pathology hair follicle stem cell Hair loss Head and Neck Neoplasms - metabolism Head and Neck Neoplasms - pathology Humans Male melanin pigment Melanocytes Melanoma Melanoma - metabolism Melanoma - pathology Nevus Nevus, Intradermal - metabolism Nevus, Intradermal - pathology Scalp Scalp - metabolism Scalp - pathology Skin Skin Neoplasms - metabolism Skin Neoplasms - pathology Squamous cell carcinoma Stem cell transplantation Stem cells Tumors |
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Title | Pigmented Epithelioid Melanocytoma (PEM)/Animal Type Melanoma (ATM): Quest for an Origin. Report of One Unusual Case Indicating Follicular Origin and Another Arising in an Intradermal Nevus |
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