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Barbosa JD, Oliveira MC, Oliveira CMC, Bomjardim HDA, Ferreira TTA, Duarte MD, da Silveira JAS, Silveira NDSES, Barbosa CC, da Silva AOA, Armién A, Brito MDF. Extracutaneous Melanotic Melanoma with Nervous System Involvement in a Buffalo ( Bubalus bubalis). Vet Sci 2023; 10:662. [PMID: 38133213 PMCID: PMC10747635 DOI: 10.3390/vetsci10120662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/04/2023] [Accepted: 10/12/2023] [Indexed: 12/23/2023] Open
Abstract
Melanomas are tumors arising from externally uncontrolled melanocytes that produce varying amounts of melanin. In this study, we report a case of melanoma with neurological impairment without evidence of cutaneous neoplastic lesions in an adult buffalo in the state of Pará, Brazil. Clinically, the buffalo exhibited apathy, decreased mandibular tone, and occasionally an open mouth with motor incoordination, and eventually succumbed to the condition. Necropsy revealed multifocal tumor masses in the brain, pituitary gland, trigeminal ganglion, and spinal cord. The neoplastic cells showed strong positive signals for vimentin, Melan-A, PNL-2, and SOX10. The diagnosis was made via necropsy, histopathology, and positive immunostaining for Melan-A and PNL-2, which are specific markers for melanocyte identification.
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Affiliation(s)
- José Diomedes Barbosa
- Instituto de Medicina Veterinária, Universidade Federal do Pará (UFPA), Castanhal 68740-970, PA, Brazil; (C.M.C.O.); (T.T.A.F.); (M.D.D.); (J.A.S.d.S.); (N.d.S.e.S.S.); (C.C.B.); (A.O.A.d.S.)
| | - Mariana Correia Oliveira
- Departamento de Epidemiologia e Saúde Pública (DESP), Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica 23890-000, RJ, Brazil; (M.C.O.); (M.d.F.B.)
| | - Carlos Magno Chaves Oliveira
- Instituto de Medicina Veterinária, Universidade Federal do Pará (UFPA), Castanhal 68740-970, PA, Brazil; (C.M.C.O.); (T.T.A.F.); (M.D.D.); (J.A.S.d.S.); (N.d.S.e.S.S.); (C.C.B.); (A.O.A.d.S.)
| | - Henrique dos Anjos Bomjardim
- Instituto de Estudos do Trópico Úmido (IETU), Universidade Federal do Sul e Sudeste do Pará (UNIFESSPA), Xinguara 68557-335, PA, Brazil;
| | - Tatiane Teles Albernaz Ferreira
- Instituto de Medicina Veterinária, Universidade Federal do Pará (UFPA), Castanhal 68740-970, PA, Brazil; (C.M.C.O.); (T.T.A.F.); (M.D.D.); (J.A.S.d.S.); (N.d.S.e.S.S.); (C.C.B.); (A.O.A.d.S.)
| | - Marcos Dutra Duarte
- Instituto de Medicina Veterinária, Universidade Federal do Pará (UFPA), Castanhal 68740-970, PA, Brazil; (C.M.C.O.); (T.T.A.F.); (M.D.D.); (J.A.S.d.S.); (N.d.S.e.S.S.); (C.C.B.); (A.O.A.d.S.)
| | - José Alcides Sarmento da Silveira
- Instituto de Medicina Veterinária, Universidade Federal do Pará (UFPA), Castanhal 68740-970, PA, Brazil; (C.M.C.O.); (T.T.A.F.); (M.D.D.); (J.A.S.d.S.); (N.d.S.e.S.S.); (C.C.B.); (A.O.A.d.S.)
| | - Natália da Silva e Silva Silveira
- Instituto de Medicina Veterinária, Universidade Federal do Pará (UFPA), Castanhal 68740-970, PA, Brazil; (C.M.C.O.); (T.T.A.F.); (M.D.D.); (J.A.S.d.S.); (N.d.S.e.S.S.); (C.C.B.); (A.O.A.d.S.)
| | - Camila Cordeiro Barbosa
- Instituto de Medicina Veterinária, Universidade Federal do Pará (UFPA), Castanhal 68740-970, PA, Brazil; (C.M.C.O.); (T.T.A.F.); (M.D.D.); (J.A.S.d.S.); (N.d.S.e.S.S.); (C.C.B.); (A.O.A.d.S.)
| | - Aluízio Otávio Almeida da Silva
- Instituto de Medicina Veterinária, Universidade Federal do Pará (UFPA), Castanhal 68740-970, PA, Brazil; (C.M.C.O.); (T.T.A.F.); (M.D.D.); (J.A.S.d.S.); (N.d.S.e.S.S.); (C.C.B.); (A.O.A.d.S.)
| | - Anibal Armién
- California Animal Health & Food Safety Laboratory System, University of California, Davis, CA 95616, USA;
| | - Marilene de Farias Brito
- Departamento de Epidemiologia e Saúde Pública (DESP), Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica 23890-000, RJ, Brazil; (M.C.O.); (M.d.F.B.)
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Neuroendocrine Transdifferentiation in Cutaneous Melanoma: A Case Report and Review of the Literature. Am J Dermatopathol 2023; 45:264-268. [PMID: 36921302 DOI: 10.1097/dad.0000000000002377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Accepted: 12/01/2022] [Indexed: 03/17/2023]
Abstract
ABSTRACT Neuroendocrine transdifferentiation refers to the progressive transformation of a nonneuroendocrine tumor to the one showing evidence of neuroendocrine differentiation on morphological and immunohistochemical grounds. Although this phenomenon has been well-documented in certain malignancies, particularly prostatic adenocarcinoma after androgen deprivation, cases of neuroendocrine transdifferentiation in melanomas are exceptionally rare. Herein, we report a case of a conventional superficial spreading melanoma occurring on the skin of the leg in a young male which showed progressive neuroendocrine transdifferentiation as it progressed through 2 in-transit metastases and a nodal metastatic deposit over a 4-year period. The tumor retained the BRAF V600E mutation throughout the disease process, and disease control was achieved through dual BRAF inhibition therapy. The possibility of melanoma masquerading as a high-grade neuroendocrine malignancy when investigating tumors of unknown primary should be kept in the mind of clinicians and histopathologist alike as a potential diagnostic pitfall, thus helping avoid misdiagnosis and guide appropriate treatment strategies.
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