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Kieselova K, Santiago F, Amado C, Henrique M. Case for diagnosis. Solitary violaceous nodule on the toe. An Bras Dermatol 2018; 93:595-597. [PMID: 30066776 PMCID: PMC6063114 DOI: 10.1590/abd1806-4841.20187445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 12/15/2017] [Indexed: 08/17/2023] Open
Abstract
Reticulohistiocytomas represent a group of benign histiocytic dermal proliferations, which occur either sporadically as solitary cutaneous nodules or, when multiple, in association with systemic disease. Due to its nonspecific clinical presentation, reticulohistiocytoma may mimic other benign or malignant skin neoplasms; therefore, in most cases, a biopsy is needed in order to establish the correct diagnosis. The histology is typically characterized by the presence of large histiocytes with abundant eosinophilic cytoplasm with immunohistochemical profile positive for CD68, CD163, and vimentin. The authors report the case of a patient with solitary reticulohistiocytoma with illustrative clinical, dermoscopic, and histologic features.
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Affiliation(s)
- Katarina Kieselova
- Department of Dermatology, Centro Hospitalar de Leiria, Leiria,
Portugal
| | | | - Cristina Amado
- Department of Pathology, Centro Hospitalar de Leiria, Leiria,
Portugal
| | - Martinha Henrique
- Department of Dermatology, Centro Hospitalar de Leiria, Leiria,
Portugal
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Wang GY, Nazarian RM, Zhao L, Hristov AC, Patel RM, Fullen DR, Chan MP. Protein gene product 9.5 (PGP9.5) expression in benign cutaneous mesenchymal, histiocytic, and melanocytic lesions: comparison with cellular neurothekeoma. Pathology 2016; 49:44-49. [PMID: 27914685 DOI: 10.1016/j.pathol.2016.09.061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Revised: 09/07/2016] [Accepted: 09/09/2016] [Indexed: 10/20/2022]
Abstract
Cellular neurothekeoma (CNTK) frequently enters the differential diagnosis of a benign dermal cellular proliferation. Diagnosis often relies on immunohistochemistry including the use of protein gene product 9.5 (PGP9.5). A previous study demonstrated PGP9.5 expression across a wide variety of soft tissue neoplasms. We explored the utility of this antibody in distinguishing CNTK from other benign dermal-based lesions. A cohort of CNTK (n=7) and benign cutaneous lesions of neural (n=28), fibrohistiocytic (n=23), fibroblastic (n=25), histiocytic (n=18), myofibroblastic (n=7), smooth muscle (n=14), and melanocytic (n=12) differentiations were immunostained with PGP9.5. Staining was graded by H-score and compared with CNTK. A significantly higher H-score was found in CNTK compared with the fibrohistiocytic (p=0.0001), histiocytic (p=0.0016), myofibroblastic (p=0.0003), smooth muscle (p<0.0001), and melanocytic (p=0.0004) groups, with the exceptions of plexiform fibrohistiocytic tumour, xanthoma, and xanthogranuloma. No significant difference was found when comparing CNTK with fibroblastic and neural lesions, with the exceptions of neurofibroma and perineurioma. In conclusion, PGP9.5 is helpful in distinguishing CNTK from most benign cutaneous fibrohistiocytic, histiocytic, myofibroblastic, smooth muscle, and melanocytic lesions. In addition to CNTK and neural lesions, PGP9.5 is also expressed in benign fibroblastic lesions, and therefore distinction of these lesions should not be based on PGP9.5 positivity.
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Affiliation(s)
- Grace Y Wang
- Department of Pathology, University of Michigan, Ann Arbor, MI, United States
| | - Rosalynn M Nazarian
- Pathology Service, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Lili Zhao
- Department of Biostatistics, University of Michigan, Ann Arbor, MI, United States
| | - Alexandra C Hristov
- Department of Pathology, University of Michigan, Ann Arbor, MI, United States; Department of Dermatology, University of Michigan, Ann Arbor, MI, United States
| | - Rajiv M Patel
- Department of Pathology, University of Michigan, Ann Arbor, MI, United States; Department of Dermatology, University of Michigan, Ann Arbor, MI, United States
| | - Douglas R Fullen
- Department of Pathology, University of Michigan, Ann Arbor, MI, United States; Department of Dermatology, University of Michigan, Ann Arbor, MI, United States
| | - May P Chan
- Department of Pathology, University of Michigan, Ann Arbor, MI, United States; Department of Dermatology, University of Michigan, Ann Arbor, MI, United States.
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