Clinicopathologic features and diagnostic challenges of small cluster pattern appendiceal neuroendocrine tumors.
Ann Diagn Pathol
; 69: 152250, 2024 Apr.
Article
en En
| MEDLINE
| ID: mdl-38142627
ABSTRACT
Appendiceal neuroendocrine neoplasms (NENs) can present with various growth patterns including the traditional triad of histologic patterns-insular, trabecular and tubular. A small cluster pattern was also found in this study and the literature on this specific morphology is limited. In this study, we conducted a comprehensive review of appendiceal NENs from our institution over a ten-year period. Clinical and demographic data were obtained from medical records. Immunohistochemical stains were performed with antibodies specific for synaptophysin, chromogranin, INSM1, CD56, serotonin and peptide YY. The small cluster pattern was found in 29.4 % of all cases evaluated. The tumor cells in these cases were predominantly located at the distal tip of the appendix, associated with fibrous obliteration. These tumors were smaller in size and tended towards less advanced tumor stage, with reduced incidence of lymphovascular and/or perineural invasion. Chromogranin expression was identified in 76 % of these cases. There is a heterogeneous hormone profile with 46.7 % serotonin and 33.3 % peptide YY. In conclusion, the small cluster pattern NENs present with unique histological features and hormone expression profile. Among the various neuroendocrine markers, INSM1 showed superior diagnostic performance, with high sensitivity and minimal non-specific staining.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Neoplasias Pancreáticas
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Neoplasias del Apéndice
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Neoplasias Gástricas
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Tumores Neuroendocrinos
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Carcinoma Neuroendocrino
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Neoplasias Intestinales
Límite:
Humans
Idioma:
En
Revista:
Ann Diagn Pathol
Asunto de la revista:
PATOLOGIA
Año:
2024
Tipo del documento:
Article