Large-cell neuroendocrine carcinomas (LCNECs) are relatively rare, and most reported occurrences tend to involve relatively large tumors. We report a small LCNEC in a 63-year-old male patient with pulmonary emphysema. The peripheral pulmonary nodule did not have lobulation and spiculation, and it was difficult to establish correct diagnosis before surgery because of its small size and effect of surrounding emphysematous change.
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Diagn Pathol
December 2024
Department of Pathology, Affiliated Jinhua Hospital, Zhejiang University School of Medicine, Jinhua, Zhejiang Province, 321000, China.
Background: Mixed adenoneuroendocrine carcinoma (MANEC) of the cervix is a rare malignant tumor with high malignancy and poor prognosis, of which large-cell neuroendocrine carcinoma and HPV-independent adenocarcinoma are particularly rare, which have been reported limitedly in the literature. Here, we present 2 cases of MANEC of the cervix and discuss important considerations for diagnosing cervical poorly differentiated carcinoma.
Case Presentation: we reported two cases of mixed large cell neuroendocrine carcinoma and adenocarcinoma of the cervix, one HPV-independent and one HPV-associated, both with vaginal bleeding.
Front Pharmacol
December 2024
Lung Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
Hum Pathol
December 2024
Henry Ford Health, Detroit, MI, USA; Michigan State University College of Human Medicine, East Lansing, MI, USA. Electronic address:
The morphologic diagnosis of colorectal carcinoma (CRC) is typically straight forward. However, there are certain subtypes of CRC that pose diagnostic challenges for daily practice due to sometimes overlapping morphologic and immunohistochemical features. These subtypes include poorly differentiated adenocarcinoma NOS, in the absence of conventional morphology (PDA-NOS), large cell neuroendocrine carcinoma (LCNEC), medullary carcinoma (MC), undifferentiated carcinoma (UC) and lymphoepithelioma-like carcinoma (LELC).
View Article and Find Full Text PDFNeuropathology
December 2024
Department of Pathology and Laboratory Medicine, UT Health-McGovern Medical School, Houston, Texas, USA.
Solitary fibrous tumors (SFTs) of the central nervous system (CNS) are rare mesenchymal tumors characterized by a fusion of the NGFI-A-binding protein 2 (NAB2) gene and the signal transducer and activator of transcription 6 (STAT6) gene, immunohistochemically resulting in nuclear expression of STAT6 - an immunohistochemical hallmark essential for diagnosis, as outlined in the fifth edition of the World Health Organization Classification of Tumors. Dedifferentiation, where low-grade tumors transform into high-grade forms, has been observed in SFTs, with documented cases involving sarcomatous or rarely epithelial transformations. We report the first case of a CNS SFT exhibiting "transdedifferentiation" into epithelioid neuroendocrine differentiation.
View Article and Find Full Text PDFVirchows Arch
December 2024
Department of Pathology, Gustave Roussy, 114 rue Edouard Vaillant, 94805, Villejuif cedex, France.
The double inactivation of TP53 and RB1 is considered typical of neuroendocrine carcinomas (NECs) but is assumed to be rare in high-grade neuroendocrine tumors (NETs). The immunohistochemical determination of the p53 and Rb status has therefore been proposed as a diagnostic tool. We studied this status in a large series of high-grade neuroendocrine neoplasms, from multiple origins, in order to (a) assess the patterns observed in the different histopathological categories, (b) compare them between the various anatomic sites, and (c) evaluate their possible diagnostic relevance.
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