atypical carcinoid

atypical carcinoid

An intermediate form of neuroendocrine tumour between low-grade malignant (typical carcinoid) and high-grade small cell carcinoma.

Prognosis
Nodal metastases in 70% (vs. 5% for carcinoids); 5-year survival is 60%.

atypical carcinoid

An intermediate form of neuroendocrine tumor between low-grade malignant–typical carcinoid and high-grade small cell carcinoma. See Carcinoid, Small cell carcinoma.
References in periodicals archive ?
Neuroendocrine neoplasms of the larynx encompass five separate tumors: paraganglioma, typical carcinoid, atypical carcinoid, small cell carcinoma, and large cell neuroendocrine carcinoma.
5 cm; while an atypical carcinoid shows carcinoid morphology with number of mitoses greater than 2 and less than 10 per 10 HPFs and areas of coagulative necrosis.
The 2005 World Health Organisation classification of Head and Neck Tumors categorizes these neoplasms as typical carcinoid tumor, atypical carcinoid tumor, small cell carcinoma neuroendocrine type (SNEC) and neuroendocrine carcinoma "not otherwise specified".
We present the case of an atypical carcinoid tumor of lung origin metastasizing to a known pituitary adenoma.
An atypical carcinoid tumor secreting 5-hydroxytryptophan.
Head and neck large cell neuroendocrine carcinoma should be separated from atypical carcinoid on the basis of different clinical features, overall survival, and pathogenesis.
We describe what we believe is the first reported case of an atypical carcinoid tumor, or any other type of neuroendocrine carcinoma, of the uvula.
Survival analysis of 200 pulmonary neuroendocrine tumors with clarification of criteria for atypical carcinoid and its separation from typical carcinoid.
The 2004 World Health Organization (WHO) classification recognizes 4 major types of lung neuroendocrine tumors (NETs): typical carcinoid (TC), atypical carcinoid (AC), large cell neuroendocrine carcinoma (LCNEC), and small cell lung cancer (SCLC).
An intermediate category, atypical carcinoid (AC), is used to designate tumors with features between those of typical carcinoids (TC) and high-grade neuroendocrine carcinomas (SCLC and LCNEC).
While the term atypical carcinoid is not well defined for gastrointestinal NETs, the AJCC Cancer Staging Manual2 recommends using this term for appendiceal NETs with a mitotic count of 2 to 10 mitoses per 10 HPFs and/or focal necrosis.

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