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Lung Cancer.pdf

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Pathologic Evaluation of <strong>Lung</strong> <strong>Cancer</strong> 63<br />

Table 4–1. World Health Organization Classification<br />

of Epithelial Tumors of the <strong>Lung</strong><br />

Benign Tumors<br />

Papilloma<br />

Squamous cell papilloma<br />

Exophytic<br />

Inverted<br />

Glandular papilloma<br />

Mixed squamous cell and glandular papilloma<br />

Adenoma<br />

Alveolar adenoma<br />

Papillary adenoma<br />

Adenoma of salivary-gland type<br />

Mucous gland adenoma<br />

Pleomorphic adenoma<br />

Mucinous cystadenoma<br />

Preinvasive Lesions<br />

Squamous dysplasia and carcinoma in situ<br />

Atypical adenomatous hyperplasia<br />

Diffuse idiopathic pulmonary neuroendocrine cell hyperplasia<br />

Malignant Tumors<br />

Squamous cell carcinoma<br />

Papillary squamous cell carcinoma<br />

Clear cell squamous cell carcinoma<br />

Small cell squamous cell carcinoma<br />

Basaloid squamous cell carcinoma<br />

Small cell carcinoma<br />

Small cell carcinoma<br />

Combined small cell carcinoma<br />

Adenocarcinoma<br />

Acinar adenocarcinoma<br />

Papillary adenocarcinoma<br />

Bronchioloalveolar adenocarcinoma<br />

Nonmucinous<br />

Mucinous<br />

Mixed mucinous and nonmucinous or indeterminate cell type<br />

Solid adenocarcinoma with mucin<br />

Adenocarcinoma with mixed subtypes<br />

Well-differentiated fetal adenocarcinoma<br />

Mucinous (colloid) adenocarcinoma<br />

Mucinous cystadenocarcinoma<br />

Signet-ring adenocarcinoma<br />

Clear cell adenocarcinoma (continued)

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