<unk>  are classified according to<unk> al grade: * Low grade<unk> : Typical<unk>  carcinoid<unk> r (TC; low-grade); * Intermediate-grade<unk> : Atypical<unk>  carcinoid<unk> r (AC; intermediate-grade) * High-grade<unk>  * Small cell lung cancer (SCLC) * Large cell neuroendocrine carcinoma (LCNEC of the lung) Low-grade nodular neuroendocrine proliferations ≥ 0.5 cm are classified as carcinoid<unk> s and smaller ones are called<unk><unk> lets. When neuroendocrine cell hyperplasia and<unk> lets are extensive, they represent the rare preinvasive lesion for carcinoids known as "diffuse idiopathic<unk>  neuroendocrine cell hyperplasia". Both LCNEC and SCLC can demonstrate histologic heterogeneity with other major histologic types of lung carcinoma, such as<unk>  adenocarcinoma or<unk>  squamous cell carcinoma, but is not characteristic of TC or AC.
Pulmonary neuroendocrine tumor
Atypical pulmonary carcinoid tumour
Large cell neuroendocrine carcinoma of the lung
Mucinous cystadenocarcinoma of the lung
Salivary gland–like carcinoma of the lung
Giant-cell carcinoma of the lung
Epithelial-myoepithelial carcinoma of the lung
Adenocarcinoma of the lung