The grade of neuroendocrine carcinoma (NEC) that is associated with hemoptysis, pneumonia, and tumor cells arranged in cords and clusters is:a. Grade VI NEC
Grade I neuroendocrine carcinoma (NEC) (classic or typical carcinoid) is a low-grade NEC; 80% arise in the epithelium of the central airways. It occurs primarily in younger patients. Because of the central location, it classically presents with hemoptysis, with or without airway obstruction and pneumonia. Histologically, tumor cells are arranged in cords and clusters with a rich vascular stroma. This vascularity can lead to life-threatening hemorrhage with even simple bronchoscopic biopsy maneuvers. Regional lymph node metastases are seen in 15% of patients, but rarely spread systemically or cause death.