• Adenocarcinoma is the most common lung cancer which usually arises from peripheral small bronchi and is often associated with a scar. The tumor cells form glands and secrete mucin. Mucus stains bright pink with mucicarmine stain and PAS after diastase
  • Bronchioloalveolar carcinoma (BAC) classically spreads in a single layer on top of alveolar septa that serve as scaffolding for the malignant cell growth. In half the tumors the cells are tall, well-differentiated, mucin-producing with basally located nuclei. Nonmucinous BAC is composed of tall columnar cells or cuboidal cells growing along the alveolar walls

• SCC, most strongly associated with smoking, can be well, moderately or poorly differentiated. The tumor cells are large, with pink cytoplasm and keratinization, forming keratin pearls. In the poorly differentiated carcinomas, the cells are highly atypical with rare individual cell keratinization

• Small cell carcinoma, regardless of histologic subtype, lacks a defined architectural pattern. It is composed of sheets of haphazardly arranged small cells with scantly cytoplasm. At low power, the tumor appears blue due to the closely opposed nuclei. There are numerous mitotic figures and foci of necrosis are present

Gross
Mass near hilum
Lymph nodes
Squamous cell ca
Adeno Ca infiltrating around cartilage
Broncho-alveolar ca gross
Broncho-alveolar ca
Broncho-alveolar ca gross
Broncho-alveolar ca gross
Broncho-alveolar ca
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SCC
SCC
SCC