Advances in Fine Needle Aspiration Cytology for the Diagnosis of Pulmonary Carcinoma

Table 1

Factors contributing to difficulty of cytologic subtyping of adenocarcinoma and squamous cell carcinoma.

𝑁=165	Cellularity		Differentiation^(1)		Histologic type
	Low	High	Well-moderately	Poorly	ADC	SQC
Correct definitive Subtyping (𝑛=148)	82%	94%	87%	69%	93%	70%
Difficulty in Subtyping (𝑛=17)^(2)	18%	6%	13%	31%	7%	30%

⁽¹⁾Grade of differentiation was based on resected specimens.
⁽²⁾Difficulty in subtyping encompasses cases which were incorrectly classified, unclassified, or underclassified/subtype favored by cytology.