Table 1.

Thyroid nodule prevalence according to their size, malignancy, and number of patients affected

Thyroid nodule size	Histology			Patients (n)	Patients with cancer (n)
	Malignant	Benign	All
All nodulesa	612	2037	2649	1059	358
Known size	548	1616	2164	977b	337b
Microscopic	149c	17	166	133	54c
Unknown size	64	421	485	62d	21d

^aIn 33 patients with cancer, the largest malignant focus was in a lymph node. These foci are not included. 

^bNumber of patients with at least one nodule or one malignant nodule of known size. 

^cOne hundred twenty patients had one or more microscopic foci of cancer. In 46 of these patients, only microscopic foci were present; in another eight patients, the largest focus of cancer was in a lymph node, and only microscopic foci were in the thyroid. 

^dSixty-two patients with all of their nodules of unknown size and 21 patients with all of their malignant nodules of unknown size.