Thyroid Cytopathology Reporting by the Bethesda System: A Two-Year Prospective Study in an Academic Institution

Table 2

Number of cases in various diagnostic categories and subcategories according to the Bethesda System for Reporting Thyroid Cytopathology (TBSRTC).

S. number	Cytological categories	Subcategories	Number of cases	Total number of cases in each category
		Cyst fluid only	16
1	Nondiagnostic/unsatisfactory (ND/UNS)	Virtually acellular specimen	0	16 (7.2)
		Other (obscuring blood, clotting artifact, etc.)	0
		Consistent with benign follicular nodule (includes adenomatoid nodule, colloid nodule, etc.)	138
2	Benign	Consistent with lymphocytic (Hashimoto) thyroiditis in the proper clinical context	36	180 (80)
		Consistent with granulomatous (subacute) thyroiditis	02
		Other	04
3	Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS)			11 (4.9)
4	Follicular neoplasm/suspicious for a follicular neoplasm (FN/SFN)			5 (2.2)
		Suspicious for papillary carcinoma	06
		Suspicious for medullary carcinoma	0
5	Suspicious for malignancy (SFM)	Suspicious for metastatic carcinoma	0	8 (3.6)
		Suspicious for lymphoma	01
		Other	01
		Papillary thyroid carcinoma	04
		Poorly differentiated carcinoma	0
		Medullary thyroid carcinoma	01
		Undifferentiated (anaplastic) carcinoma	0
6	Malignant	Squamous cell carcinoma	0	5 (2.2)
		Carcinoma with mixed features	0
		Metastatic carcinoma	0
		Non-Hodgkin lymphoma	0
		Other	0
	Total			225 (100)

(1) Figures in parentheses indicate percentages.
(2) “Other” subcategory in benign category consisted of cases of chronic nonspecific abscess.
(3) “Other” subcategory in suspicious for malignancy category consisted of a case of suspicious for malignancy, not otherwise specified.