[Retracted] Multi-Slice Spiral Computed Tomography Image Features under Hybrid Iterative Reconstruction Algorithm in Staging Diagnosis of Bladder Cancer

Table 2

Pathological staging of bladder cancer using the 7th edition of TNM staging method, 2009.

T (primary tumor)	Tx		The primary tumor could not be evaluated.
	To		No evidence of primary tumor.
	Ta		Non-invasive papillary carcinoma.
	Tis		Carcinoma in situ (“squamous carcinoma”).
	T1		Tumor invasion of subepithelial connective tissue.
	T2 (muscular layer invasion)	T2a	Tumor invasion of superficial muscularis (medial half).
		T2b	Tumor invasion of the deep muscle layer (lateral half).
	T3 (surrounding tissue invasion)	T3a	The tumor invaded the tissues around the bladder under the microscope.
		T3b	The tumor can be seen to invade the tissues around the bladder (extra-bladder mass).
	T4 (other organ or tissue invasion)	T4a	The tumor invaded the prostate, uterus, or vagina.
		T4b	Tumor invaded the pelvic or abdominal wall.
N (regional lymph nodes)	Nx		Regional lymph nodes could not be evaluated.
	No		No regional lymph node metastasis.
	N1		Single lymph node metastasis from the true pelvic region (internal iliac, obturator, external iliac, or anterior sacral).
	N2		Multiple lymph nodes in the true pelvis (internal iliac, obturator foramen, external iliac, or anterior sacral).
	N3		Common iliac lymph node metastasis.
M (distant metastasis)	Mx		Distant metastases could not be assessed.
	M0		No distant metastasis.
	M1		There were distant metastases.