Your pathology report says TaG1. G1,G2,G3 are a bit older classification, still in England it is the recommended grading system.
WHO changed in 2004 to papillary urothelial neoplasm of low malignant potential (PUNLMP), and LG and HG carcinoma. Your pathology is TaG1 and papillary type, which rise into lumen of the bladder. Ta means the tumor has not penetrated through the basement layer. G1 means either it was PUNLMP or LG. TaLG is stratified as low risk. Statistically, TaLG has recurrence ( rise of a tumor or tumors, at the same place or difference place of the bladder) about 30-60% in 5 years. But progression to HG or CIS is rare (5-15% depending on studies). CIS looks HG under microscope, but had not penetrated through the basement layer. Now a days, they can analyze entire DNA sequence of the tumor rather in expensive way. So, they have done DNA analysis for muscle invasive tumor and non muscle invasive tumors. The profile of gene mutations between muscle invasive and high grade/cis are similar. That is why we need aggressive treatment such as by BCG. But, the profile of gene mutations for LG is different from the profile of HG. The prominent differences are that LG tumor has the mutation in fiber growth factor receptor genes (FGFR) , and HG or muscle invasive has mutation in TP 53 gene which is considered as tumor suppressor gene. So, often LG and HG are mentioned as different cancer. So, it makes sense that TaLG or TaG1 are treated with TURBT only followed by regular cystoscopy. I agree bluelight helps the confidence level of cystoscopy, but I think they are used by large hospitals in the US and not much in England I guess. I understand your having anxiety especially they found something in cystoscope. I get anxious for annual cystoscopy too. But, odds are in favor for you to have LG again if it happens to be tumor. best luck
WHO grading
......G1...........G2............G3........
PUN........LG.........-HG.............
Lining of bladder
OOOOOOOOOOOOO Superficial layer
00000000000000000
00000000000000000 Intermediate layer Ta region
00000000000000000
oooooooooooooooo Basement (Basal) layer
Connective Tissue (Lamina Propria) T1 region
Muscle Tissue T2,T3 region
Fat