['To determine whether intratrigonal Onabotulinum toxin A (OnabotA) injection produces a different symptomatic outcome and duration of effect on ulcerative (Ulc) and nonulcerative (NUlc) bladder pain syndrome/interstitial cystitis (BPS/IC) patients and to compare the urinary levels of neurotrophines (NGF, BDNF, and GDNF) in response to OnabotA.', "Ten Ulc and 14 NUlc bladder pain syndrome/interstitial cystitis patients were included in this study. OnabotA (100 U) was injected in 10 trigonal sites, each receiving 10 U in 1 mL of saline. Outcome measures included pain visual analog scale (0-10), a 3-day voiding chart, O'Leary-Sant Score (OSS), and quality of life (QoL) from International Prostate Symptoms Score assessed before treatment, 1 month after injection, and every 3 months afterwards. Urinary NGF, BDNF, and GDNF were accessed using ELISA, at same time points. Treatment duration was determined at the time patients requested another injection.", 'Patients had a mean age of 40 ± 12 years in the Ulc and 47 ± 13 years in the NUlc group (ns). Mean values at baseline of pain intensity, frequency, nocturia, OSS, QoL, and urinary NGF, BDNF, GDNF were identical in the 2 groups. Patients with the Ulc phenotype had a longer duration of symptoms (28.8 ± 11 vs 19.2 ± 8 months, P = .018). Both groups responded equally to OnabotA, with significant improvements in pain intensity, frequency, nocturia, OSS, QoL, and urinary NGF, BDNF, GDNF. The effect lasted for 9 ± 2.8 (Ulc) and 10.5 ± 2 (NUlc) months.'] Do ulcerative and nonulcerative forms of bladder pain syndrome/interstitial cystitis differ in symptom intensity or response to onabotulinum toxin A?