Bladder rupture in the absence of trauma (spontaneous bladder rupture) is a rare but life-threatening phenomenon, commonly associated with pelvic malignancy1,2 and postvaginal delivery.3 In children, case reports of spontaneous bladder rupture are most often idiopathic or associated with congenital genitourinary malformations (e.g., posterior urethral valve) and bladder augmentation surgery.4 Since bladder rupture often presents with acute abdominal pain, the diagnosis can be missed, leading to delayed treatment and poor outcomes. Here, we describe the second case in the literature, to our knowledge, of spontaneous bladder rupture in a pediatric patient with prior bladder rhabdomyosarcoma.