Spontaneous uterine rupture due to adenomyosis in a nongravid, nulliparous woman: A case report.

Spontaneous uterine rupture outside of pregnancy is exceptionally rare, with adenomyosis potentially acting as a structurally weakening substrate. Most reports involve gravid patients, underscoring the unusual nature of nongravid presentations. We report the case of a 26-year-old nongravid, nulliparous woman who presented with sudden, diffuse abdominal pain and hemorrhagic shock. Imaging revealed a markedly enlarged, heterogeneous uterus with hemoperitoneum. Emergency laparotomy evacuated approximately 3000 mL of blood. Multiple transmural ruptures precluded repair, necessitating total hysterectomy with adnexal preservation. Histopathology confirmed diffuse adenomyosis with extensive hemorrhagic necrosis.This case highlights that in reproductive-age women presenting with an acute abdomen, a negative pregnancy test, and an enlarged heterogeneous uterus, spontaneous rupture secondary to adenomyosis should be considered. Early resuscitation and definitive surgical management are critical, and proactive counseling is recommended for patients with severe adenomyosis who may be at risk for catastrophic decompensation.