Supplemental Material for: Pelvic Schwannoma Mimicking an Adnexal Mass: A Case Report

Pelvic schwannomas are rare and may create diagnostic difficulty because their clinical and radiological features are nonspecific and may mimic adnexal masses, particularly in female patients.</p><p dir="ltr">Case Presentation: A 19-year-old female patient was evaluated for left hip pain persisting for six months.

Pelvic magnetic resonance imaging revealed a well-circumscribed cystic mass measuring approximately 9 x 9.5 cm in the left adnexal region, and an adnexal mass was considered in the initial differential diagnosis. Surgical exploration through median laparotomy demonstrated normal uterus and bilateral ovaries, whereas the mass originated from the left pelvic retroperitoneal space and showed close anatomical relationship with the sacral region.