Prenatally diagnosed cystic neuroblastoma.

An exceedingly rare case of prenatally diagnosed cystic neuroblastoma (NB) is described. Prenatal ultrasonography at 28 weeks' gestation revealed a cystic right suprarenal mass that measured 15 x 17 mm in diameter. The mass increased parallel to fetal size until it was 41 x 44 mm in diameter at 39 weeks' gestation. Magnetic resonance imaging performed prenatally and after delivery showed two different intracystic intensities with fluid levels, suggesting intracystic hemorrhage. The patient underwent a right adrenalectomy at 20 days of age, and the resected tumor was diagnosed as a poorly-differentiated ganglioneuroblastoma. Eight months after surgery, the patient is generally healthy with no evidence of recurrence. We reviewed 25 additional cases of prenatally diagnosed adrenal cystic NB and examined the clinical features of this rare entity.