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A Case of Amyoplasia in a Monochorionic Twin Pregnancy: A Sequela from Twin-Twin Transfusion Syndrome?

Objective: To present and discuss the sonographic and clinical findings in one twin of a monochorionic pair affected by amyoplasia. Methods: On ultrasound examination at 21 weeks in a monochorionic twin pregnancy, twin I was smaller, hydropic, with multiple contractures consistent with amyoplasia and oligohydramnios. Twin II was anatomically normal with polyhydramnios. Results: The twins were delivered at 28 weeks’ gestation. The clinical findings were consistent with twin-twin transfusion syndrome (TTTS). Conclusion: It is postulated that TTTS may be a causative factor in the excessive incidence of amyoplasia in monozygotic twin pregnancy.