Placental Mesenchymal Dysplasia and Fetal Hematologic DisorderKoga, Hiroshi MD*; Makimura, Mika MD, PhD*; Tanaka, Hiromasa MD, PhD†; Sumioki, Hisao MD, PhD†Journal of Pediatric Hematology/Oncology: August 2014 - Volume 36 - Issue 6 - p e389–e391 doi: 10.1097/MPH.0b013e31829d4542 Online Articles: Clinical and Laboratory Observations Abstract Author Information Placental mesenchymal dysplasia (PMD) is a rare, recently recognized placental vascular anomaly. About 20% of patients with this placental anomaly have Beckwith-Wiedemann syndrome. We report a case of a phenotypically normal neonate with anemia and thrombocytopenia associated with PMD. Histologic examination of the placenta showed findings consistent with PMD, including chorangioma. The patient’s hematologic abnormalities resolved during the week following birth. Normal phenotypic fetuses with PMD seem to exhibit hematologic disorders at birth in some cases, especially in the presence of chorangioma. Departments of *Pediatrics †Obstetrics and Gynecology, National Hospital Organization Beppu Medical Center, Oita, Japan The authors declare no conflict of interest. Reprints: Hiroshi Koga, MD, Department of Pediatrics, National Hospital Organization Beppu Medical Center, 1473 Oaza-Uchikamado, Beppu, Oita 874-0011, Japan (e-mail: firstname.lastname@example.org). Received January 31, 2013 Accepted March 27, 2013 © 2014 by Lippincott Williams & Wilkins.