Aplasia cutis congenita (ACC) is a rare malformation characterized by the localized absence of skin, which may extend through the underlying tissues to the musculature and bone.1 Aplasia cutis congenita associated with fetus papyraceus is classified as type V ACC. 2 We present a case of type V ACC with extensive truncal lesions. Ultrasonic examination has become a conventional method in prenatal diagnosis. Many congenital malformations can be detected by ultrasound (US). Abnormalities in the structure of the abdominal wall can be detected in prenatal US examination. In the normal fetus, the abdominal skin surrounding the trunk generates strong echoes on US. In the present case, strong echoes were unobtainable for part of the abdomen.
Case reportA 28-year-old woman (gravida 3, para 1, abortus 1) presented for US examination at 13 and 32 weeks of gestation. At 13 weeks of gestation, US showed a twin pregnancy with one death. At 32 weeks, US examination displayed only one fetus. The surviving fetus was smaller than expected for the post-menstrual period. Measurements calculated in US indicated a fetus at 28 weeks of gestation. When we examined the trunk, sagittal and cross-sectional US scans demonstrated that the abdominal skin was absent. In a normal fetus, the skin surrounding the trunk generates strong echoes. In the present case, strong echoes were absent for some of the abdominal circumference. The liver appeared to be exposed. No strong echo was generated between the liver and amniotic fluid. We designated this US characteristic as indicating absence of skin (Fig. 1). The positions and shapes of intra-abdominal organs were normal. No other structural abnormality was found. We excluded gastroschisis, omphalocele and Prune belly syndrome. Ultrasonic diagnosis indicated that: (i) fetal intrauterine growth was retarded, and (ii) fetal abdominal skin was absent.The patient was delivered vaginally at term with a macroscopically normal placenta. Apgar scores were 10 and 10 at one minute and five minutes, respectively. The infant was male and weighed 1850 g. A 95 9 45 9 10-mm fetus papyraceus was also delivered.