Year : 2007 | Volume
: 6 | Issue : 3 | Page : 128--129
Foetal chondrodysplasia: Intrauterine diagnosis
AG Adesiyun1, A Eka2, MOA Samaila3,
1 Department of Obstetrics and Gyanecology, Ahmadu Bello University Teaching Hospital, Shika-Zaria, Kaduna State, Nigeria
2 Department of Radiology, Ahmadu Bello University Teaching Hospital, Shika-Zaria, Kaduna State, Nigeria
3 Department of Pathology, Ahmadu Bello University Teaching Hospital, Shika-Zaria, Kaduna State, Nigeria
A G Adesiyun
P. O. Box 204, Kaduna, Kaduna State
Chondrodysplasias are rare occurrence. We present a case of short-limbed chondrodyplasia diagnosed in a 22 week fetus of a 28 year old. She was para 4+0 with two children alive. She had similar occurrences in her last two pregnancies. The index pregnancy and the last two eventful pregnancies were preceded with ingestion of trado-herbal drug to treat subfertility.
|How to cite this article:|
Adesiyun A G, Eka A, Samaila M. Foetal chondrodysplasia: Intrauterine diagnosis.Ann Afr Med 2007;6:128-129
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Adesiyun A G, Eka A, Samaila M. Foetal chondrodysplasia: Intrauterine diagnosis. Ann Afr Med [serial online] 2007 [cited 2021 Nov 27 ];6:128-129
Available from: https://www.annalsafrmed.org/text.asp?2007/6/3/128/55720
Chondrodysplasias refer to a group of disorders that affect skeletal development and growth. There are more than a hundred distinct entities of which achondroplasia is the commonest.  They result from gene mutation of 'chondrodysplasia genes' that are essential for skeletal and growth development.  This is a report of short-limbed foetal chondrodysplasia diagnosed at booking for antenatal care. .
She was a 28 year old para 4+0 housewife. The last two deliveries were stillborn at twenty eight and thirty weeks respectively. Both stillborns were noticed to have short upper and lower limbs. There was no family history of similar disorder. She took trado-herbal drugs daily for months to treat subfertility before the index pregnancy and the last two pregnancies that ended in stillbirths.
She registered for antenatal care at twenty weeks of gestation. Biochemical and hematological test did not reveal abnormal data. Obstetric sonography however showed a live foetus at twenty two weeks with marked shortening of both humerus and femur [Figure 1]and [Figure 2], there was also polyhydramnios. The sonographic humeral length was 11cm and femoral length was 14cm, against the 5th percentile reference value of 28cm and 29cm for the humerus and femur respectively at 22 weeks gestation. She was counseled, but desired to continue with the pregnancy.
She presented at 30 weeks gestation with intrauterine foetal death. Labour was induced and a female stillbirth (weight 1.2kg) delivered, with features of chondrodysplasia [Figure 3]. The couple was appropriately counseled before discharge from the hospital.
Chondrodysplasias manifest with either predominant short-limbed or short trunk abnormalities.  Though the manifestation is usually dominated by skeletal abnormalities, involvements of non-skeletal tissues such as congenital heart defect, cataract, retinal detachment, intestinal atresia, renal cyst and genital hypoplasia are not uncommon.  The disorder may be lethal or non-lethal. The lethal type results in intra-uterine foetal death or still-birth; this may be the type our patient had in view of the three successive intra-uterine deaths of short-limbed fetuses.
The disproportionate skeletal manifestation of this disorder distinguishes chondrodyplasia from other causes of short stature such as mucopolysaccharidoses, mucolipidoses and some form of osteogenesis imperfect.  Antenatal diagnosis, which our patient benefited from, is based on ultrasonographic discrepancy between the gestational age and the length of the long bones. Diagnostic accuracy can be enhanced by using 3-D ultrasonography alone or with intrauterine 3-D helical computerized tomography. , In a high risk pregnancy, molecular genetic testing of foetal DNA obtained by aminocentesis or chorionic villus sampling at 15-18 weeks and 8-11 weeks gestation respectively may be done. ,
In non-lethal forms of chondrodysplasia, radiology will reveal the segment of the long bone with greatest shortening which maybe rhizomelic, mesomelic or acromelic for proximal, middle and distal segment shortening respectively.
Management of the affected baby should be tailored to the specific disorder. This includes genetic testing/counseling, prevention/correction of skeletal deformities and treatment of non-skeletal complications.  Growth hormone therapy in pharmacologic doses and surgical limb lengthening procedure have been proposed. ,
In this case report, although of borderline significance is the linkage of trado-herbal drug ingestion to the pathogenesis of chondrodysplasia because the fact is not well established. However, with increasing patronage of alternative (unorthodox) medical practice in some lesser developed countries, conscious effort should be directed towards finding the mutagenic and teratogenic profile of herbal drugs before they are registered for public use.
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