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JOURNAL ARTICLE
Choroid plexus hyperplasia and chromosome 9p gains.
Choroid plexus hyperplasia leading to communicating hydrocephalus is a rare disorder with only 24 patients reported so far in the literature. Furthermore, genetic information is only available for six of these cases: In one patient the condition was associated with trisomy 9p, in one patient with trisomy 9 mosaicism and in three patients with tetrasomy 9p. Here, we describe four additional patients with choroid plexus hyperplasia leading to various levels of hydrocephalus, and gain of the entire chromosome 9p region: Three with trisomy 9p and one with tetrasomy 9p. The three patients with trisomy 9p were siblings. Normal karyotypes were identified in the lymphocytes of the parents. Likely one of the parents is a mosaic for a cell line with trisomy 9p in the gonads. We demonstrate the importance of correctly diagnosing choroid plexus hyperplasia as the cause of hydrocephalus in patients with chromosome 9p gain since ventriculoperitoneal shunting is likely to fail due to intolerable formation of ascites.
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