Primrose syndrome consists of cognitive and motor delay, characteristic facial dysmorphism with enlarged and calcified external ears, cataracts, hearing impairment, spastic paraparesis with joint contractures, and distal muscle wasting. To our knowledge, only 5 cases have been reported in the literature.1–5 We report the sixth case and only the second woman to fulfill all clinical elements of Primrose syndrome, who, in addition, manifested motor tics, hand stereotypies, and self-flagellating behaviors. This patient remained undiagnosed for over 4 decades.
A 43-year-old woman, the product of a normal vaginal delivery and negative neurologic family history, was born with congenital heart disease (Ebstein malformation, mitral valve prolapse), congenital hip dysplasia, and agenesis of the corpus callosum. In early childhood, she was found to have hearing impairment, cataracts, a nondescript neoplasm of the bone in the palate, ossification of cartilage, cystic changes in bones, diabetes mellitus, and hypothyroidism. Walking began at the age of 6 years. The limited repertoire of her language included “mommy,” “daddy,” “bye-bye,” and “go to school,” before she lost vocalization altogether in her late 30s. She attended special education for about 18 years and worked at putting bakery projects together for several years thereafter. She had been able to run and roller skate before her gait deteriorated. She slowly lost the ability to ambulate independently. At age 35, she started using a walker, and by age 40 needed a wheelchair for most transportation needs. On examination, at 42 years, her facial dysmorphic features included micrognathia, repaired cleft palate, anteverted nares, prominent ears and nasal root, ptosis, and microphthalmia (figure, A). Review of prior family photographs revealed prognathism (instead of micrognathia), repaired cleft palate, anteverted nares, and prominent ears and nasal roots. On examination, her head circumference was 55 cm. She had spastic paraparesis with leg scissoring and contractures. Muscle stretch reflexes were absent. Associated movements included motor tics, hand stereotypies, and self-flagellating behaviors (see video on the Neurology® Web site at www.neurology.org). For the last 2 years, she has become unable to stand and bear weight without assistance. She is now mute, mumbling incomprehensible sounds, incontinent of urine and stools, having frequent painful spasms, and wheelchair-dependent.
Her brain MRI revealed agenesis of the corpus callosum and partial calcification of the basal ganglia (figure, B–G). EEG was normal. Laboratory investigations showed increases in serum calcitonin (8 pg/mL, normal = 0.0–4.6 pg/mL) and phosphate (4.6 mg/dL, normal = 2.5–4.5 mg/dL).6
Since there is no known molecular cause for Primrose syndrome, we searched for a small duplication or deletion by expanded microarray analysis, using the Infinium Assay with the Illumina HumanCNV370-duo DNA Analysis BeadChip platform. Data from this SNP bead array analysis detected a small deletion on chromosome 11, and defined the region of deletion to be approximately 225.5 kb between markers rs12275693–>rs1442927 (linear position on chromosome 11 is approximately 26971983–27197527). The only annotated gene in this region is BBOX1, involved in carnitine biosynthesis. The deletion was not present in a maternal sample, but a paternal sample was not available.
The combination of a neural tube congenital malformation (corpus callosum agenesis), facial dysmorphism (micrognathia, repaired cleft palate, anteverted nares, prominent ears and nasal root, ptosis, and microphthalmia), deafness, cataracts, congenital heart disease (mitral valve prolapse, Ebstein malformation), diabetes, and premature degenerative joint disease are classic constituents of Primrose syndrome. The calcified enlargement of the external ears was the telltale sign, which along with basal ganglia calcification and known skeletal cystic changes suggest an underlying disorder in calcium homeostasis, supported by the increased serum calcitonin in our patient. Motor tics, hand stereotypies, and self-flagellating behaviors are novel elements to the phenotype. However, the deletion identified in chromosome 11 may not have any relevance to the phenotype and may be a benign copy number variant. Additional effort to identify a genetic cause will require study of additional patients using evolving genetic tools.
The prior 5 cases reported, including Primrose's original description in 1982, are summarized in table e-1 on the Neurology® Web site at www.neurology.org. Long-term historical information is only available for the individual reported by one of the authors (N.M.L.) in 1996, who also had schizophrenia. He became progressively stiffer and had increasing difficulty moving at all. His hands became clenched fists. He had progressive difficulty swallowing food and secretions and required a feeding tube. He was admitted to the hospital with abdominal distention and pain and died of his illness at age 45. No autopsy was performed.
Movement disorders have been reported in Primrose syndrome in the form of parkinsonism (masked facies, low-amplitude tremor)3 and ataxia.4 Our case adds tics, stereotypes, and self-flagellation to the phenotypic spectrum. Primrose syndrome may be added to the growing list of secondary tics and stereotypies, which includes drug-induced (amphetamines, pemoline, cocaine, neuroleptics), encephalitis, schizophrenia, and neurodegenerative diseases.6,7