Retrospectively, these patients will often report some difficulty in their medical or educational history. BFPP patients demonstrate mental retardation, language impairment, motor developmental delay, and seizure disorders such as epilepsy. The association of epilepsy is in approximately 50% to 85% of affected BFPP patients. The clinical manifestations of polymicrogyria are stable neurologic deficits:
In the mildest form, polymicrogyria is unilateral with only one small region of the brain involved;  neurologic problems may not be evident. In more severe forms, focal motor, sensory, visual, or cognitive problems may be present, depending on the location of the brain region affected. In the most severe forms, polymicrogyria is bilateral and generalized, resulting in severe intellectual disability, cerebral palsy, and refractory epilepsy. Individuals with the milder forms of polymicrogyria survive into adulthood, while those with the most severe forms, such as BFPP, may die at a young age as a result of such complications as seizures or pneumonia. The prevalence of isolated polymicrogyria is unknown. Researchers believe that it may be relatively common overall, although BFPP is probably rare. Radiological findings (MRI) demonstrated symmetric generalized polymicrogyria with decreasing anterior-posterior gradient, most prominent in frontoparietal cortex. Numerous gyrus on the cortex
Small gyri and sulci
Thin cortex

Methods/tests
There are different tests or methods used to determine GPR56 expression or visuals of the brain to analyze the specific sections that are affected. These tests for example, using animals such as mice, RNAi, Behavioral assay, Electron microscopy, CT scan, or MRI demonstrate different results that concludes an affected BFPP patient.
shifting the chin rest to the center of the body over the tailpiece
smoothing coarse surfaces to reduce abrasion
for males, growing a beard to avoid folliculitisSurgery is necessary for sialolithiasis, parotid tumors, and cysts. Cervical lymph nodes that are larger than 1 cm must be biopsied. Connective tissue can be removed by excision when a non-inflamed mass is large, and there is generally little recurrence. Infections should be treated conservatively, and causative species should be identified through smear and culture for appropriate antibiotic selection. Reduction of playing time may be helpful for cases without inflammation, but in 30% of cases this did not improve the symptoms. Prevalence
Fiddlers neck does not usually form unless the musician is practicing or playing for more than a few hours each day, and only seems to develop after a few years of serious playing. Thus, when not infected or otherwise problematic, fiddlers neck may be known as a benign practice mark and may be worn proudly as an indication of long hours of practice. Blum & Ritter (1990) found that 62% of 523 professional violinists and violists in West Germany experienced fiddlers neck, with the percentage among violists being higher (67%) than among violinists (59%).