article_snippet.sent: The sisters were both born with neurofibromatosis type 1 (NF1) - a condition that causes café au lait spots (flat brown birthmarks) on the skin, freckles in unusual places, and benign lumps and bumps.
article_snippet.sent: However, it is unclear whether the NF1 is related to The sisters growths, and they say they have been told there probably is no link.
article_snippet.sent: The sisters were born with neurofibromatosis type 1 - a condition that causes benign lumps and bumps, although The sisters do not know if it is related to The sisters development of brain tumours .
article_snippet.sent: The sisters has been told The sisters tumour is not cancerous, and is classed as Grade 1, the lowest risk.
article_snippet.sent: However, The sisters mother, Sharon Johnson, 47, is worried her tumour could grow and endanger The sisters health.
article_snippet.sent: Mrs Johnson said: 'First of all they said they would take it out, but then they did a biopsy and found a biopsy wasn't cancerous, so they have decided to monitor for the next few months. '