Other research shows that synkinesis (involuntary movement of a facial muscle when another one is voluntarily moved) can become evident only 6–12 months after facial palsy appears to be resolved, as damaged nerves regrow and sometimes connect to incorrect muscles. Synkinesis is associated with corticosteroid use. In longer-term follow-up, 16–23% of Lyme facial palsies do not fully recover.In Europe, about a quarter of people with Bannwarth syndrome (Lyme radiculopathy and lymphocytic meningitis) treated with intravenous ceftriaxone for 14 days an average of 30 days after first symptoms had to be retreated 3–6 months later because of unsatisfactory clinical response or continued objective markers of infection in cerebrospinal fluid; after 12 months, 64% recovered fully, 31% had nondisabling mild or infrequent symptoms that did not require regular use of analgesics, and 5% had symptoms that were disabling or required substantial use of analgesics. The most common lingering nondisabling symptoms were headache, fatigue, altered sensation, joint pains, memory disturbances, malaise, radicular pain, sleep disturbances, muscle pains, and concentration disturbances. Lingering disabling symptoms included facial palsy and other impaired movement.Recovery from late neuroborreliosis tends to take longer and be less complete than from early neuroborreliosis, probably because of irreversible neurologic damage.About half the people with Lyme carditis progress to complete heart block, but it usually resolves in a week. Other Lyme heart conduction abnormalities resolve typically within 6 weeks.
Accidental may refer to:

Accidental (music), a symbol which changes the pitch of a note
Accidental (album), by Fred Frith
Accidental (biology), a biological phenomenon more commonly known as vagrancy
The Accidental, a 2005 novel by Ali Smith
The Accidental (band), a UK folk band
Accidental property, a philosophical term

See also
Accidence (or inflection), a modification of a word to express different grammatical categories
Accident (disambiguation)
Adventitious, which is closely related to "accidental" as used in philosophy and in biology
Random, which often is used incorrectly where accidental or adventitious would be appropriate