Which finding would most clearly indicate the need for immediate medical evaluation due to potential central nervous system involvement?

Which finding would most clearly indicate the need for immediate medical evaluation due to potential central nervous system involvement?

• A. Tender cervical lymph nodes
• B. Hyperextension of the head with pain on flexion
• C. Normal pulse
• D. Mild fever

Answer: (B)

Neck stiffness with head hyperextension and pain when the head is flexed signals meningeal irritation, a hallmark of central nervous system involvement such as meningitis. This eliminates the delay in treatment because meningitis can progress rapidly and needs urgent evaluation, diagnostic testing (like a lumbar puncture when appropriate), and prompt treatment. The other findings—tender cervical lymph nodes, a normal pulse, or only a mild fever—point more toward localized infection or a non-specific illness and do not indicate CNS involvement. Therefore, the described neck stiffness with pain on flexion is the finding that most clearly triggers immediate medical evaluation.

Neck stiffness with head hyperextension and pain when the head is flexed signals meningeal irritation, a hallmark of central nervous system involvement such as meningitis. This eliminates the delay in treatment because meningitis can progress rapidly and needs urgent evaluation, diagnostic testing (like a lumbar puncture when appropriate), and prompt treatment. The other findings—tender cervical lymph nodes, a normal pulse, or only a mild fever—point more toward localized infection or a non-specific illness and do not indicate CNS involvement. Therefore, the described neck stiffness with pain on flexion is the finding that most clearly triggers immediate medical evaluation.