Compressive radial neuropathy, a type of nerve entrapment, can cause pain, extensor weakness, and sensory change. Usually, clinicians draw a distinction between posterior interoposterior interosseous nerve (PIN) syndrome in which weak extensor function is the main symptom, and radial tunnel syndrome (RTS), which causes pain but not motor weakness. Here, we present a case of a 55-year-old patient who experienced pain and tenderness in his right forearm, followed by extensor weakness, leading to finger and wrist drop. After undergoing surgical intervention, the patient showed improvement in both pain and motor weakness. This report indicates that clinical diagnosis should focus on clinical presentation before distinguishment as PIN syndrome or RTS. We suggest surgical intervention as an effective treatment for entrapment symptoms.