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For Johns Hopkins University Department of Neurosurgery in 2022-2026, the graph shows 61 visible PIs and 361 internal PI collaborations. The main research signal is Medicine as the leading field (55% of slots across 58 PIs; 58 labels), Surgery as the leading subfield (12% of slots across 19 PIs; 19 labels), and Spinal Fractures and Fixation Techniques as the leading topic (6% of slots across 10 PIs; 10 labels). That is a healthy pattern, with enough links to reveal several interpretable groups rather than one undifferentiated component. The most prominent PIs by weighted works are Risheng Xu (50.5 weighted works; Neurosurgical Procedures and Complications, Trigeminal Neuralgia and Treatments). The clearest collaboration lines are Risheng Xu and Judy Huang (79 shared works, weight 31.3). The strongest breakdown groups are group 1 with 10 PIs, 12 internal connections, weight 169.7, around Neurology, Genetics, Epidemiology, led by Risheng Xu, Debraj Mukherjee, Chetan Bettegowda; group 2 with 9 PIs, 8 internal connections, weight 88.3, around Surgery, Pathology and Forensic Medicine, Genetics, led by Nicholas Theodore, Daniel Lubelski, Betty Tyler.