Glomus tumour. A 40-year-old female patient presented with painful, tender, and noncompressible swelling involving the region of distal phalanx of right index finger ((a), arrow). Ultrasonography (b) showed a well-defined, subcentimetric, hypoechoic, hypovascular soft tissue lesion (arrow). Postcontrast MRI (c) shows a small enhancing lesion along the flexor tendon sheath (arrow). Microphotograph (d) shows vascular lumina surrounded by a solid proliferation of glomus cells with perfectly round nuclei and acidophilic cytoplasm (arrow). H&E ×200.