Painless Groin Lymph Node Swelling.

My grandmother is 72 years old and has painless external swelling/lumps near the groin/private-part area. She is otherwise normal, but she gets anxious and her BP increases during hospital visits. We consulted a gynecologist and general physician. Ultrasound report mentions bilateral inguinal nodal mass lesions and suprapubic lymph nodes, largest around 33 × 30 mm, with loss of fatty hilum and increased vascularity on Doppler. Impression says morphology is indeterminate/sonographically suspicious: lymphomatous / metastatic / granulomatous lymphadenitis. Report advised FNAC/core/excision biopsy and MRI pelvis with contrast. Please advise which specialist we should consult first: gynecologic oncologist, surgical oncologist, medical oncologist, or general surgeon? Also, should we proceed with FNAC/core biopsy first, or MRI pelvis with contrast first?