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mri ct disorder scan disease trauma paranasal sinus x-ray mouth face oral parotid face muscles gland submendibular maxilla degenerative radiology headach cancer infection tumour pns xray nose scrotal scrotal ultrasound scrotal anatomy scrotal trauma non healing ulcer leg ulcer leg lower limb venous ulcer vein varicose healing fracture healing fracture hiv drugs drugs prophylaxics exposure prophylaxics hiv grading classification extrusion baashtrap spinal facet spinous stenosis osteophyte spine disc bulge disc protrusion vertebra scrotum