Fig. 2From: Atypical ultrasound features of parathyroid tumours may bear a relationship to their clinical and biochemical presentationa Neck ultrasonography of a 21-year-old female patient with primary hyperthyroidism showed haemorrhagic and cystic degeneration in the right superior parathyroid adenoma. b Low-power photomicrograph (×50, H&E stain) shows an encapsulated tumour composed of lobules of polygonal cells in keeping with parathyroid adenoma with interspersed thin-walled congested blood vessels (short arrows), areas of haemorrhage (*) and cystic degenerationBack to article page