Acute rectal calcinosis following parathyroidectomy in a patient with primary hyperparathyroidism and preoperative hypercalcaemic crisis

Severe hypercalcaemia can lead to visceral calcifications, ischaemic changes, and gastrointestinal complications, even if not initially evident. In patients with primary hyperparathyroidism, acute rectal bleeding following parathyroidectomy may indicate a rare cause such as rectal calcinosis and should be considered in the differential diagnosis. Calcinosis should be particularly suspected in cases with a severe clinical picture of hyperparathyroidism-related hypercalcaemia (e.g. severe weight loss, lack of calcium correction after standard therapy). Early diagnosis and conservative management can result in favourable outcomes without the need for invasive treatment.