[Two patients with renal medullary hyperechogenicity].

History And Admission Findings: We report two patients with medullary nephrocalcinosis and nephrolithiasis. The first patients had unspecific symptoms of a systemic inflammatory disease, the second patient was asymptomatic.

Investigations: Both patients had normocalcemia and normal parathyroid hormone levels, very high 1,25(OH)(2)-vitamin D and normal to low 25-OH-vitamin D levels.

[Hypothyroidism due to pseudo-malabsorption of levothyroxine--Case 12/2009].

Background: Hypothyroidism is a common endocrine disorder which is easily treatable by an appropriate thyroid hormone replacement therapy in the majority of patients. In some patients, hypothyroidism is refractory to oral levothyroxine substitution. Common causes of lack of response to levothyroxine replacement comprise non-compliance and impaired absorption.