Five cases of calcific tendinitis with radiographic evidence of cortical bone erosion are presented. All five cases arose at unusual sites: two at the pectoralis major insertion on the proximal humerus,two at the insertion of the gluteus maximus, and one at the insertion of the adductor magnus. Biopsy was performed in four cases and revealed areas of histiocytic infiltration, amorphous spherules of calcification, and areas of giant cell reaction extending into the cortex.To our knowledge, calcific tendinitis presenting with radiographic evidence of bone erosion has not been reported previously.

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Background: Diseases associated with coal mine dust continue to affect coal miners. Elu-

Prenatal ultrasound measurement of twin dividing membrane thickness is positively correlated with postnatal histological measurement. Dichorionicity can be determined by a magnified dividing membrane thickness ≥ 1.9 mm. Measurements with the ultrasound beam parallel to the dividing membrane may be more accurate than perpendicular measurements. Copyright © 2016 ISUOG. Published by John Wiley & Sons Ltd.