A 10-year-old male miniature dachshund dog was referred to our hospi tal for cough and dyspnea. Two-dimensional echocardiography revealed pulmonary hypertension with an echo-free circle structure adjacent to the dorsal side of the left atrium. The estimated systolic and mean pul monary arterial pressures were 50. https://www.mojozers.shop/product-category/home-slider-1/