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A 49-year-old female patient developed chest tightness and shortness of breath without apparent cause and presented to a local hospital. Chest radiography indicated increased thickening of the lung texture, increased multiple patchy densities in the lower lobes of the bilateral lungs and a slightly enlarged thyroid. The patient was treated for pulmonary infection with antibiotics but the symptoms persisted. A repeated CT scan revealed ground-glass attenuation of the bilateral lungs with multiple flaky exudates and visible bronchogenic signs. The symptoms did not improve after broadening anti-microbial coverage. Bronchoscopy and biopsy confirmed cryptogenic organizing pneumonia (COP). Thyroid ultrasound and thyroid function tests jointly confirmed the diagnosis of Hashimoto's thyroiditis (HT). After receiving corticosteroid treatment, the patient's condition improved and she was discharged. This case demonstrates that COP may present in combination with Hashimoto's thyroiditis (HT) and may possibly even be caused by HT. Early confirmation of diagnosis and treatment will help to improve the prognosis of such patients. [ABSTRACT FROM AUTHOR]