Abstract: Tubo-ovarian abscess (TOA) is one of the most serious pelvic inflammatory diseases in women. The early manifestation of the disease is fever. With the progress of the disease, it gradually evolves into acute abdomen. The severity of clinical manifestations in patients with hypothyroidism depends on the duration and severity of thyroid hormone deficiency. Severe patients may suffer from chronic diseases such as emotional and cognitive impairment, cardiac enlargement, intestinal obstruction, malignant anemia, coelomic effusion and metabolic disorders. When TOA and hypothyroidism occur together in a patient, it is easy to be misdiagnosed as the advanced ovarian malignant tumor. In this paper, we report a case of TOA combined with hypothyroidism that was misdiagnosed as malignant ovarian tumor, in order to improve the understanding, diagnosis and treatment of this complex disease.

Key words: Abscess, Fallopian tubes diseases, Ovarian diseases, Hypothyroidism, Ovarian neoplasms, Diagnosis, Case report