Background/Aims: Although the hepatobiliary manifestations of Mycoplasma pneumoniae infection have been described in several previous studies, controversies still remain. The aim of this study was to evaluate the clinical characteristics of patients with M. pneumoniae-related hepatitis and compare to those with M. pneumoniae infection but not hepatitis. Methods: We reviewed the medical chart of patients diagnosed with M. pneumoniae infection serologically. Results: Among the 117 patients with M. pneumoniae infection enrolled in the study, 25 showed acute hepatitis without any evidence of another cause. Patients with hepatitis presented with prodromal symptoms more frequently and also had a higher body temperature and C-reactive protein (CRP) levels than patients without hepatitis. Frequencies of respiratory tract involvement were not different between two groups. Clinical signs recovered within three weeks in both groups following the institution of antibiotic therapy. Multivariate analysis revealed that male sex, age <40 years, and high CRP levels were significantly linked to M. pneumoniae-related hepatitis. Conclusions: We found that acute hepatitis associated with M. pneumoniae occurred in about 21% of all M. pneumoniae infections, and gender, age, and CRP levels were factors related to the occurrence of M. pneumoniae-related hepatitis.

Cowden's disease, also known as a kind of phosphatase and tensin homolog (PTEN) hamartoma tumor syndrome, is an uncommon autosomal dominant inherited complex disorder with various hamartomatous growths of multiple organs involving all three germ cell layers. It usually manifests with polyps throughout the gastrointestinal tract, ranging anywhere from 30% to 85%, and more common extra intestinal findings. Mucocutaneous lesions like facial trichilemmomas, acral keratoses, papillomatous papules and macrocephaly, and malignancies including breast, thyroid and endometrial carcinoma are the hallmark of the disease. Here we report on familial Cowden's diseases case of a 52-year-old male proband with mucocutaneous lesions and mutation on the PTEN gene obtained by extrapolating from gastrointestinal polyposis as a starter and his daughter who developed thyroid cancer.

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