Abstract
BACKGROUND: Acanthosis nigricans (AN), Leser-Trélat sign, and tripe palm are all skin diseases. To date, reports of these appearing as a paraneoplastic syndrome in a gastric cancer patient are quite rare. CASE SUMMARY: We report the case of a 61-year-old man with darkened skin color in the face and torso with no obvious inducement after 1 year of treatment for Riehl's melanosis. He had 40 brown maculopapular eruptions on his face and the top of his head with obvious itching. Papillary wart-like hyperkeratosis with dark brown pigmentation was also observed on both sides of the areola. He had papilloma-like lesions on the face, around the orbit, and on the neck. His bilateral palms had small, smooth, papillary projections with millet-like appearance. Histopathological examination of the skin showed that the patient was suffering from AN, tripe palms, and Leser-Trélat sign. Gastroscopy showed the patient's cardia was affected, and pathological biopsy revealed that he had moderate-to-poorly differentiated adenocarcinoma. Computed tomography test results showed that his cardia wall had thickened. Based on these histological and skin characteristics, the patient was diagnosed with gastric cancer with AN, tripe palms, and Leser-Trélat sign. CONCLUSION: Researchers should follow up on patients with malignant AN, Leser-Trélat sign, and tripe palms.