2022 Volume 39 Issue 4 Pages 572-577
A fifty-five-year-old Japanese woman presented with multiple small red eruptions on her trunk and extremities, which had been present for 10 years. The patient was diagnosed with breast cancer at the age of 43 years, and received chemotherapy with epirubicin, cyclophosphamide, and paclitaxel, as well as hormonal therapy following mastectomy. Physical examination revealed 36 red nodules (approximate size, 5 mm). Dermoscopy findings of glomerular vessels and a whitish network indicated poromatosis. Chest nodule biopsy revealed findings typical of poroma and confirmed the dermoscopic diagnosis of poromatosis. As no enlargement or no development of new lesions were noticed after biopsy, we kept the patient under observation and planned to excise the other lesions only if they enlarged. The reports of multiple poromas have increased in the recent years. The occurrence of multiple poromas is associated with hematopoietic tumors (such as malignant lymphoma or leukemia) in most cases and solid carcinomas in a few cases. Poroma is thought to occur on the palms and soles, but in the present case, the palms and soles lacked red nodules. We reviewed the literature on poromatosis cases, including the site of occurrence.The characteristic dermoscopic findings are useful for the diagnosis of poromas, especially in cases of multiple poromas, and as a noninvasive tool.
