RESUMO
By definition, the term "collision lesion" refers to two or more tumors coinciding in the same anatomic position or visceral organ. Collision lesions coexisting on the same skin location are defined as collision skin lesions (CSLs). Although this term implies a conflict between the tumors, this is not the case. CSLs appear to be rare, but still pose a significant diagnostic problem in everyday clinical practice and clinicians should be aware of their existence. The aim of this study was to elucidate the problem of CSLs in clinical practice, with an emphasis on classification of CSLs according to position dependence, tumor histogenesis, etiology, and possible lesion combinations in CSLs, as well as diagnostic possibilities. According to our results, accurate clinical diagnosis could be only rarely reached, requiring lesion excision and pathohistological confirmation of CSLs. Considering the fact that tumors in CSLs can be partially or completely overlying or can even be positioned one within the other, the existence of two or more tumors is extremely difficult to detect.
RESUMO
The aim of this study was to evaluate the presence of spores and/or hyphae in benign cutaneous tumors (CT) and compare their presence in malignant cutaneous tumors. In this cross-sectional study we evaluated 328 CTs positive for spores and/or hyphae. The results show that the greatest number of involved CTs which contained spores and/or hyphae were found in compound nevi 181 (55.18%) and seborrheic warts 61 (18.60%). No spores and/or hyphae were observed in the melanoma samples, and a very low prevalence was found in squamous cell carcinomas (SCCs) (2; 0.61%) and basal cell carcinoma (BCC) (1; 0.30%). The presence of spores and/or hyphae could be a good indicator for non-malignancy, allowing differential diagnosis between benign CTs and SCCs or BCCs as well as between melanoma and nevi.