Evaluation of a therapeutic protocol based on the combination of photodynamic therapy and sonodynamic therapy, referred to as sonophotodynamic therapy. Since this new protocol is applied in a single day, it is called the single-visit Sono-PDT protocol. This protocol will be used for the treatment of nodular basal cell carcinoma lesions.
Inclusion Criteria: * Adults of both sexes, aged 18 years and older. * Histologically confirmed nodular basal cell carcinoma with lesion diameter ≤1.0 cm. * Participants with multiple lesions may be included, provided that each lesion meets all inclusion criteria. Exclusion Criteria: * Nodular basal cell carcinoma lesions \>1.0 cm in diameter. * Known hypersensitivity or allergy to methyl aminolevulinate (MAL) or any excipients of the study medication. * Histological subtypes of infiltrative basal cell carcinoma, including micronodular, infiltrative, sclerodermiform (morpheaform), plano-cicatricial, or terebrant subtypes. * Porphyria or other disorders of porphyrin metabolism. * Pregnant or breastfeeding women. * Women of childbearing potential not using an acceptable method of contraception. * Presence of photosensitive diseases, including lupus erythematosus. * Any condition that, in the investigator's opinion, would interfere with study participation or safety.