A 59-year-old male patient reported hoarseness with swelling in the left cervical region for about 6 months. Underwent cervical exploration, complete resection of the lesion and total laryngectomy due to infiltrative lesion affecting the left hemilarynx and soft tissues whose anatomopathological study revealed localized malignant neoplasia. During the oncologic follow-up, a new staging was performed by thoracic CT, which revealed a scleral nodular lesion in the right lateral region of the sternum body and then a ¹³¹I-MIBG full body scan with fusion images (SPECT/CT), according to images presented.
Whole-Body investigation with ¹³¹I-MIBG-labelled metaiodobenzylguanidine (¹³¹I-MIBG) after 24 and 48 hours after administration of 118.4MBq/3,2 mCi of ¹³¹Iodine-MIBG.
Additional images of ¹³¹I-MIBG SPECT/CT of the thorax.

Question:
Based on the clinical history and specificity of the ¹³¹I-MIBG study, what is the most likely diagnosis?

(Medical Residency Examinations - HUAP UFF 2014) Methylbenzylguanidine scintigraphy may be useful in the preoperative localization of: