Extraocular retinoblastoma: literature review and clinical case (intracranial retinoblastoma involving the visual tracts)

Abstract

Relevance. Retinoblastoma (RB) is the most common primary intraocular tumor in children. The incidence of RB ranges from 1:14,000 to 1:20,000 newborns. To date, the survival rates of patients with RB reach almost 100 % with timely and adequate diagnosis. Among childhood oncological diseases, RB accounts for 2.3–4.5 % and 85–90 % among intraocular tumors in children. According to the volume of tumor spread, intra- and extraocular forms of the disease are distinguished. Extraocular RB is the spread of the tumor beyond the eye with invasion of the orbital tissues, as well as the possible involvement of adjacent areas, including intracranial without and with regional and/or remote metastases. The main method of treatment of children with extraocular RB is neoadjuvant chemotherapy (CT) with planning of surgical intervention and adjuvant therapy. High-dose CT (HDCT) with autologous hematopoietic stem cell transplantation (auto-HSCT), it allows to increase relapse-free survival in patients without metastatic lesions of the brain and spinal cord, but with their defeat, the prognosis of survival is extremely unfavorable, the nature of the disease is recurrent with 100 % lethality.Description of the clinical case. We report a case of bilateral RB: OD – with extraocular and intracranial spread of the tumor along the optic nerve with a lesion of the chiasm and a transition to the initial parts of the visual tracts. Secondary glaucoma. OS – with intraocular tumor growth in a 3-year-old child. After neoadjuvant chemotherapy, including intrathecal, a simultaneous two-stage operation was performed in the volume of bone-plastic (temporo-orbito-zygomatic) pterionic craniotomy on the right with prechiasmal resection of the right optic nerve and enucleation of the right eye. In the postoperative period, adjuvant chemotherapy was performed, followed by HDCT with auto-HSCT. Radiation therapy has become the final stage of treatment. Brachytherapy for OS tumor and remote radiotherapy for craniospinal region, right orbit, optic nerve stump with chiasm and pituitary pedicle were successively performed. After 14 months from the beginning of treatment and 5 months after its completion, a leptomeningeal relapse of the disease was detected.Conclusion. Rare observations of RB with damage to the visual tracts do not allow us to sufficiently study the features of the course of the tumor process, as well as to develop a single effective approach to antitumor treatment. Among the causes of mortality in patients with extraocular RB, the main one is metastasis, metastasis in the brain and spinal cord.