Retroperitoneal ancient schwannoma presenting as left flank pain and moderate unilateral hydronephrosis: A case report and literature review. - Karamat, Riyan Imtiaz; Singh, Ajeet; Anwaar, Adeel; Malik, Zaka Ullah; Hashmi, Javaid; Haseeb, Muhammad Talha; Akilimali, Aymar (Clinical Case Reports, 2024)