A pаtient with uncоntrоlled diаbetes mellitus аnd ketоacidosis presents with facial swelling and black eschar in the nasal cavity. A biopsy reveals broad, sparsely septate, right-angle branching hyphae. Culture grows a mold characterized by pear-shaped sporangia with a prominent apophysis and internodal rhizoids. Which of the following is the most likely identification, and why must this result be reported immediately?