Rhino-entomophthoromycosis is a granulomatous lesion of the upper respiratory tract caused by a Phycomycete Entomophthora coronata (Costantin Kevorkian, 1935). The condition was initially described in Nigeria by Martinson in 1963 (1) under the designation of rhinophy-comycosis on the basis of its histological resemblance to subcutaneous phycomy-cosis but its somewhat different clinical behavior. Subsequently, in six further cases from the same hospital, the etiologic agent, E. coronata, was isolated (2). This paper analyses the radiological features found in 14 patients with this disease who were studied at the University College Hospital, Ibadan, in Western Nigeria. Pathology The mode of infection is probably traumatic implantation of the fungus or inhalation of spores, which germinate and produce infection when local conditions are suitable. A granulomatous lesion commences in the submucosa usually in or close to the anterior end of the inferior turbinate. This inflammatory process may then extend into the nasal cavity to cause nasal obstruction; invade the paranasal sinuses, filling them with submucosal masses; or spread on to the face by way of naturally occurring bony foraminae or spaces between two adjacent bones while remaining below the facial muscles, though these may become invaded in long-standing cases. This mode of extension gives rise to firm facial swellings over the nose which may progressively spread to the cheek and upper lip (Fig. 1). The swellings are firm with palpably discrete borders and are fixed to deeper tissues, but in rhino-entomophthoromycosis, unlike subcutaneous phycomycosis, the overlying skin is moveable over the swellings unless there is secondary infection or invasion of the facial muscles has occurred. The condition differs further from subcutaneous phycomycosis in that its downward spread is limited outward to the lateral border of the facial muscles of expression and downward to the upper lip. Histological examination of the affected tissue has disclosed a similar appearance in all cases. There is a chronic granulomatous reaction in which eosinophils are prominent and giant cells containing hyphae and lying in microabscesses may be seen; the degree of fibrosis varies with the age and maturity of the portion of the lesion examined. Large, nonseptate hyphal elements surrounded by eosinophilic material are demonstrated by periodic acid Schiff stain (Fig.2). Clinical Features All the patients were adults who were well nourished and fit, apart from their fungal infection. None of the patients had any evidence of systemic upset, anemia, or diabetes. The age range was between twenty and forty years, and 12 of the 14 patients were males. All patients had varying degrees of unilateral nasal obstruction, but none had fetor. There was a swelling over the nose, cheek, or upper lip in 13 of the cases; in the fourteenth the lesion was confined to the nasal cavity and there was no external swelling.