Compared with other penguin species, most blue penguins are monogamous; pair breakups are uncommon, occurring only after unsuccessful nesting attempts.
Conjoined twins are uncommon, occurring once in about every 200,000 births — and craniopagus twins are the rarest form, accounting for about 2percentt of all conjoined twins, according to the medical center.
Severe pancreatitis is uncommon, occurring in about 10% of allografts [5].
Retinal involvement is relatively uncommon, occurring in approximately 5 12% of patients.
Scapular fracture is uncommon, occurring in 3.7% of cases of blunt chest trauma.
Under those circumstances, homesickness would have been relatively uncommon, occurring only when individuals were separated from supportive, familiar people.
Endogenous Nocardia endophthalmitis is more uncommon, occurring in immunocompromised patients as the result of hematogenous dissemination, usually from a primary pulmonary focus [4 6].
Laryngotracheal penetrating injury is relatively uncommon, occurring in 1 7 % of patients and with cervical tracheal trauma prevailing [27, 39, 43, 44, 45, 46].
Pineal metastasis is uncommon, occurring in 0.4 3.8 % of patients with solid tumours as seen on autopsy reports and in 5 % of patients referred to surgical management of pineal tumours [27, 28].
By comparison, metastatic disease to the spleen is uncommon, occurring in 1% of advanced visceral malignancy [5] and so UCAs do not have a practical role in screening the spleen in patients with visceral tumours.
