Exception to the Puppe's rule reloaded and a warning in the interpretation of skull fractures: they run even through recent craniotomy burr holes.

A possible "exception" to Puppe's rule regarding the intersection of skull fractures has been previously addressed due to the observation that skull fractures can pass through old and remodeled craniotomies. In a further case presented herein, however, it was shown that cranial fractures are also able to pass through recent burr holes, a phenomenon never previously described. A 63-year-old man sustained a self-inflicted gunshot wound to the right temple region, with an exit wound in the left temporal region. Twenty-five days prior, the patient had undergone parietal craniotomy for the evacuation of a subdural hematoma secondary to glioblastoma. Among the fracture lines originating from the exit wound, one traversed the craniotomy hole, terminating approximately 1.4 cm beyond its contralateral margin. This illustrates that cranial fractures possess the capability to cross "fresh" burr holes that have not undergone to bone remodeling. Consequently, the evaluation of Puppe's rule should be reconsidered, particularly in cases of gunshot injuries, wherein fractures pass through full-thickness circular lesions (such as entry and exit wounds). The varied scenarios underscore the potential for fractures to "pass through" these burr holes if they have not themselves generated fracture lines, as may be the case with entry holes with circular lesions without fractures.

Characteristics of skin injuries caused by power drill.

Skin injuries caused by power drills have been rarely reported. A case is described of a 51-year-old woman who was found dead on a motorway after committing suicide by jumping from a bridge. The body showed a total of nine circular/oval penetrating injuries of the chest and abdomen with very regular, smooth margins, and particular features due to the presence of "skin islands" inside the lesion and "short radial linear abrasions" around the margins. These injuries were caused by a power drill, which was later found in the woman's apartment. For comparison, experimental tests were carried out with the same drill and different bits on pig skin, whose appearance resembled those found on the body. Especially skin islands were also reproduced in the experimental tests. The presented case shows the possibility of this rare method of suicide (or suicide attempt) and the typical characteristics of such peculiar skin lesions that pose problems of differential diagnosis with other injuries such as gunshot injuries.

Fatal injuries due to direct helicopter propeller strike.

During a helicopter exercise, due to the scarce visibility caused by the presence of snow, a collision between a landing helicopter and one already on the ground occurred. The 40-year-old pilot of the already landed aircraft was killed as a result of a direct propeller impact in the right side of the pilot's cockpit, while the co-pilot remained uninjured. At autopsy, the macroscopic characteristic findings in the form of cut injuries and amputations along the axis of the rotor blade impact as well as a 3D reconstruction through CT-Scan were analyzed and discussed for a thorough reconstruction of the injuries and the dynamics.